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Engine Controls - Trouble Shooting - No Codes - 2.2L: Other Pontiac Sunfire I

Testing & Diagnostics ~6137 words

Intermittent

Test the vehicle under the same conditions that the customer reported to verify the system is operating as designed.

Go to the symptom diagnostic procedure from the following list to diagnose the symptom

  1. Exhaust hissing noise. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) .
  2. Exhaust popping noise. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) .
  3. Exhaust rattle noise. Go to «EXHAUST NOISE»(ref-153405-S06883434362003051300000) .
  4. Loud exhaust noise. Go to «EXHAUST NOISE»(ref-153405-S06883434362003051300000) .
  5. Exhaust buzz, groan, hum noise. Go to «EXHAUST NOISE»(ref-153405-S06883434362003051300000) .
  6. Loss of power. Go to «RESTRICTED EXHAUST»(ref-153405-S10795551862003051300000) .
  7. Poor acceleration. Go to «RESTRICTED EXHAUST»(ref-153405-S10795551862003051300000) .
  8. Poor fuel economy. Go to «RESTRICTED EXHAUST»(ref-153405-S10795551862003051300000) .

Fuel System

  1. Test for incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTICS PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  2. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Test the fuel injectors. Go to «FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL»(ref-153404-S30411575462003040400000) , «FUEL INJECTOR BALANCE TEST WITH TECH 2»(ref-153404-S27079648652003052700000) , or «FUEL INJECTOR COIL TEST WITH SPECIAL TOOL»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Verify that each injector harness is connected to the correct injector or cylinder. Relocate injector harnesses as necessary.

Sensor/System

  1. Check the air intake system and crankcase for air leaks.
  2. Check the crankcase ventilation system for proper operation.
  3. Use a scan tool to monitor the Knock Sensor (KS) system for excessive spark retard activity.

Ignition System

  1. To properly check the spark plugs or to correct a condition, refer to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes, heavy deposits and verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) module for proper ground connection.
  8. Monitor the MISFIRE CURRENT COUNTERS while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedures for diagnosis. Go to «DTC P0300: ENGINE MISFIRE DETECTED»(ref-153397-S37036522042003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.

Engine Mechanical

  1. Check engine mechanical for the following conditions: Compression. Sticking or leaking valves. Worn camshaft lobes. Valve timing. Worn rocker arms. Broken valve springs. Excessive oil in combustion chamber or leaking valve seals. For more information, go to appropriate article in ENGINES.
  2. Check for incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. in appropriate article in ENGINES.
  3. Go to appropriate article in ENGINES for diagnosis procedures.
  1. Test the fuel injectors. Go to «FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL»(ref-153404-S30411575462003040400000) , «FUEL INJECTOR BALANCE TEST WITH TECH 2»(ref-153404-S27079648652003052700000) , or «FUEL INJECTOR COIL TEST»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  2. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Test for incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTICS PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Check for fuel in the fuel pressure regulator vacuum hose. If fuel is found in the hose replace the fuel pressure regulator.
  5. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  6. Check for the following conditions that may cause the engine to run rich: Any water intrusion in the HO2S connector. The engine oil contaminated by fuel. An EVAP canister purge condition. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. A leaking fuel pressure regulator. Any leaking fuel injectors. Any vacuum hoses that are split, kinked, or improperly connected. An air intake duct that is collapsed or restricted. An air filter that is dirty or restricted.
  7. Check for the following conditions that may cause the engine to run lean: Any water intrusion in the HO2S connector. An exhaust leak between the HO2S and the engine. Any vacuum leaks. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any restricted fuel injectors. Fuel contamination. Any vacuum hoses that are split, kinked, or improperly connected.
  8. Use a scan tool to monitor the Knock Sensor (KS) system for excessive spark retard activity.
  9. Check for throttle body tampering, excessive deposits, or damage.
  10. Check the Throttle Position (TP) sensor and related circuits.
  11. Check the crankcase ventilation system for proper operation.
  1. To properly check the spark plugs or to correct a condition, refer to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes, heavy deposits and verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) for proper ground connection.
  8. Monitor the Misfire Current Counters while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedure for diagnosis. Go to «DTC P0300: ENGINE MISFIRE DETECTED»(ref-153397-S37036522042003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  1. Check engine mechanical for the following conditions: Compression. Sticking or leaking valves. Worn camshaft lobes. Valve timing. Worn rocker arms. Broken valve springs. Excessive oil in combustion chamber or leaking valve seals. Go to appropriate article in ENGINES.
  2. For incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. in appropriate article in ENGINES.
  3. Go to appropriate article in ENGINES for diagnosis procedures.
  1. Test for incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTICS PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  2. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Test the fuel injectors. Go to «FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL»(ref-153404-S30411575462003040400000) , «FUEL INJECTOR BALANCE TEST WITH TECH 2»(ref-153404-S27079648652003052700000) , or «FUEL INJECTOR COIL TEST»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.

Check for the following conditions that may cause the engine to run lean

  1. Any water intrusion in the HO2S connector.
  2. An exhaust leak between the HO2S and the engine. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) .
  3. Any vacuum leaks.
  4. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Any restricted fuel injectors.
  6. Fuel contamination.
  7. Any vacuum hoses that are split, kinked, or improperly connected.

Check for an Engine Coolant Temperature (ECT) sensor that has shifted in value. Go to TEMPERATURE VS. RESISTANCE table.

°F (°C)Ohms
302 (150)47
284 (140)60
266 (130)77
248 (120)100
230 (110)132
212 (100)177
194 (90)241
176 (80)332
158 (70)467
140 (60)667
122 (50)973
113 (45)1188
104 (40)1459
95 (35)1802
86 (30)2238
77 (25)2796
68 (20)3520
59 (15)4450
50 (10)5670
41 (5)7280
32 (0)9420
23 (-5)12,300
14 (-10)16,180
5 (-15)21,450
4 (-20)28,680
22 (-30)52,700
40 (-40)100,700

TEMPERATURE VS. RESISTANCE

  1. To properly check the spark plugs or to correct a condition, refer to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes, heavy deposits and verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) for proper ground connection.

Engine Cooling System

Check for obvious overheating conditions

  1. Low engine coolant.
  2. A faulty thermostat.
  3. A restricted air flow to the radiator or restricted coolant flow through the radiator.
  4. An inoperative electric cooling fan.
  5. Proper tension on the drive belts.
  6. Correct coolant solution should be a 50/50 mix.

Check for the following engine mechanical conditions

  1. Excessive oil in combustion chamber or leaking valve seals.
  2. High cylinder compression.
  3. Combustion chambers for excessive carbon buildup.
  4. Incorrect camshaft timing.
  5. Check for incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. Go to appropriate article in ENGINES.
  1. Check the fuel pressure regulator hose for the presence of fuel. Replace the fuel pressure regulator if fuel is found in the hose.
  2. Test the fuel injectors. Go to «FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL»(ref-153404-S30411575462003040400000) , «FUEL INJECTOR BALANCE TEST WITH TECH 2»(ref-153404-S27079648652003052700000) , or «FUEL INJECTOR COIL TEST»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.

EXHAUST LEAKAGE

WARNINGWhile engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
  1. Check for an Engine Coolant Temperature (ECT) sensor that has shifted in value. Go to «TEMPERATURE VS. RESISTANCE»(ref-153405-S33004112412003040400000) table.
  2. Check for proper operation of the Manifold Absolute Pressure (MAP) sensor. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article. If no, system is okay at this time.
  3. Check for proper operation of the Throttle Position (TP) sensor. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article. If no, system is okay at this time.
  4. Test for proper operation of the Intake Air Control (IAC) valve. Go to «IDLE AIR CONTROL SYSTEM»(ref-153404-S38183197662003040400000) under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  1. Verify there is adequate fuel.
  2. Check the fuel pump operation. The fuel pump should turn ON for 2 seconds when the ignition switch is turned to RUN position. Go to «FUEL PUMP CIRCUIT DIAGNOSIS»(ref-153404-S22833539312003050500000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Faulty in-tank fuel pump check valve allows the fuel in the lines to drain back to the tank after the engine stops. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Test the fuel injectors. Go to «FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL»(ref-153404-S30411575462003040400000) , «FUEL INJECTOR BALANCE TEST WITH TECH 2»(ref-153404-S27079648652003052700000) , or «FUEL INJECTOR COIL TEST»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Check for incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  6. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  7. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  1. To properly check the spark plugs or to correct a condition, refer to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for the following conditions: Correct heat range. Wet plugs. Cracks. Wear. Improper gap. Burned electrodes. Heavy deposits. Verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) for proper ground connection.
  1. Excessive oil in combustion chamber or leaking valve seals.
  2. Low cylinder compression.
  3. Improper valve timing.
  4. Combustion chambers for excessive carbon buildup. Clean the chambers using top engine cleaner. Follow manufacturers instructions on the can.
  5. Check for incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. Go to appropriate article in ENGINES.

Additional Checks

  1. Check for a restricted exhaust. Go to «RESTRICTED EXHAUST»(ref-153405-S10795551862003051300000) .
  2. Check for collapsed, damaged, loose, improperly installed, or leaking air intake ducts.
  1. Check the Heated Oxygen Sensors (HO2S). The HO2S should respond quickly to different throttle positions. If they do not, check the HO2S for silicon or other contaminates from fuel or the use of improper RTV sealant. The sensors may have a White, powdery coating and result in a high but false signal voltage rich exhaust indication. The PCM will then reduce the amount of fuel delivered to the engine causing a severe driveability problem.
  2. Check for the following that may cause the engine to run rich: Any water intrusion in the HO2S connector. The engine oil contaminated by fuel. An EVAP canister purge condition. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. A leaking fuel pressure regulator. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any leaking fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected. An air intake duct that is collapsed or restricted. An air filter that is dirty or restricted.
  3. Check for the following conditions that may cause the engine to run lean: Any water intrusion in the HO2S connector. An exhaust leak between the HO2S and the engine. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) . Any vacuum leaks. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any restricted fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Fuel contamination. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected.
  4. Check for proper operation of the Manifold Absolute Pressure (MAP) sensor. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE - GASOLINE article.
  5. Check for proper operation of the Throttle Position (TP) sensor. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) in DIAGNOSTIC TESTS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE - GASOLINE article.
  6. Check for proper operation of the Engine Coolant Temperature (ECT) sensor. Go to «TEMPERATURE VS. RESISTANCE»(ref-153405-S33004112412003040400000) table.
  1. Test for incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  2. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Test the fuel injectors. Go to «FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL»(ref-153404-S30411575462003040400000) , «FUEL INJECTOR BALANCE TEST WITH TECH 2»(ref-153404-S27079648652003052700000) , or «FUEL INJECTOR COIL TEST»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  1. Check for the following that may cause the engine to run rich: Any water intrusion in the HO2S connector. The engine oil contaminated by fuel. An EVAP canister purge condition. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. A leaking fuel pressure regulator. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any leaking fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected. An air intake duct that is collapsed or restricted. An air filter that is dirty or restricted.
  2. Check for the following conditions that may cause the engine to run lean: Any water intrusion in the HO2S connector. An exhaust leak between the HO2S and the engine. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) . Any vacuum leaks. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any restricted fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Fuel contamination. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected.
  3. Use a scan tool to monitor the Knock Sensor (KS) system for excessive spark retard activity.
  1. To properly check the spark plugs or to correct a condition, refer to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for the following conditions: Correct heat range. Wet plugs. Cracks. Wear. Improper gap. Burned electrodes. Heavy deposits. Verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) module for proper ground connection.
  8. Monitor the MISFIRE CURRENT COUNTERS while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedure for diagnosis. Go to «DTC P0300: ENGINE MISFIRE DETECTED»(ref-153397-S37036522042003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  1. Check for incorrect camshaft timing.
  2. Check for excessive oil in the combustion chambers and leaking valve seals.
  3. Test for low cylinder compression.
  4. Check for incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. Go to appropriate article in ENGINES.
  1. Discuss with the owner the type, quality, and alcohol content of the fuel. Oxygenated fuels have lower energy and may deliver reduced fuel economy. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  2. Check the fuel injectors. Go to «FUEL INJECTOR COIL TEST»(ref-153404-S39822063482003040400000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Test for incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS in (GASOLINE) BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  6. Check that each fuel injector harness is connected to the correct injector and cylinder. Relocate the injector harnesses as necessary.
  7. Check for fuel in the pressure regulator vacuum hose. If there is fuel in the hose replace the regulator.
  1. Check for the following that may cause the engine to run rich: Any water intrusion in the HO2S connector. The engine oil contaminated by fuel. An EVAP canister purge condition. Incorrect fuel pressure. Go to «FUEL PRESSURE TEST»(ref-153407-S10485392962003050500000) under FUEL SYSTEMS (GASOLINE) in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. A leaking fuel pressure regulator. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any leaking fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected. An air intake duct that is collapsed or restricted. An air filter that is dirty or restricted.
  2. Check the air intake system and crankcase for air leaks.
  3. Check for an Engine Coolant Temperature (ECT) sensor that has shifted in value. Go to «TEMPERATURE VS. RESISTANCE»(ref-153405-S33004112412003040400000) table.
  4. Check the crankcase ventilation system for proper operation.
  5. Check for an inaccurate speedometer.
  6. Use a scan tool to monitor the Knock Sensor (KS) system for excessive spark retard activity.
  1. To properly check the spark plugs or to correct a condition, refer to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for the following conditions: Correct heat range. Wet plugs. Cracks. Wear. Improper gap. Burned electrodes. Heavy deposits. Verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) for proper ground connection.
  8. Monitor the MISFIRE CURRENT COUNTERS while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedures for diagnosis. Go to «DTC P0300: ENGINE MISFIRE DETECTED»(ref-153397-S37036522042003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  1. Ensure engine coolant level is full.
  2. Check the engine thermostat for proper operation and for correct heat range. Go to «TEMPERATURE VS. RESISTANCE»(ref-153405-S33004112412003040400000) table.
  1. Check engine mechanical for the following conditions: Compression. Sticking or leaking valves. Worn camshaft lobes. Valve timing. Worn rocker arms. Broken valve springs. Excessive oil in combustion chamber or leaking valve seals. Go to appropriate article in ENGINES.
  2. Check for incorrect basic engine parts. Check the camshaft, cylinder heads, pistons, etc. Go to appropriate article in ENGINES.

Difficult To Fill

  1. Fill limiter vent valve stuck closed.
  2. Evaporative Emission (EVAP) canister restricted.
  3. EVAP vent valve stuck closed.
  4. Restricted vapor lines.
  5. High Reid vapor pressure or high fuel temperature.
  6. Fuel filler hose is pinched or kinked.
  7. Ignition switch in RUN position (vent valve closed).

Overfill

  1. Pressure relief valve is stuck open or leaking.
  2. Fill limiter vent valve stuck open or leaking.

Pre-Mature Shut-Off Of The Fuel Dispensing Nozzle

  1. Fill limiter vent valve stuck closed.
  2. EVAP canister restricted.
  3. EVAP vent valve stuck closed.
  4. Restricted vapor lines.
  5. High Reid vapor pressure or high fuel temperature.
  6. Ignition switch in RUN position (vent valve closed).

Fuel Spitback

  1. Restricted EVAP canister.
  2. High Reid vapor pressure or high fuel temperature.
  3. Ignition switch in RUN position (vent valve closed).

RESTRICTED EXHAUST

WARNINGWhile engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
  1. Check the fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  2. Check for incorrect fuel pressure. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  3. Check for a restricted fuel filter. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  4. Check for a contaminated fuel condition. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Ensure each fuel injector harness is connected to the correct injector/cylinder. Relocate fuel injector harnesses as necessary.
  1. Check for the following that may cause the engine to run rich: Any water intrusion in the HO2S connector. The engine oil contaminated by fuel. An EVAP canister purge condition. Incorrect fuel pressure. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. A leaking fuel pressure regulator. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected. An air intake duct that is collapsed or restricted. An air filter that is dirty or restricted.
  2. Check for the following conditions that may cause the engine to run lean: Any water intrusion in the HO2S connector. An exhaust leak between the HO2S and the engine. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) . Any vacuum leaks. Incorrect fuel pressure. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any restricted fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Fuel contamination. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected.
  3. Check for the following conditions which cause an incorrect idle speed: Any throttle body tampering, excessive deposits, or damage. A restricted air intake system. A large vacuum leak.
  4. Check the Throttle Position (TP) sensor and related wiring. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) in DIAGNOSTIC TESTS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
  5. Check the crankcase ventilation system for proper operation.
  6. Use a scan tool to monitor the Knock Sensor (KS) system for excessive spark retard activity.

Preliminary

Go to PRELIMINARY INSPECTION before continuing.

Verify the driver understands the operation of the transmission Torque Converter Clutch (TCC) and A/C compressor operation as explained in the owners manual.

  1. Check the Heated Oxygen Sensors (HO2S). The HO2S should respond quickly to different throttle positions. If they do not, check the HO2S for silicon or other contaminates from fuel or the use of improper RTV sealant. The sensors may have a White, powdery coating and result in a high but false signal voltage rich exhaust indication. The PCM will then reduce the amount of fuel delivered to the engine causing a severe driveability problem.
  2. Check for the following that may cause the engine to run rich: Any water intrusion in the HO2S connector. Fuel contamination. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. An EVAP canister purge condition. Incorrect fuel pressure. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. A leaking fuel pressure regulator. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any leaking fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected. An air intake duct that is collapsed or restricted. An air filter that is dirty or restricted.
  3. Check for the following conditions that may cause the engine to run lean: Any water intrusion in the HO2S connector. An exhaust leak between the HO2S and the engine. Go to «EXHAUST LEAKAGE»(ref-153405-S33013154762003051300000) . Any vacuum leaks. Incorrect fuel pressure. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any restricted fuel injectors. Go to «FUEL SYSTEM DIAGNOSIS (GASOLINE)»(ref-153407-S03416773192003120300000) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Fuel contamination. Go to «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL»(ref-153404-S21125380892003052000000) or «ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL»(ref-153404-S29087917302003052700000) under FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Any vacuum hoses that are split, kinked, or improperly connected.
  4. Check for an Engine Coolant Temperature (ECT) sensor that has shifted in value. Go to «TEMPERATURE VS. RESISTANCE»(ref-153405-S33004112412003040400000) table.
  5. Check for proper operation of the Manifold Absolute Pressure (MAP) sensor. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  6. Check for proper operation of the Throttle Position (TP) sensor. Go to «DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-153397-S36390896992003040400000) in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  7. Check for proper operation of the Engine Coolant Temperature (ECT) sensor. Go to «TEMPERATURE VS. RESISTANCE»(ref-153405-S33004112412003040400000) table.
  1. To properly check the spark plugs or to correct a condition, go to the following procedures: Ignition System Specifications. Go to «IGNITION SYSTEMS»(ref-151533-S14541090962002123100000) in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or «IGNITION SYSTEMS»(ref-151507-S06538971442002123000000) in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article. Spark Plug Inspection. Go to «SPARK PLUGS»(ref-153404-S01712188762003051400000) under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes or heavy deposits. Verify the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) module for proper ground connection.
  8. Monitor the MISFIRE CURRENT COUNTERS while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedures for diagnosis. Go to «DTC P0300: ENGINE MISFIRE DETECTED»(ref-153397-S37036522042003040400000) under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.

INTERMITTENTS

CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. Go to COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

Note. The condition may or may not illuminate the Malfunction Indicator Light (MIL) or store a Diagnostic Trouble Code (DTC). The fault must be present to be diagnosed.

Perform the Diagnostic System Check - Engine Controls before starting. Go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.

INTERMITTENT CONDITIONS

Most intermittent conditions are caused by faulty electrical connections or wiring. Perform a careful visual/physical check. Check for the following conditions

  1. Poor mating of the electrical connector halves or a terminal not fully seated in the electrical connector (backed out).
  2. All electrical connector terminals in the problem circuit should be carefully checked for proper contact tension.
  3. Poor terminal to wire connection. This requires removing the terminal from the connector body to check.

The vehicle may be driven with a DMM connected to a suspected circuit. An abnormal voltage is a good indication that there is a malfunction in the circuit being monitored.

A scan tool can be used to help detect intermittent conditions. The scan tool has several features that can be used to locate an intermittent condition.

The Snapshot feature can be triggered to capture and store engine parameters within the scan tool when the malfunction occurs. This stored information then can be reviewed by the service technician to see what caused the malfunction.

Using a scan tools Freeze Frame buffer can also aid in locating an intermittent condition. Review and record the information in the Freeze Frame associated with the intermittent DTC being diagnosed. The vehicle can be driven within the conditions that were present when the DTC originally set.

To check loss of DTC memory, disconnect the Throttle Position (TP) sensor and idle the engine until the MIL, CHECK ENGINE, illuminates. DTC P0122 should be stored and kept in memory when the ignition is turned OFF. If not the Powertrain Control Module (PCM) is faulty. When this test is completed, make sure that you clear the DTC P0122 from memory.

An intermittent MIL or CHECK ENGINE, with no stored DTC may be caused by the following

  1. The ignition coil shorted to ground and arcing at ignition wires or plugs.
  2. The MIL, check engine, wire to PCM shorted to ground.
  3. Poor PCM grounds.

If the intermittent condition exists as a start and then stall, check for DTCs relating to the vehicle theft deterrent system.

They can cause a sharp electrical surge. Normally, the problem will occur when the malfunctioning component is operated. Check for improper installation of electrical options such as lights, cellular phones etc. All Ignition Control Module (ICM) wiring should kept away from the generator. Check all wires from the PCM to the ICM for poor harness connections. Check for an open diode across the A/C compressor clutch and check for other open diodes.

ALERO

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

CAVALIER

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

GRAND AM

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

SUNFIRE

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

More articles — Engine Controls - Trouble Shooting - No Codes - 2.2L