Feedback Carburetor Component Test Chevrolet Camaro II

System Performance Check Chart. Scheme 183

Diagnostic Circuit Check Chart. Scheme 184

ENGINE PERFORMANCE PROBLEM - ODOR, SURGE, FUEL ECONOMY OR EMISSION PROBLEM

1. If the "CHECK ENGINE" light is not on, normal checks that would be performed on cars without the system should be done first.
2. If the alternator or coolant light is on with the "CHECK ENGINE" light, they should be diagnosed first.
3. Inspect for poor connections at coolant sensor, mixture control solenoid, etc. Also check for poor or loose vacuum hoses and connections. Repair as necessary.
4. If there is an intermittent "CHECK ENGINE" light, but no trouble code is stored, check the following: Check for intermittent connection in circuit between ignition coil to ground. Check for arcing at spark plug wires or spark plugs. Check battery to ECM terminals "C" and "R". Check ECM Terminals "A" and "U" to engine ground. Check for loss of trouble code long-term memory: Grounding dwell lead for 10 seconds with "TEST" lead ungrounded should produce a Code 23 which should be retained after the engine is turned off and the ignition switch is turned to "RUN" position. If a Code 23 is not displayed, ECM is defective and must be replaced. Ensure that the EST wires are kept away from the spark plug wires, distributor housing, ignition coil and alternator. Wires from ECM Terminal No. 13 to distributor and the shield (if used) should have a good ground.
5. If the customer is complaining of stalling, rough idle, dieseling or improper idle speed, see IDLE SPEED CONTROL CHECK.
6. If the complaint is detonation (spark knock) check the following items: Check the ESC system. Refer to ESC SYSTEM CHECK. Check the MAP or Vacuum Sensor output. See CHART 7 - MAP & BARO OUTPUT CHECK or CHART 8 - VACUUM SENSOR CHECK. Check EGR system. Refer to EGR VALVE CHECK. Check TPS enrichment system operation. See TPS ENRICHMENT CHECK. Check HEI operation. Refer to appropriate IGNITION SYSTEM article in the ELECTRICAL section.
7. If the complaint is poor performance and/or poor fuel economy, check the following: Perform appropriate EST PERFORMANCE CHECK. Perform ESC SYSTEM CHECK.
8. If the customer is experiencing poor full throttle performance, refer to CRANKS, BUT WON'T RUN chart.
9. If the complaint is intermittent no starts, make the following checks: Check for incorrect pick-up coil or ignition coil. See CRANKS, BUT WON'T RUN chart. Check for intermittent ground connection on ECM.

ALL OTHER COMPLAINTS

For any other complaints, do the SYSTEM PERFORMANCE CHECK with engine warmed to normal operating temperature. Ensure all repairs have been made to vehicle before performing SYSTEM PERFORMANCE CHECK.

CHART 1 - Dwell Fixed Under 10° (Lean Exhaust Indication). Scheme 185

CHART 2 - Dwell Between 10°-50° Open Coolant/O2 Sensor Ckt. Scheme 186

CHART 3 - Fixed Dwell Over 50° (Rich Exhaust Indication). Scheme 187

CHART 4 - TPS Enrichment Check. Scheme 188

CHART 5 - "CHECK ENGINE" Light Inoperative. Scheme 189

CHART 6 - Won't Flash Code 12 (Remote Lamp Driver In Harness). Scheme 190

CHART 7 - Map & Baro Output Check. Scheme 191

CHART 8 - Vacuum Sensor Check. Scheme 192

Flow Chart - Canister Purge Valve Check. Scheme 193

Flow Chart - Canister Purge Valve Check. Scheme 194

Flow Chart - Divert Valve Check. Scheme 195

Flow Chart - Divert Valve Check (1 Of 2). Scheme 196

Flow Chart - Divert Valve Check (2 Of 2). Scheme 197

Flow Chart - Air Mgmt Sys Chk W/ Elec Air Cont & Elec Switch Valve. Scheme 198

Flow Chart - Air Mgmt Sys Chk W/ Elec Air Cont & Elec Switch Valve. Scheme 199

Flow Chart - EFE (Electrically Heated) Check (3.8L Turbo). Scheme 200

Flow Chart - EFE (Electrically Heated) Check (3.8L Turbo). Scheme 201

Flow Chart - EFE (Electrically Heated) Chk (Exc 3.8L Turbo). Scheme 202

Flow Chart - EFE (Electrically Heated) Chk (Exc 3.8L Turbo). Scheme 203

Flow Chart - EFE (Vacuum Servo) Check. Scheme 204

Flow Chart - EFE (Vacuum Servo) Check. Scheme 205

Flow Chart - EGR Valve Chk (3.8L VIN A/Cal, 4.1L & 5.0L VIN Y). Scheme 206

Flow Chart - EGR Valve Chk (3.8L VIN A/Cal, 4.1L & 5.0L VIN Y). Scheme 207

Flow Chart - Electric Diverter Valve Check (EDV) 3.8L VIN "A"/Calif., 5.0L VIN "H"/Calif. - "B" & "G" Series, & 5.7L Calif. Scheme 208

Flow Chart - Electric Diverter Valve Check (EDV) 3.8L VIN "A"/Calif., 5.0L VIN "H"/Calif. - "B" & "G" Series, & 5.7L Calif. Scheme 209

Flow Chart - Electronic Spark Control (ESC) System Check (Engine Knock, Poor Performance Or Poor Economy) - No Code 43. Scheme 210

Flow Chart - Electronic Spark Control (ESC) System Check (Engine Knock, Poor Performance Or Poor Economy) - No Code 43. Scheme 211

Flow Chart - Engine Cranks, But Won't Run (W/Integral Coil). Scheme 212

Flow Chart - Engine Cranks, But Won't Run (With Remote Coil). Scheme 213

Flow Chart - EST Performance Check (Exc. 5.0L VIN "Y" & "9"). Scheme 214

Flow Chart - EST Performance Check (Exc. 5.0L VIN "Y" & "9"). Scheme 215

Flow Chart - EST Performance Check (5.0L VIN "Y" & "9"). Scheme 216

Flow Chart - EST Performance Check (5.0L VIN "Y" & "9"). Scheme 217

Flow Chart - Idle Speed Control (ISC) Check. Scheme 218

Flow Chart - Idle Speed Control (ISC) Check. Scheme 219

Flow Chart - Pulsair Solenoid Check. Scheme 220

Flow Chart - Pulsair Solenoid Check. Scheme 221

Flow Chart - Pulse Width Modulated (PWM) EGR Check - 2.8L, 3.0L, 3.8L (Exc. 3.8L VIN "A" Calif.), 5.0L VIN "H" & 5.7L VIN "L". Scheme 222

Flow Chart - Pulse Width Modulated (PWM) EGR Check - 2.8L, 3.0L, 3.8L (Exc. 3.8L VIN "A" Calif.), 5.0L VIN "H" & 5.7L VIN "L". Scheme 223

Flow Chart - Torque Converter Clutch (TCC) Elec Diagnosis. Scheme 224

Flow Chart - Torque Converter Clutch (TCC) Elec Diagnosis (1 Of 2). Scheme 225

Flow Chart - Torque Converter Clutch (TCC) Elec Diagnosis (2 Of 2). Scheme 226