Engine Controls - Trouble Shooting - No Codes - Eec-V: Other Mercury Mountaineer I рестайлинг

ROUGH IDLE, STALLS, MISSES, HESITATION OR SURGE

Note. The Powertrain Control Module (PCM) is equipped with an over RPM/speed limiting function that will shut off fuel delivery when predetermined speed is exceeded.

Preliminary Checks

Check for vacuum leaks. Check air intake duct and air filter. Check ignition wiring. Check fuel quality (octane, winter/summer grade fuel, methanol, etc.). Check wiring harness connector for poor connections.

Check battery condition and starter current draw.

NO START/NORMAL CRANK

Extended cranking, due to a no-start condition, can load exhaust system with raw fuel, which can ruin catalytic converter after engine is started. On models with electric Secondary Air Injection (AIR) system, perform the following procedure after the no-start condition has been repaired

1. Disconnect AIR solid state relay. Start and run engine until surplus fuel is used, and then reconnect relay. Disconnecting AIR solid state relay may set a Diagnostic Trouble Code (DTC). After repairs are completed, clear DTCs. See SELF-DIAGNOSTICS - EEC-V article.

Check Inertia Fuel Shutoff (IFS) switch. Check fuel pressure and quality (octane, winter/summer grade fuel, methanol, etc.). Check alarm/anti-theft devices. Check wiring harness connectors. Check for disconnected or restricted air intake duct. Check fuses and relays.

Check for vacuum leaks. Check throttle linkage operation. Check throttle body.

Note. If engine runs normally after ignition key is turned off, check for damaged ignition switch or IGN RUN circuit short to power.

Check for vacuum leaks. Check for carbon build-up on throttle plate. Check throttle linkage operation. Check for binding/sticking cruise control linkage. Check for air intake duct leaks. Check for leaking intake manifold gasket.

Check Idle Air Control (IAC) wiring harness connector. Check for vacuum leaks. Ensure vacuum hoses are routed properly. Check air intake duct.

Check vacuum hose routing. Check spark plug wiring (if equipped) for incorrect firing order.

LOSS OF POWER

Note. The PCM is equipped with an over RPM/speed limit function. If programmed speed is exceeded, fuel delivery will shut off and DTC P1270 will be set in PCM memory. Also if vehicle is equipped with a Knock Sensor (KS), a lack of power may result when vehicle is operated with a breakout box installed at PCM. KS circuits are not shielded in the breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing will be retarded and a lack of power may result.

Verify symptom is reported under normal driving conditions without engine under excessive load conditions. Check vacuum hose routing. Check for restricted air filter. Check wiring harness connectors. Check throttle linkage. Check for obstructed radiator. Check transmission fluid.

Check vacuum hose routing. Check for restricted air intake system. Check fuel quality.

POOR FUEL ECONOMY

Note. Fuel consumption will increases during stop-and-go driving, trailer towing, short-run operation, extended winter warm-up periods, etc. Determine if these factors are the cause of poor fuel mileage before proceeding with diagnostic procedure.

Check for restricted air filter/air intake duct. Check transmission fluid level. Check fuel quality and coolant level.

EMISSIONS COMPLIANCE

Canada and some states or metropolitan areas in the United States require periodic emission, or Inspection/Maintenance (I/M) tests. All Ford products have been designed to pass these tests. If a Ford product fails an I/M test, it is probable that the engine or catalytic converter temperature was not warm and stabilized prior to the test or the vehicle had idled excessively long prior to the test.

If any emission component is changed, Keep-Alive Memory (KAM) should be cleared before repeating state emission test procedure. To clear KAM and perform relearn adaptive strategy, see RESETTING KEEP-ALIVE MEMORY (KAM) under CLEARING CODES in SELF-DIAGNOSTICS - EEC-V article.

Check for vacuum leaks/blockage. Check wiring harness connectors. Ensure proper scheduled maintenance has been performed.

Preliminary Check

Note. If symptom is both Malfunction Indicator Light (MIL) on and exhaust emission test failure, go to EMISSIONS COMPLIANCE symptom. If engine is a no-start, go to NO START/NORMAL CRANK symptom. If engine runs rough at idle, go to ROUGH IDLE, STALLS, MISSES, HESITATION OR SURGE symptom.

Check for wiring harness connectors. Ensure fuel filler cap is installed and tightened properly.

Check transmission fluid level and condition. Check for transmission leaks. Check wiring harness connectors. Check for vehicle modifications. Check for electronic add-on items. Check for misadjusted shift linkage.

Check wiring harness connectors for loose, damaged or corroded terminals.

Check for external engine oil leaks. Check for proper oil dipstick. Check for proper oil viscosity.

Perform the following checks

1. Engine coolant level.
2. Cooling fan wiring harness connections.
3. Coolant leaks.
4. Water/anti-freeze mixture.
5. Radiator condition.
6. Collapsed/restricted radiator hoses.
7. Radiator pressure cap.
8. Overflow system.

Black Smoke (Rich Mixture)

Perform the following

1. Check for restricted air cleaner/air intake duct.
2. Check fuel delivery system. See TEST HB (natural gas vehicles) or TEST HC (except natural gas vehicles) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article.
3. Check secondary ignition system. See TEST JB under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article.

Blue Smoke (Burning Oil)

Perform the following

1. Check PCV system. See TEST HG under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article.
2. Check engine mechanical condition. Check valve guides, valve stems, valve seals, oil drain passages in cylinder heads (Blue smoke on start-up), piston rings and cylinder bores.

White Smoke (Water In Combustion)

1. Check for cylinder head gasket leaks, intake manifold gasket leaks and cracked engine block.

Check fuel system for leaks.

Squeal, Click Or Chirp

1. Check for low oil level.
2. Check valve train components.
3. Check drive belts.
4. Check EEC-V solenoids.

Hiss

1. Check for cooling system leaks.
2. Check for vacuum leaks.
3. Check for loose spark plugs.
4. Check for air intake leaks.
5. Check for secondary air injection leaks.
6. Check for Evaporative Emission (EVAP) system leaks.

Snap

1. Snap noise may be due to secondary ignition arcing. Perform a visual/audible check of secondary ignition system.

Rap Or Roar

1. Check for exhaust leak.
2. Check for secondary air injection leaks.

Knock

1. Check for worn rod/main bearings.
2. Check for loose piston pins.
3. Check piston to cylinder bore clearance.
4. Knock (Detonation) - See SPARK KNOCK symptom.

Note. For additional A/C system information, see appropriate article in HVAC.

SULFUR SMELL

Note. On vehicles with a NEW catalytic converter or vehicles with 5000-10,000 miles, sulfur smell may be normal due to the highly active state of the converter. Replacing the catalytic converter on these vehicles may make the Sulfur smell worse.

Check wiring harness connectors for loose, damaged or corroded terminals. Check vacuum hoses. Verify odor is from exhaust and not from under hood odor, such as battery acid.