Engine Fails To Crank
* Check battery, cables, charging system and fusible links.
* Check ignition switch.
* Check starter and wiring connections.
* Check clutch switch (M/T) or park/neutral position switch (A/T).
* Check starter relay (if equipped).
* Check theft deterrent system (if equipped). Engine Cranks But Fails To Start
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Check engine compression, valve clearance, valve timing and timing belt (if equipped).
* Check airflow meter or MAP sensor and wiring.
* Check idle air control valve (if equipped) and wiring.
* Check circuit opening relay and EFI main relay.
* Check STA signal at Engine Control Module (ECM).
* Check Engine Control Module (ECM) and wiring. Engine Difficult To Start Under Normal Conditions
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Check STA signal at Engine Control Module (ECM).
* Check engine compression, valve clearance, valve timing and timing belt (if equipped).
* Check idle air control valve (if equipped) and wiring.
* Check EGR system. Engine Difficult To Start Under Cold Conditions
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Check STA signal at Engine Control Module (ECM).
* Check idle air control valve (if equipped) and wiring. Engine Difficult To Start Under Hot Conditions
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Ensure ignition timing is correct.
* Check fuel pressure control vacuum switching valve (if equipped) and wiring.
* Check idle air control valve (if equipped) and wiring.
* Check STA signal at Engine Control Module (ECM).
Incorrect Idle At Engine Start-Up
* Check for defective throttle linkage or cable.
* Check throttle opener or dashpot (if equipped).
* Check idle air control valve (if equipped) and wiring.
* Check Engine Control Module (ECM) and wiring.
* Check Throttle Position (TP) sensor and wiring.
* Check A/C signal circuit to Engine Control Module (ECM).
* Check park/neutral position switch signal to Engine Control Module (ECM).
* Ensure dipstick and oil filler cap are properly seated. Engine Idle Speed Remains High
* Check for defective throttle linkage or cable.
* Check dashpot or throttle opener (if equipped).
* Check idle air control valve (if equipped) and wiring.
* Check Throttle Position (TP) sensor and wiring.
* Check A/C signal circuit to Engine Control Module (ECM).
* Check park/neutral position switch signal to Engine Control Module (ECM).
* Check fuel injectors.
* Check Engine Control Module (ECM) and wiring. Engine Idle Speed Remains Low
* Check idle air control valve (if equipped) and wiring.
* Check airflow meter or MAP sensor and wiring.
* Check fuel injectors.
* Check Engine Control Module (ECM) and wiring. Rough Engine Idle
* Check for vacuum leaks.
* Check EGR system.
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Check engine compression, valve clearance, valve timing and timing belt (if equipped).
* Check airflow meter or MAP sensor and wiring.
* Check Engine Control Module (ECM) and wiring.
* Ensure dipstick and oil filler cap are properly seated. Engine Misfires
* Check EGR system.
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Check engine compression, valve clearance, valve timing and timing belt (if equipped).
* Check fuel injectors.
Hesitation & Poor Acceleration
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Check EGR system.
* Check engine compression, valve clearance, valve timing and timing belt (if equipped).
* Check Throttle Position (TP) sensor and wiring.
* Check airflow meter or MAP sensor and wiring.
* Check oxygen sensor and wiring.
* Check Engine Control Module (ECM) and wiring. Engine Backfires
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Check valve timing and timing belt (if equipped).
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Check EGR system.
* Check Throttle Position (TP) sensor and wiring.
* Check oxygen sensor and wiring. Engine Surges
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Ensure proper spark exists from ignition system.
* Ensure ignition timing is correct.
* Check Engine Control Module (ECM) and wiring. Engine Knocks
* Ensure ignition timing is correct.
* Check knock sensor (if equipped) and wiring.
* Check EGR system.
* Check valve timing and timing belt (if equipped).
* Check Engine Control Module (ECM) and wiring. Muffler Explosion
* Ensure ignition timing is correct.
* Check fuel-cut system.
* Ensure fuel injectors and fuel pressure regulator operate correctly.
* Check Throttle Position (TP) sensor and wiring.
* Check oxygen sensor and wiring.
* Check Engine Control Module (ECM) and wiring.
Engine Stalls Soon After Start-Up
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Ensure proper spark exists from ignition system.
* Check EGR system.
* Check idle air control valve (if equipped) and wiring.
* Check Engine Control Module (ECM) and wiring. Engine Stalls After Accelerator Is Depressed
* Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
* Ensure proper spark exists from ignition system.
* Check EGR system.
* Check Throttle Position (TP) sensor and wiring.
* Check Engine Control Module (ECM) and wiring. Engine Stalls After Accelerator Is Released
* Check idle air control valve (if equipped) and wiring.
* Check EGR system.
* Check Engine Control Module (ECM) and wiring. Engine Stalls During A/C Operation
* Check A/C signal circuit to Engine Control Module (ECM).
* Check idle air control valve (if equipped) and wiring.
* Check Engine Control Module (ECM) and wiring. Engine Stalls When Shifting From Neutral Into Drive (A/T Models)
* Check idle air control valve (if equipped) and wiring.
* Check park/neutral position switch signal to Engine Control Module (ECM).
Intermittent Simulation
To reproduce the conditions creating an intermittent fault, use the following methods
- Lightly vibrate component. See «VIBRATION METHOD»(ref-22354-S39232984802001010300000) .
- Wiggle or bend wiring harness. See VIBRATION METHOD.
Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for self-diagnostic codes. Use test results to identify a faulty component or circuit.