Symptom Definition
Engine cranks okay, but does not start for a long time. Engine eventually starts and may run okay or die immediately.
Possible Causes & Corrections:
- Check for restricted exhaust system.
- Check ignition system for bare or shorted wires, incorrect pick-up coil resistance, loose ignition coil connections or moisture in distributor cap (if equipped).
- Using Spark Tester (ST-125), check for adequate spark output.
- Check ignition control circuit for short to ground.
- Remove spark plugs. Check for wet plugs, cracks, improper gap, burned electrodes or heavy carbon deposits.
- Check for shorts by misting plug wires with water.
- Check fuel pump relay. Connect test light between fuel pump test terminal and ground. Turn ignition on. Test light should illuminate for 2 seconds. If not, check fuel pump relay. See RELAYS in SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section. For location of fuel pump test connector, see COMPONENT LOCATIONS in appropriate SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
- Check for poor fuel quality or water-contaminated fuel.
- Check for correct fuel pressure at all speeds.
- Check for a faulty in-tank fuel pump check valve. A faulty check valve allows fuel in lines to drain back to tank after engine is stopped.
- Check EGR operation.
- Ensure ECT sensor circuit resistance or ECT sensor resistance is not too high. See SENSOR RANGE CHARTS article or DTC 15 chart in appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section.
- TESTS W/CODES - 2.2L (for S10 Pickup)
- TESTS W/CODES - 4.3L (for all other models)
- Ensure TP sensor does not stick or bind. A sticking throttle shaft or binding linkage may cause a high TP sensor voltage (open throttle indication). PCM will not control idle if high voltage is sensed. TP sensor voltage should be .85 volt with throttle closed.
- Check Idle Air Control (IAC) system. Check for foreign material in IAC bore. See DTC 35 chart in appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below.
- TESTS W/CODES - 2.2L (for S10 Pickup)
- TESTS W/CODES - 4.3L (for all other models)
- Ensure correct PROM is installed in vehicle. Check with dealer for latest application information.