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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.
- Check cold start injector system (if equipped).