Engine Starts Hard or Fails to Start Warm

Check the following:

1. Insufficient fuel rest pressure

2. Carbon canister solenoid valves [1]

3. Fuel leaks

4. Vacuum (intake air) leaks

5. Cold start valve leaking

6. Faulty after-start enrichment [1]

7. Fuel injector(s) clogged

8. Air flow sensor rest position incorrect

9. Fuel pressure incorrect

10. Coolant temperature sensor and wiring [1]

11. Oxygen sensor system faulty [1]

12. Fuel delivery inadequate

[1] For testing procedure refer to, COMPUTERIZED ENGINE CONTROLS.

NOTE: After each symptom, the sub-system that could be the source of the symptom are listed and should be checked in the order they are listed, beginning with #1.