Symptom Related Diagnostic Procedures

Engine Does Not Start

1. Blade fuse defective.
2. No spark, defect in ignition system.
3. Fuse No. 12 defective.
4. Loose or disconnected connectors.
5. Leaking air intake system.
6. Defective fuel pump.
7. Incorrect line pressure.
8. Faulty ground connections.
9. No current to injection system.
10. Fuel pump and/or system relays defective.
11. Starter motor wiring defective.
12. Ignition coil wiring defective.

Hard Starting

1. Loose or disconnected connectors.
2. Leaking air intake system.
3. Incorrect line pressure.
4. Starter motor wiring defective.
5. Defective temperature sensor.
6. Faulty starting system.

Poor Performance

1. Leaking air intake system.
2. Defective injectors.
3. Incorrect line pressure.
4. No current to or bad ground at air mass meter.
5. Air mass meter wiring defective.
6. Defective air mass meter.

Poor Mileage

1. External fuel leakage.
2. Throttle valve switch improperly adjusted.
3. Incorrect line pressure.
4. Defective throttle valve switch.
5. Incorrect CO level.

Low Top Speed & Poor Performance

1. Throttle valve improperly adjusted.
2. Leaking air intake system.
3. Defective tank pump.
4. Incorrect line pressure.
5. Defective throttle valve switch.
6. Incorrect full throttle function.
7. Incorrect CO level.

Unstable Idle Speed

1. Leaking air intake system.
2. Engine not running on all cylinders.
3. Air control valve hose clogged or disconnected.
4. Loose throttle valve.
5. Throttle valve improperly adjusted.

Excessive Idle Speed

1. Loose electrical connector at temperature sensor.
2. Throttle valve switch improperly adjusted.
3. Defective temperature sensor.
4. Defective throttle valve switch.
5. Throttle control improperly adjusted.
6. Idle speed improperly adjusted.

Idle Speed Too Low With Engine Cold

1. Incorrect fast idle function.
2. Defective temperature sensor.
3. Defective air control valve.

Poor Acceleration, Surging

1. Defective acceleration enrichment.