Preliminary Testing

Several driveability problems may result from faulty or poor wiring, loose and/or leaking hose connections, or basic engine systems malfunctions. To avoid unnecessary component testing, check the following areas before beginning trouble shooting of the system.

• Intake air system leaks.
• Electrical connections at all components.
• Vacuum lines (secure and leak-free).
• Battery charge and water level.
• Ignition components (distributor, plugs, coil).
• Ignition timing.
• Engine compression.
• Valves properly adjusted.
• Correct oil pressure.
• Correct fuel pressure.

Most of the engine symptoms listed may also be caused by either a leaking cold start injector or a defective airflow meter. Check these components first when diagnosing engine malfunctions.