Test Notes

Enter this pinpoint test only when directed here.

Preliminary checks must be performed before continuing this pinpoint test:
- Electrical connections
- Vacuum leaks
- Fuel level and quality
- Ignition wiring connections
- Intake air filters, tubes and gaskets
- Aftermarket alterations
- Basic engine (valves, timing, etc.)

This pinpoint test contains instructions for isolating an intermittent fault. It combines the use of a scan tool with a breakout box, a fuel pressure gauge, vacuum gauge and ignition tester. If available, the Service Bay Diagnostic System can be used for intermittent diagnostics. Actual values can be compared to typical values listed in Reference Values to aid in finding the fault. Normal Scan Data Values - Includes Pids

Also refer to Intermittent Diagnostic Techniques, for further help in isolating and repairing the fault. Intermittent Symptoms