- Preliminary Information

IMPORTANT PRELIMINARY CHECKS

^ Before using this section you should have performed the "On-Board Diagnostic System Check."

^ Verify the customer complaint, and locate the correct symptom below, Check the items indicated under that symptom.

^ If the ENGINE CRANKS BUT WILL NOT RUN, use CHART A-3.

^ Several of the following symptom procedures call for a careful visual/physical check. The importance of this step cannot be stressed too strongly - it can lead to correcting a problem.

Without further checks and can save valuable time.



BEFORE STARTING

This check should include:

^ ECM grounds for being clean, tight, and in their proper location.

^ Vacuum hoses for splits, kinks and proper connections, as shown on "Vehicle Emission Control Information" label. Check thoroughly for any type of leak or restriction.

^ Air leaks at throttle body mounting area and intake manifold sealing surfaces.

^ Ignition wires for cracking, hardness, proper routing and carbon tracking.

^ Wiring for proper connections, pinches, and cuts.

If wiring harness or connector repair is necessary, refer to the correct procedure.

^ The following symptoms cover several engines.

To determine if a particular system or component is used, refer to the ECM wiring diagrams for application.