- Important Preliminary Checks

BEFORE STARTING
Before using this section you should have performed the DIAGNOSTIC CIRCUIT CHECK and found out that:

^ The Electronic Control Module (ECM) and "Service Engine Soon" light are operating.

^ There are no trouble codes.

^ 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, see CHART A-3.
Related Tests, Information and Procedures

Several of the symptom procedures below call for a Careful Visual Check. This check should include:

^ ECM grounds for being clean and tight.

^ Vacuum hoses for splits, kinks and proper connections, as shown on Emission Control Information label.

^ Air leaks at throttle body mounting and intake manifold.

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

^ Wiring for proper connections, pinches, and cuts.
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.