- Important Preliminary Checks

BEFORE STARTING
Before using this section, you should have performed the "Diagnostic Circuit Check". Testing and Inspection
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 the appropriate diagnostic chart under A Charts. Related Tests, Information and Procedures

Note: Refer to the related system for corrective action of driveability symptoms that are not fuel or emission related.

Careful Visual Check
Several of the following symptom procedures call for a careful visual (physical) check.
This check should include:
- Vacuum hoses for splits, kinks, and proper connections, as shown on Vehicle 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.

Note: The importance of this step cannot be stressed too strongly - it can lead to correcting a problem without further check. and can save valuable time.

The following symptoms cover several engines. To determine if a particular system or component is used, refer to the ECM wiring diagrams for application.