Preliminary Inspection

NOTE: If engine will not start or stalls after start, refer to PFI CHART A-3: NO START OR STALL AFTER START in SELF-DIAGNOSTICS article.

Several of the symptom procedures in this article call for a careful visual check. This check should include:

Check for blown or missing fuses and for relays missing or installed in the wrong locations.
Check vacuum hoses for splits, kinks, and proper connections, as shown on Emission Control Information label.
Check for air leaks at throttle body mounting, lower intake manifold, and upper intake manifold.
Check ignition wires for cracking, hardness, proper routing, and carbon tracking.
Check wiring for proper connections, pinches, and cuts.

The importance of these steps cannot be stressed too strongly, they can lead to correcting a problem without further checks and can save valuable time.

Before proceeding to diagnose symptoms, perform PFI SYSTEM CHECK in SELF-DIAGNOSTICS article. Ensure that:

The ECM and "Engine Control System Fault" telltale is operating properly.
There are no trouble codes stored, or there is a trouble code but no current code.
The fuel control system is operating properly.

Verify the customer complaint, and locate the correct symptom. See SYMPTOMS . Check the items indicated under that symptom. If the engine will not start or stalls after start, see PFI CHART A-3: NO START OR STALL AFTER START in SELF-DIAGNOSTICS article.