Diagnostic Notes

This section is used to find the correct test procedure for a given symptom. Symptoms and actions in this section are for EMISSION CONTROL DEVICES. Refer to FUEL SYSTEM SUPPLY AND AIR INDUCTION SYSTEMS and COMPUTERS AND CONTROL SYSTEMS for diagnosis related to those systems. Verify correct system application to ensure that vehicle has given component(s).

Before proceding to appropriate symptom, perform the following visual inspections:

1. Vacuum hoses for splits, kinks and proper routing.
2. Ignition wires for cracking, hardness and proper connections at both distributor and spark plugs.
3. All wiring for proper connections, pinches, routing, and cuts.

NOTE: Catalytic converters and feedback systems do not operate until they are at normal operating temperature. It is essential that the vehicle has been properly warmed up and is at operating temperature (except when attempting to diagnosis a cold driveability problem). Failure to do so will result in inaccurate test results.