- Preliminary Information

This section is used to find the correct test procedure for a given symptom. The symptoms and actions in this section are Emission related only. Always use the FLOW OF DIAGNOSIS for proper testing sequence. Verify the correct system application to ensure that the vehicle has the proper component(s).


Before proceeding to the appropriate symptom, perform the following inspection:
NOTE: It is essential that the vehicle has been properly warmed up and is at operating temperature, except when attempting to diagnosis a cold driveablity problem. The catalytic converter and feedback system will not function as designed if this is not achieved. Failure to do so will result in inaccurate test results.

VISUALLY CHECK:
1. ECM grounds for being clean and tight.
2. Vacuum hoses for splits, kinks and proper routing.
3. Air leaks at throttle body mounting and intake manifold.
4. Ignition wires for cracking, hardness and proper connections at both the distributor and spark plugs.
5. All wiring for proper connections, pinches and cuts.
6. Harnesses (EST, ESC, etc...) for proper routing.