On-Vehicle Service

STANDARD PROCEDURE - ENGINE PERFORMANCE
It is important that the vehicle is operating to its optimum performance level to maintain fuel economy and the lowest emission levels. If vehicle is not operating to these standards, refer to Engine Diagnosis. The following procedures can assist in achieving the proper engine diagnosis.
1. Test cranking amperage draw.
2. Check intake manifold bolt torque.
3. Perform cylinder compression test.
4. Clean or replace spark plugs as necessary.
5. Test coil output voltage and primary resistance. Replace parts as necessary.
6. Test fuel pump for pressure.
7. The air filter elements should be replaced as specified.
8. Inspect crankcase ventilation system.
9. Road test vehicle as a final test.