Engine Performance

Engine Performance
If a loss of performance is noticed, the timing belt may have skipped one or two teeth. The camshaft and crankshaft timing should be checked.
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. Tighten the intake manifold bolts to specifications.
3. Perform cylinder compression pressure test.
4. Clean or replace spark plugs as necessary and adjust gap as specified. Tighten to specifications.
5. Test ignition coils. Replace parts as necessary.
6. Test fuel pump for correct pressure.
7. Replace air filter elements.
8. Inspect crankcase ventilation system.
9. Inspect and adjust accessory belt drives.
10. Road test vehicle as a final test.