Engine Performance

It is important that the vehicle is operating to its optimum performance level to maintain fuel economy and the lowest emission levels.
1. Test cranking amperage draw.
2. Tighten the intake manifold bolts.
3. Clean or replace spark plugs as necessary. Adjust gap.
4. Test resistance of spark plug cables.
5. Inspect the primary wire. Test coil output voltage, primary and secondary resistance. Replace parts as necessary.
6. Set ignition timing to specification. Refer to Specification Label on engine compartment hood. (This step does not apply to 8.0L engines.)
7. Perform a combustion analysis.
8. Test fuel pump for pressure and vacuum.
9. Inspect air filter element.
10. Inspect crankcase ventilation system.
11. For emissions controls, refer to Emissions Controls System for service procedures.
12. Inspect accessory belt drives.
13. Road-test vehicle as a final test.