Tune-Up Notes

NOTE: When performing tune-up procedures described in this article, the following notes and precautions must be followed:

Always refer to Vehicle Emission Control Information Label in engine compartment before tune-up. If manual and label differ, always use label specifications.

With the exception of initial ignition timing, normal tune-up adjustments are not required. Perform adjustments only when indicated by the Computer Command Control (CCC) System Performance Check, CCC diagnostic charts and/or poor engine performance.

Do not allow or create a condition of engine misfire in more than one cylinder for an extended period of time. Damage to catalytic converter may occur due to loading converter with unburned air/fuel mixture.

Before making a compression test or cranking engine with a remote starting switch, disconnect ignition switch positive terminal lead at distributor or coils.

Do not add cleaning agents to fuel system as they can damage the catalytic converter.

Do not remove spark plug wires with engine running. Secondary ignition voltage may inflict harmful electrical shock.

Damage to electronic module and/or ignition coil(s) may result if tachometer terminal is grounded.

NOTE: On engines equipped with the C(3)I or Direct Ignition systems, a "Scan" tester, or equipment using special inductive adapters, must be used to obtain an RPM signal.