Tune-Up Notes

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

Always refer to Engine Tune-Up Decal in engine compartment before tune-up. If manual and decal differ, always use decal 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 "BATT" terminal lead at distributor.
Do not add cleaning agents to fuel system as they can damage the catalytic converter.
Do not remove spark plug wires with engine running. HEI secondary voltage may inflict harmful electrical shock.
Damage to HEI electronic module and/or ignition coil may result if "TACH" terminal in distributor cap connector is grounded.