Tune-Up Notes
NOTE:
In order to comply with emission standards, specifications shown on engine compartment Emission Control Tune-Up Decal must be used in all instances.
NOTE:
Diesel engines require no tune-up type servicing. The only adjustment applicable is Injection Pump Timing which will be covered in this article. For additional information, see General Motors Diesel Fuel Injection article in FUEL SYSTEMS section.
NOTE:
The EPA High Altitude emission standards apply to vehicles sold in certain areas outside of California which have an elevation above 4000 feet.
NOTE:
Do not remove spark plug wires with engine running. High Energy Ignition (HEI) system secondary voltage is higher than standard ignition systems and may inflict harmful electrical shock.
NOTE:
Damage to HEI electronic module may result if "TACH" terminal, in distributor cap connector, is directly grounded.