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Home >> Plymouth >> 1978 >> Horizon Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up Procedures - 4-Cylinder >> Tune-Up Notes

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: The EPA High Altitude emission standards apply to vehicles sold in certain areas outside California which have an elevation above 4000 feet.
CAUTION: When performing tune-up on vehicles equipped with catalytic converters, do not allow or create a condition of engine misfire in more than one cylinder for an extended period of time. Damage to converter may occur due to loading converter with unburned air/fuel mixture.
CAUTION: On vehicles equipped with catalytic converters, do not add fuel system cleaning agents to fuel tank or carburetor as their use may be detrimental to the catalytic converter.
CAUTION: Before making a compression test or cranking engine using a remote starting switch, disconnect coil wire from distributor and secure coil wire to a good ground.