Ignition System: Service Precautions

IGNITION SYSTEM SERVICE PRECAUTIONS
^ Allow engine to cool before removing spark plugs. Attempting to remove spark plugs from a hot engine may cause spark plugs to seize, causing damage to cylinder head threads.

^ Clean spark plug recess area before removing spark plug. Failure to do so can result in engine damage due to dirt or foreign material entering cylinder head, or in contamination of cylinder head threads. Contaminated threads may prevent proper seating of new spark plug.

^ Use only the spark plug specified in Application and ID. Spark plug gap must be checked using a "wire-type" gauge before installing into engine. Refer to Spark Plug/Specifications for correct gap.

^ The tachometer terminal must never be allowed to touch ground, as damage to the Powertrain Control Module (PCM) and/or ignition coil can result.

^ The material used to construct spark plug wires is very soft. This wire will withstand more heat and carry a higher voltage, but chaffing and cutting become easier. The spark plug wires must be routed correctly to prevent chaffing or cutting. See Spark Plug Wire/Locations for routing. When removing a spark plug wire from a spark plug, twist the boot on the spark plug one-half turn while pulling on the boot.