Trooper LS V6-3.5L (1998)
Spark Plug: Service and Repair
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Check the gap of all spark plugs before installation.
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Use a round wire feeler gauge to ensure an accurate check.
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Plugs installed with the wrong gap can cause poor engine performance and excessive emissions.
Installation Procedure
NOTE: The plug must thread smoothly into the cylinder head and be fully seated. Use a thread chaser if necessary to clean the threads in the cylinder
head. Cross-threading or failure to fully seat the spark plug can cause plug overheating, exhaust blow-by gases, or thread damage. Do not overtighten the
spark plugs. Over tightening can cause aluminum threads to strip.
1. Install the spark plug in the engine. Use the appropriate spark plug socket.
Tighten: Tighten the spark plug to 18 .m (13 lb ft.).
2. Install the coil module and spark plug boot over the spark plug.
3. Secure the coil module to the rocker cover with two screws.
4. Connect the electrical connector at the coil module.
5. Connect the negative battery cable.
