Spark Plugs

Ed Blown Vert · April 2, 2005

Before I start pulling things off. Where are the plugs??

Envoy Fan · April 2, 2005

Before I start pulling things off. Where are the plugs??

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Um, I think you have to take the cover off that says Vortec 4200. Also, each plug has some kind of electronics attached to it.

You got 100K miles already?

Envoy Fan · April 2, 2005

Before I start pulling things off. Where are the plugs??

<{POST_SNAPBACK}>

Um, I think you have to take the cover off that says Vortec 4200. Also, each plug has some kind of electronics attached to it.

You got 100K miles already?

<{POST_SNAPBACK}>

From Al on another forum

Turn OFF the ignition switch.

Remove the ignition coils. Refer to Ignition Coil(s) Replacement .

Notice

Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.

Notice

Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.

Remove the spark plugs from the engine.

Installation Procedure

Notice

Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.

Notice

Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the engine.

Measure the spark plug gap on the spark plugs to be installed. Compare the measurement to the gap specifications. Refer to Ignition System Specifications . Correct as necessary.

Notice

Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage.

Install the spark plugs to the engine. Tighten

Tighten the spark plugs to 18 N·m (13 lb ft).

Install the ignition coils. Refer to Ignition Coil(s) Replacement .

This is from the manual, the only thing I can't understand is they don't talk about Anti-Seize and if it's aluminum you need it or the plug will never come out again without stripping the thread, I always use Anti-Seize now no matter what, and I never had to repair a plug hole since.

They actually sell Anti-seize now in a small pouch and one pouch will do up to 8 plugs, cost about a buck or two.

The pouch is similar to those ketchup enveloppe you get at fast food restaurant.

Thanks to Al