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I jack up the front end and support vehicle with jack stands then remove drivers side wheel. Using a standard 3/8" drive 5/8" spark plug socket and a 3/8" drive 10" (or longer) wobble extension, go thru the inner fender opening and slip socket on to number 3 spark plug first then attach wobble extension and ratchet. I do this on both sides to R&R all the spark plugs.

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7y ago
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14y ago

There is a special socket that the Snap-On tool truck has it is a short thin socket that has a offset on it to attach your 3/8 extention to.

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Q: How do you change the 3 cylinder spark plug in a 1999 GMC Jimmy?
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