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Kevbz 03-04-2012 12:49 PM

spark plug swap at 170,000 miles
Gonna do a bit of maintenance today and curious about the plugs. Jeep has almost 170,000 and i can tell they are not OEM, so they have been changed at least once, but I got the jeep at 161,000 so when would be the question! Everything with threads on this jeep have fought me all the way so any tips on a error free removal? Is it better to get it hot first so the block is a bit more forgiving on its grasp, or go at it cold?

Jerry Bransford 03-04-2012 01:30 PM

I never change plugs on a hot engine, just pull them cold. Apply just a small smidgen of antiseize to the new plug's threads so they will be assuredly easily removed the next time. Too much antiseize is bad news since it can get on the spark plug's electrodes which will wreak havoc with their performance.

Kevbz 03-04-2012 01:38 PM

thank you, appreciate the advice!

Mom sold the Jeepster 03-04-2012 02:54 PM

If you remove bolts or spark plugs while hot the shape will change as it cools without its mate. It may be impossible to get the bolts or plugs threaded back in without re-tapping. I learned the hard way trying to hurry up and change brake pads on her minivan. Ended up having to re-tap the calipers and the mounting bolts. Lucky for me, a buddy had a fancy tap and die kit. He still teases me about it and so does his wife. "Hey will you do my brakes"?

Goes without saying that re-tapping an engine block at the cylinder head is way more totally gonna ruin your week and your paycheck.

Kevbz 03-04-2012 06:45 PM

all was well when I pulled them this afternoon. I did notice that the gap was way off on all of them compared to each other and the new ones I gaped at .035. I am idling with a bit more fluctuation (used to stay steady at 750-800 rpm, now about 850 with a noticeable fluctuation between 750-850) than before the change. Is this related to the ECM relearning the spark advance and retard of the newer plugs?

Jerry Bransford 03-04-2012 06:56 PM

What brand and model plugs did you install and what engine/model year do you have?

Kevbz 03-04-2012 07:56 PM


Originally Posted by Jerry Bransford
What brand and model plugs did you install and what engine/model year do you have?

It's a 99 2.5L, with distributor. Champion 3034/RC12PEC5 plugs

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