spark plug question (93 SE) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-21-2007, 01:10 PM   #1
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Default spark plug question (93 SE)

I'm out working on my car trying to figure out why it sounds like it has a misfire, idles rough, and gets horrible mpg. I've got the coils off about to be tested when i find my multimeter. Just for the heck of it, I pulled the plug out of the cylinder that is farthest to the right in the back, and it has gone from a gap of .060 to .082 in just over 20,000 miles. There is hardly any tip left on the spark plug. Pics are coming in a minute. Does this mean i need new plugs?
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Old 07-21-2007, 01:12 PM   #2
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It could. Or it could mean you've got knock. What type of plugs are they, and what did you gap them to?

Pull all 6 and inspect the gaps and colors. Post pics of the plugs.
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Old 07-21-2007, 01:17 PM   #3
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i made a mistake...my gauge is old and hard to read. they are still off gapped, but not that bad. going to recheck now. (and remember my kr vs ks post) where I had 4* of KS...
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Old 07-21-2007, 01:19 PM   #4
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Yes you need new plugs.

Does it look like normal wear and not pre-ignition or detonation?

20000 mile would be good on copper but I'd expect at least double on platinums.
Stay away from Bosch +2 and +4 plugs, They do not work well in our type of spark system (Waste spark) and will die in short time.
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Old 07-21-2007, 01:22 PM   #5
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ANY Bosch plat, not just the 2/4 varieties are bad in our cars.

4 KS COUNTS, not degrees. That'* nothing. Most cars here will see a count or two on the way to the grocery store.
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Old 07-21-2007, 01:27 PM   #6
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ok...spark plugs not as bad as i first thought. I made a newbie mistake on the measuring combined with a hard to read guage and completely mis-added the total. I have autolite 605 platinums, and i know to stay away from bosch. thanks guys
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