Spark plugs are fouled again!!!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-19-2007, 03:40 PM   #1
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Default Spark plugs are fouled again!!!!

I recently changed my plugs 6 days ago from NGK'* to AC Delco copper'* and it ran excellent for 5 days. Now the car is driving like it use to, it takes to much throttle to get the car moving, lower mpg, and lost hp. I have the black and white chilton'* book which isn't doing me any justice for looking up my spark plugs. The NGK'* I took out are still gapped at .60, 3of them are in normal wear (black at the top of the metal case and kind of white at the side electrode.) and 2 of them have bit of carbon on them. The other one has noticeable carbon and it has a little oil on it, which is the probably the one giving me a misfire before. . Sorry I don't have a camera, but if any of this jumps out at you can you plz provide some info.

And I didn't just recover from a misfire after pulling those NGK'* out http://www.bonnevilleclub.com/forum/...946&highlight=

EDIT: Maybe a Rich air/fuel mixture is the cause of this??? Or a oil consumption problem???? Injectors????
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Old 07-19-2007, 10:33 PM   #2
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Is not an LIM gasket is a possibility also?
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Old 07-20-2007, 11:02 AM   #3
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Look up spark plug reading on Google, without pictures we aren't much help..therefore you must interpret them for us.

To be able to read a plug with only a few days on it..is quick. That means whatever your issue..it'* bad.
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Old 07-20-2007, 05:46 PM   #4
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I looked it up and all the other plugs seem normal except the 2 wit little carbon on them and the one with carbon and oil. The one with carbon and oil makes me think thats it'* a injector or cylinder, where ever that plug came from I won't be able to tell that until I pull these Delco plugs out. I'll up a pic in a minute.
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Old 07-20-2007, 06:12 PM   #5
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These pics aren't that good, but from left to right is the plug with carbon and oil on it, the next one has carbon on the tip of the metal case, and the last is a normal used plug with some tan dust or something on it.
http://pictures.sprintpcs.com//mmps/...ideo=true&wm=1

http://pictures.sprintpcs.com//mmps/...ideo=true&wm=1

http://pictures.sprintpcs.com//mmps/...ideo=true&wm=1
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Old 07-21-2007, 07:44 AM   #6
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The oil-fouled plug, my guess, is due to valve stem seal wear. Meaning no matter what you try, it will always foul until those seals are replaced. That'* easy enough to do on the car, but will require a compressed air source and a valve spring compressor.

When you removed these plugs, did you happen to note which plugs are paired to which coils?
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Old 07-21-2007, 12:33 PM   #7
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What the opinion on using spark plug Anti-foulers (Help# 42002/42009) until this can be repaired?
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Old 07-21-2007, 01:51 PM   #8
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I have no opinion on those. I've never used them myself. To me, it looks like they are designed to shroud the spark, and positions the plug almost to the point of being outside the combustion chamber.

A more appropriate bandaid, I think, would be to run a hotter plug on the cylinder that has the problem until he has the time to replace the stem seals. But that'* all my suggestion is...a bandaid.

I suggest a compression and leakdown test on all cylinders in the near future. That will determine whether or not a simple seal changeout or a complete teardown is in order.
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Old 07-21-2007, 09:08 PM   #9
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I'll have to note it when I pull these Delco plugs out. What type of good hot plugs are at the auto stores, if you know any? thanks for the info.
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Old 07-22-2007, 12:40 PM   #10
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Have you checked the resistance of the coil windings?
http://www.bonnevilleclub.com/forum/...e=article&k=33
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