Plugs keep foulin!!!!!!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-13-2009, 12:58 PM   #1
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Default Plugs keep foulin!!!!!!!

I replaced my plugs and wires 2 or 3 months ago after my intake cracked and fouled all the plugs with coolant... and they fouled again.... replaced just the plugs and the oil, and it idled and ran smooth for about 500 miles and now there misfiring again!!!!(leading me to believe there fouled again) what causes this??? i'm so F'in tired changin plugs I need this fixed?

would seafoam help???

1995 SE 109,000mi
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Old 10-13-2009, 01:03 PM   #2
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Pull one plug and take a look.

If you got coolant in your oil, an oil change may not get it all out. Your idea about Seafoam might be the way to go. Put it in the crankcase, drive 500 (?) miles, and change your oil.
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Old 10-13-2009, 01:15 PM   #3
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yeah i would try that if that is not working then your head gasket is gone. if you keep getting antifreeze on the plugs then your gasket is gone but try the seafoam first to see what will happen.
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Old 10-13-2009, 01:30 PM   #4
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will the seafoam fix the plugs?? (longshot)
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Old 10-13-2009, 01:42 PM   #5
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Not sure. I'll let someone who has used it answer that. I can tell you that if you are using it to clean plugs you will have to add it to the top end through a vacuum line to the TB, in addition to putting it in the oil to clean out the gunk in there.
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Old 10-13-2009, 08:57 PM   #6
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Im assuming you havent fixed the cracked intake.
Fix that properly and all should be good.

Unless it is a head gasket. Then you have to fix that. I personally dont believe in fixes from a can.
There nothing more than a band aid to get from break down place to fix it place. Fix it right or scrap it.
Dumping crap from a can into it will only prolong the inevitable.
And possibly make the problem worse over the long run.
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Old 10-13-2009, 10:19 PM   #7
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First, it'* highly unlikely it'* a bad head gasket, so just put that out of your head.

I'm not the most familiar with the non supercharged version. But I do believe there is a problem with where the EGR tube heats up and causes a leak of the coolant in to the throttle body. Try removing the throttle body and look in to the opening. Do you see any coolant pooled up in there? If so, that'* the cause of your fowled plugs.
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Old 10-14-2009, 01:01 AM   #8
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I wish i knew how to pull the throttle body off... but the intake manifold is brand new and done by a mechanic... any seafoam naysayer need to do some reasearch
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Old 10-14-2009, 08:02 AM   #9
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I don't believe seafoam will help. Even a pro can make a mistake. Have you checked your coolant level? If it'* going down then your leaking in to the engine.
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Old 10-14-2009, 09:09 AM   #10
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Most likely the UIM or upper intake manifold is bad. Have you verified it is a new piece? If so, it'* possible the gasket or manifold are bad. The typical failure is an old upper manifold that has cracked in the EGR tube area.
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