Spark Plug sometimes bad? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-03-2006, 03:09 AM   #1
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Default Spark Plug sometimes bad?

Well today after some thought about the wierd misfire or loss of power I was getting ONLY at WOT, I looked at what I have done recently

Spark plugs
Wires
Cat converter
vaccum hoses
TOO MUCH fuel injector cleaner



Well swapped my new NGK plugs back to the delco platinums that came with the car and the problem MAY have magically disappeared, I have not been able to reproduce the problem in the past hour of driving the car...It was really acting like it was not receving enough fuel but it may have been a sparkplug that was acting up, only sometimes.

Keep in mind I reseated all the spark plug cables before as well and the problem persisted

Anyone ever have an intermittent problem with a spark plug? It was only sometimes and only at WOT.
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Old 05-03-2006, 09:54 AM   #2
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Default Re: Spark Plug sometimes bad?

Quote:
Originally Posted by Hans
Well today after some thought about the wierd misfire or loss of power I was getting ONLY at WOT, I looked at what I have done recently

Spark plugs
Wires
Cat converter
vaccum hoses
TOO MUCH fuel injector cleaner



Well swapped my new NGK plugs back to the delco platinums that came with the car and the problem MAY have magically disappeared, I have not been able to reproduce the problem in the past hour of driving the car...It was really acting like it was not receving enough fuel but it may have been a sparkplug that was acting up, only sometimes.

Keep in mind I reseated all the spark plug cables before as well and the problem persisted

Anyone ever have an intermittent problem with a spark plug? It was only sometimes and only at WOT.
What NGK'* the 55'* ?????
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Old 05-03-2006, 10:37 AM   #3
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Default same experience

I had the same experience with the 96 SE. Gapped and put the Delco Platinums back in and skip went away. I think I'll keep them.
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Old 05-03-2006, 01:54 PM   #4
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Sounds like one might be cracked. Do any of them look like the problem cylinder?
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Old 05-03-2006, 05:30 PM   #5
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Originally Posted by BillBoost37
Sounds like one might be cracked. Do any of them look like the problem cylinder?
No physcial cracks whatsoever..


they look great. It has to be an internal problem or something I think. With the platinum (delco) plugs the car runs better....I just put some new plugs in today and it appeared to fix the issue however I put the platinum back in for smoother perofrmance I thought platinum were not good for supercharged applications it is all kinda odd.
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Old 05-03-2006, 05:37 PM   #6
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Cracks that cause issues are tyipcally in the core. Aka inside.
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Old 05-04-2006, 12:56 PM   #7
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Quote:
Originally Posted by BillBoost37
Cracks that cause issues are tyipcally in the core. Aka inside.
Or it may be too fine in the insulator to see. Without carbon scoring to trace the crack, finding a hairline crack in the insulator can be difficult.
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