gap on plug closed inside combustion chamber
35

Asked by Monte Dec 28, 2013 at 03:10 PM about the 2002 Pontiac Grand Prix GTP Coupe

Question type: Maintenance & Repair

On two separate occasions my car started missing because the electrode was sitting
on the firing pin. The second time it happened after a hard acceleration. It has 183000
on it. Previous owner installed a performance kit at 35000 with a smaller supercharger
pulley. I have put only 4000 miles on it in two years. Now lifters are ticking and maybe
a rod banging. I just found out i should have been using 91 octane. Is a piston hitting
the plug? Im assuming the engine is junk . Is a used engine with 100k on it worth
1300?

3 Answers
105

dallas2789 answered 10 years ago

I would suspect someone put the wrong plugs in it . always use the factory recommended plug.

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35

Monte answered 10 years ago

had NGK TR6, I put in Autolite5245 its happened with both type plugs. I would think that if plugs were too long all 6 of them would be hit

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2,335

Paul answered 10 years ago

Piston hitting the plug is likely what you have going on. Im with you likely a junk motor at this point. Id look for a shorter plug or try double washers to try to get a few more miles out it

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