gap on plug closed inside combustion chamber

35

Asked by 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?

4 Answers

75

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

1 of 1 people found this helpful.
35

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

66,045

Because of using lower octane fuel severe denotation may have damaged the plugs. You should be using iridium spark plugs as well. They'll last 100,000 miles. That could also be the problem. HTH. -Jim

1,415

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

Your Answer

Add photo

Related Questions

  • Coolant Disappearing 2 answers

    So I replaced the plastic elbows that run to the tensioner about 3-4 months ago. I'm still going through coolant. I've gone through 3-4 gallons since then. No visible leaks. We originally thought t...

    2007 Pontiac Grand Prix GT

    -

    Maintenance & Repair

  • What makes the supercharged gtp engine better than a non-supercharged engine? 15 answers

    what makes the supercharged GTP engine better than the non-supercharged 3.8 liter 252hp engine on the G6 GTP Pontiac for 2007?What is the reasoning for the Eaton Supercharger?. dougsherman2003@yahoo.c...

    2004 Pontiac Grand Prix GTP

    -

    General

  • 1992 pontiac grand prix Richard Petty Edition 3.4l v6 78000 original miles 2 answers

    I have a 92 gp that i got from my aunt (family owned most of its life) and it wont start. Shop (that i dont trust) said my internal drive chain (they said car has a timing belt and chain) broke so it ...

    1992 Pontiac Grand Prix

    -

    General

  • cylinder misfiring 1 answer

    Hooked my car up to an electronic reader and it said 6 cylinder misfire. I change the spark plugs out and the ignition coil. I don't know what to do. Someone told me I might need an egr valve. I ...

    2004 Pontiac Grand Am GT

    -

    Maintenance & Repair

  • 2000 grand am 2 answers

    The keeps leaking into the spark plugs what is wrong with it , what do I have to do to repair it? Can someone please help!

    2000 Pontiac Grand Am SE

    -

    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,871 nationwide Grand Prix listings starting at $900.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 4,160
#2 Tom Demyan
Tom Demyan
Reputation 2,830
#3 munron
munron
Reputation 2,180
View All

Related Models For Sale

Used Chevrolet Impala
521 Great Deals out of 31,726 listings starting at $1,450
Used Pontiac Bonneville
3 Great Deals out of 533 listings starting at $1,799
Used Pontiac Grand Am
1,215 listings starting at $1,999
Used Chevrolet Monte Carlo
21 Great Deals out of 1,408 listings starting at $1,995
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Chevrolet Malibu
948 Great Deals out of 79,664 listings starting at $1,500
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford Taurus
246 Great Deals out of 20,434 listings starting at $699
Used Honda Accord
813 Great Deals out of 84,287 listings starting at $1,050

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
18 Great Deals out of 429 listings starting at $1,500
2007 Pontiac Grand Prix For Sale
4 Great Deals out of 392 listings starting at $2,500
2006 Pontiac Grand Prix For Sale
456 listings starting at $2,675
2005 Pontiac Grand Prix For Sale
5 Great Deals out of 351 listings starting at $1,895

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.