missfire#1 cyl.

365

Asked by Jun 14, 2011 at 01:34 AM about the 1992 Pontiac Grand Prix 2 Dr GT Coupe

Question type: Maintenance & Repair

92 grand prix 3.4l missfire #1 90psi all other cyl range 140-150psi i did a leak down and all cyl. were 10-15% even #1 no  indication of blown head gasket. pulled the head and looking at the valves in all cyl. they seam to be burning equal in all cyl.  pluges look good as well.pluges and wires are new fuel is not bad, no water or fuel in the oil. the cyl. has no scare or scrape either. pulled the piston and no broke or stuck rings. so why do I have a missfire and low compression on #1.  before you answer 1&4 share the same coil for ignition and #4 is fine. pluse no codes.

2 Answers

365

Well im gonna be honest. If you have the means to do so. Sell that car ASAP! That 3.4L LQ1 is a time bomb waiting to go off. either that or replace the engine with a 3.1. Head gaskets are alot cheaper than motors

365

thanks for the input. I finally pulled the head and come to find out the cylander is coned. which explanes bad compression but good leak down and excessive crankcase pressure.

Your Answer

Add photo

Related Questions

  • missfire#1 cyl. 2 answers

    92 grand prix 3.4l missfire #1 90psi all other cyl range 140-150psi i did a leak down and all cyl. were 10-15% even #1 no indication of blown head gasket. pulled the head and looking at the valves in...

    1992 Pontiac Grand Prix 2 Dr GT Coupe

    -

    Maintenance & Repair

  • missfire on #3 1 answer

    replaced spark plugs and wires the first time the check engine light came on three months later the same light came on with the same reading missfire on number 3.

    2000 Pontiac Grand Prix GTP

    -

    Maintenance & Repair

  • Miss fire cyl 6 1 answer

    So I bought this car it seemed fine I took off the exhaust being the resonator and since then I've noticed it missfiring on cyl 6 I've replaced the spark plug and have ran injector cleaner through ...

    1998 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

    -

    Maintenance & Repair

  • Someone have 1 Instrument Cluster Gauge Speedometer for pontiac grand prix STE 1990 ? 1 answer

    i've a pontiac grand prix STE 1990 but my Instrument Cluster Gauge Speedometer stopped working. I search to buy a new one but i couldn't find one (in lebanon) so please if one of you have 1 contact ...

    1990 Pontiac Grand Prix 4 Dr STE Sedan

    -

    Maintenance & Repair

  • Will a 1 in core radiator fit in a se Grand Prix

    I'm trying to see if a 1 in core radiator will fit in a SE Grand Prix

    1997 Pontiac Grand Prix 2 Dr GTP Supercharged Coupe

    -

    Maintenance & Repair

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 4,350
#2 Tom Demyan
Tom Demyan
Reputation 2,940
#3 munron
munron
Reputation 2,290
View All

Related Models For Sale

Used Pontiac Bonneville
3 Great Deals out of 529 listings starting at $1,799
Used Ford Mustang
701 Great Deals out of 44,787 listings starting at $1,500
Used Pontiac Grand Am
1,126 listings starting at $1,000
Used Chevrolet Camaro
358 Great Deals out of 31,416 listings starting at $2,400
Used Pontiac Firebird
13 Great Deals out of 756 listings starting at $2,995
Used Nissan Maxima
331 Great Deals out of 24,430 listings starting at $1,999

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
13 Great Deals out of 405 listings starting at $2,499
2007 Pontiac Grand Prix For Sale
367 listings starting at $5,499
2006 Pontiac Grand Prix For Sale
7 Great Deals out of 458 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
4 Great Deals out of 363 listings starting at $2,350

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.