1995 Pontiac Grand Am Car runs rough and fuel gage

IDAHOTARHEEL

MEMBER
1995 PONTIAC GRAND AM
4 CYL
2WD
AUTOMATIC
135,000 MILES

1. After the car is started and ran for about 5 min the engine spits and sputters and the car jerks severely and loses power. Giving more gas increases the jerking. Sometimes it will go away very quickly and sometimes it may last for 5 min.

2. Fuel gage on car would not go lower than 1/4. Now the indicator jumps around.
Related?

Changed spark plugs, checked compression, replaced throttle position sensor and fuel filter.

3 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

Is this Quad 4? If so they had problems with the coil housings causing cross-firing and thus engine misfires. The fuel gauge is probably not related, to ensure good fuel pressure a manual gauge must be installed to verify

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Friday, September 12th, 2008 AT 7:49 AM

IDAHOTARHEEL

MEMBER
2 POSTS

Thanks. Is there anyway to check the coil housing other than replacing it? This has 2 coil packs that mount to the underside of a metal plate which sits on top of the spark plugs.

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Friday, September 12th, 2008 AT 9:36 AM

MMPRINCE4000

MECHANIC
8,549 POSTS

Most shops can measure coil output, but you can hook up a inductive timing light and pull the trigger, do this for each wire. You would be looking for pauses in firing pattern from one coil to another.

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Saturday, September 13th, 2008 AT 6:04 AM