service engine soon and trac light come on embed go off at random

Asked by Jul 08, 2012 at 04:43 AM about the 1999 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

I've got a 99Pontiac grand am the trac light and service engine soon light come on and will go off and on and of
randomly. When they come on the car idles really rough, the car vibrates and shakes, three car when stopped
sometimes refuses to speed up and move, I've replaced the ignition coil the spark plugs and the wires the fuel find
the lights still come on and off. Since the fuel filter change its been driving much better and three idler is no where
near as bad, barley now but the lights still come on. On the car MD the code 304 comes up for a misfire on the 4th
cylinder just as randomly. It shows when the lights see on, and after a few passes on the MD the lights clear snag
the car drives like a dream, need advice

4 Answers


The Trac light means the ABS system is disabled, so this is usually caused by a faulty wheel sensor, have it check by a local mechanic. A code P0304 may mean that you have a clogged injector on that cylinder or when you replaced the parts the plug wire isn't seated properly on the coil or plug, did you use dielectric grease on the boots of the wires?

3 of 3 people found this helpful.
Best Answer Mark helpful

Im not sure if they did, or not.


The service engine and Trac are on the same circuit to make you think it needs asap service at the dealer p0304 is cylinder misfire detected low fuel pressure, can produce this code, oh foot note p0304 is a random misfire affecting all cyls randomly. If it gets worse warm look at sensors, fuel pump is a very good place to start.

2 of 2 people found this helpful.

I have a 2004 Pontiac Grand Am same problem abs service engine soon light come on and it comes off And Trac off light

1 of 1 people found this helpful.

Your Answer

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 756 nationwide Grand Am listings and the tools to find you a great deal.


Pontiac Grand Am Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Tom Demyan
View All

Related Models For Sale

Used Pontiac Grand Prix
1,896 listings starting at $3,000
Used Pontiac Firebird
5 Great Deals out of 656 listings starting at $4,999
Used Ford Mustang
294 Great Deals out of 38,680 listings starting at $1,995
Used Chevrolet Malibu
635 Great Deals out of 48,779 listings starting at $1,500
Used Chevrolet Camaro
257 Great Deals out of 30,437 listings starting at $4,200
Used Chevrolet Impala
370 Great Deals out of 27,549 listings starting at $1,499
Used Chevrolet Corvette
100 Great Deals out of 15,822 listings starting at $4,500
Used Honda Accord
565 Great Deals out of 92,879 listings starting at $1,495
Used Pontiac Bonneville
342 listings starting at $2,000
Used Nissan Altima
816 Great Deals out of 68,085 listings starting at $750
Used Honda Civic
391 Great Deals out of 52,304 listings starting at $1,200

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.