1999 Pontiac Grand Am Car runs for a while and just shuts o

RNUCKOLS

MEMBER
1999 PONTIAC GRAND AM
6 CYL
FWD
AUTOMATIC
12,500 MILES

I have a 99 Pontiac Grand Am with a 3.4 in it. The car will run for about 45 minutes to an hour and will just shut off. It now seems to act like it is out of gas. You can start it back up and it will run for about 10 seconds and do the same thing again. It is not out of fuel, I have replaced the fuel pump, plugs, mass air flow sensor, map sensor, crank sensor. I am to the conclusion that it may be in the coil pack area or the bcm but would like other opinions or options. Thanks

Friday, September 24th, 2010 AT 4:27 PM

1 Reply

ERNEST CLARK

MECHANIC
1,730 POSTS

The first thing to do is STOP chasing the problem by spending money. This never works! Have a part tested before you replace it.

If the car is shutting down in the middle of a drive cycle, then you should be getting a code. Have the computer scanned. AutoZone or Napa will do this for free, as well as provide you with the definitions.

If the code points to a specific part, have it tested first, because a code doesn't mean the part is bad, only that there's a problem in that area. It could be the wire/connector, etc.

If you aren't getting a code, check the fuel filter as well. Also check for the wiring/connectors leading to and from the coil packs. You could check the coils as well once they get hot, because sometimes they will fail only when too hot.

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Saturday, September 25th, 2010 AT 5:04 PM