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1996 Pontiac Grand Prix stalling

Tiny
HVGMORE
  • MEMBER
  • 1996 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 15,000 MILES
You are driving along and it just stalls, it will not start right away, when it does start it is rough at first, like it is not getting enough gas, the fuel filter has been replaced
Monday, September 7th, 2009 AT 12:20 PM

9 Replies

Tiny
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  • MECHANIC
  • 109,885 POSTS
Has the check engine light come on? Have you checked fuel pump pressure? Let me know if you need directions.
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Tuesday, September 8th, 2009 AT 10:35 AM
Tiny
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The check engine light does not come on, there was a tune up done and plugs, wires, air filter and fuel filter were replaced, it runs fine mostly and then it will die, it won't start up immediately but will after a period, this morning it started after about 20 minutes, it started rough but then by working with the gas peddle I was able to get the revs up and then it ran great. I have not checked the fuel pressure, I have tools available to do that though, what would the precedure be? I also noticed that on the back side of the engine, around the mid point down about 4 inches there is a component that has what appears to be a vacuum line that is not hocked up to anything, what would that be and where should that line go?
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Tuesday, September 8th, 2009 AT 10:59 AM
Tiny
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As far as the vacuum line, I would need a picture to even begin trying to figure that out.

However, here is the how to for checking fuel pump pressure:

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Also, when it won't start, that is when to check the fuel pump pressure. I would also like you to check for spark to the plugs. Let me know what you find.
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Tuesday, September 8th, 2009 AT 1:25 PM
Tiny
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It wouldn't run again, there was spark and no fuel pressure
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Tuesday, September 8th, 2009 AT 6:19 PM
Tiny
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  • MECHANIC
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Chances are the fuel pump is bad. I hate to say it, but it is in the fuel tank. To access it, you need to remove the tank. Once you do that, make sure it is getting power before even removing it from the tank. If it is getting power, it needs replaced.

Let me know what you find.
Joe
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Tuesday, September 8th, 2009 AT 6:43 PM
Tiny
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I checked the fuse and it was good and with the key on when I put the fuse back in a could hear the relay activate, how do I check that power is making it back to the pump itself
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Tuesday, September 8th, 2009 AT 8:00 PM
Tiny
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You need to remove the pump to access the wiring to the pump. Not a fun job.
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Tuesday, September 8th, 2009 AT 8:50 PM
Tiny
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Update on grand prix: the car would not start yesterday, no fuel pressure, this morning I went out to see if there were any changes and turned the key on, the fuel pressure went to around 15 lbs, I started the vehicle, it started rough and took a couple of attempts but after I got the revs up it ran fine, also when it started the fuel pressure went up to 28 lbs. Could there be a vacuum leak or a problem with the pressure regualtor or are we still looking at the fuel pump itself?
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Wednesday, September 9th, 2009 AT 11:16 AM
Tiny
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If you are checking the pressure at the fuel rail, chances are the pump is the problem. Here is a way to check. It is a how to video and directions to check fuel pressure. It also includes checking the regulator. Let me know if it helps:

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
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Wednesday, September 9th, 2009 AT 11:49 AM

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