1997 Pontiac Grand Prix Fuel pump or?

Tiny
HAWKS525
  • MEMBER
  • 1997 PONTIAC GRAND PRIX
Engine Mechanical problem
1997 Pontiac Grand Prix 6 cyl Automatic 114000 miles

Hello,
I have been having problems with my car and no sure diagnosis yet.
1. The first sign something was wrong was when my car would not start. The key got locked in the ignition and my car had to be jumped before I could get it loose or the car would run.
2. The next day my car struggled to start, but eventually worked.
3. The next 2 days my car started up fine like nothing every happened.
4. The third day my car would not start again. The key would turn but the engine would not fire. It was jumped a few more times to get it to run.
5. Now, 9 times out of 10, when I start my car, it will die unless I keep my foot on the gas pedal and rev it up for several seconds. Sometimes when I do this, my car will start bouncing, but it will die if I do not do this. Sometimes the lights will dim.
6. I took it to a Pontiac dealership to get it checked out. They noted the car would start every time. They hooked it up to the machine and said they found it could be something w/ the fuel pump, and that when something hits in the right place, it would cause a no-start condition. (If you want me to get the exact wording, I can find the document and give you that). They told me they are 99% sure if they replaced the fuel pump, it would run, but what about that 1% they could be wrong?

-Could it be the fuel pump?
-Could it be bad gas?
-Any other ideas?

Thanks so much for your help - it is greatly appreciated!
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Monday, September 22nd, 2008 AT 6:37 PM

11 Replies

Tiny
RASMATAZ
  • MEMBER
Check the fuel pressure and idle air control valve and the EGR valve-
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Monday, September 22nd, 2008 AT 6:47 PM
Tiny
HAWKS525
  • MEMBER
In the mechanics comments, he wrote "good fuel pressure" when he warmed engine up to hot soak
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Monday, September 22nd, 2008 AT 7:27 PM
Tiny
RASMATAZ
  • MEMBER
Is he just saying that or its coming out of a fuel pressure gauge-I need the readings before we can continue for some reason I don't trust him, you sure he's not a partschanger or a detailer in that dealership.
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Monday, September 22nd, 2008 AT 8:21 PM
Tiny
HAWKS525
  • MEMBER
A few people have said they didn't trust him.
He is supposed to be a mechanic but who knows. They charged me $100 just for looking at the darn thing!

I just dont' want them putting in a new fuel pump if they are not 100 percent sure that's what it is. I would still owe 600 for them to do that.

Is it possible it could just be bad gas?

I don't have the readings so I guess I'm not helping much.
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Monday, September 22nd, 2008 AT 8:26 PM
Tiny
RASMATAZ
  • MEMBER
Okay I understand where you coming from-do this I want you to cycle the key on and off 3X within 2 mins apart-do you hear the fuel pump come on everytime you put the key in run-listen to the fuel pump whether its coming on-might be the ignition switch. Let me know
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Monday, September 22nd, 2008 AT 8:34 PM
Tiny
HAWKS525
  • MEMBER
Ok, I did what you said but I'm no expert with cars. I believe I heard the fuel pump come on each time I turned the key. It's just that it won't fire up all the way unless I put my foot on the gas. I just don't get it. If it was a fuel pump, why would it run fine as soon as I get it started?
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Thursday, September 25th, 2008 AT 5:14 PM
Tiny
RASMATAZ
  • MEMBER
Check the fuel pressure and comeback with the readings so I can evaluate this is where we continue
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Thursday, September 25th, 2008 AT 9:15 PM
Tiny
HAWKS525
  • MEMBER
Ok, I called the dealership and asked for the fuel pressure readings. I left a message so I wasn't really sure what to ask for. Is there some exact wording I could ask him so I don't sound clueless? What exact readings do you need so I can be sure I am getting you the right info.
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Friday, September 26th, 2008 AT 5:19 PM
Tiny
RASMATAZ
  • MEMBER
3.L fuel pressures-41-47psi

3.8 fuel pressures-48-55psi
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Saturday, September 27th, 2008 AT 4:06 AM
Tiny
HAWKS525
  • MEMBER
Exact wording of dealership. He left a message on my voicemail:

"Fuel pressure was 52 psi. The scope pattern is what showed that the pump motor was open in the armature. That's why we were going towards the pump."
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Tuesday, September 30th, 2008 AT 6:07 PM
Tiny
RASMATAZ
  • MEMBER
Earlier they said good fuel pressure-now they used a lab scope and found an open circuit in the fuel pump if it does then its no good.
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Tuesday, September 30th, 2008 AT 7:20 PM

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