Thread: Pontiac grand prix broke down

I fixed a GP that had the same issue, it turned out to be the ignition switch... It's really easy to swap out, takes about 15-20 mins.

But I'd check all the grounds and fuses first.

Ever done the crank sensor?

Sounds like it coulda been that.

Originally Posted by fremmy182

well i replaced the fuel pump because it wasnt turning on and had no fuel pressure when i tried starting, but that didnt do anything, all the fuses and relays work. time to try some more things.

It's most definitely the ignition switch like I said above.

heres one that been around for a while. it says 2000 gp, but i dont think year matters all that much. Sparky's Answers: 2002 Pontiac Grand Prix, Changing The Ignition Switch

I think your paint scheme embarassed it.

Originally Posted by fremmy182

and i hooked my old fuel pump to a battery and it STARTED, so mad about that. so it cant be the fuses, relays, ignition switch, or the fuel pump. whats next?

Fuel pump resister then...

Bypass it by pulling out the relay, bending the pin then putting it back in as shown in this picture:
relays.jpg

Originally Posted by fremmy182

I guess I have to use process of elimination

If I could give you a beer for suggesting that, I would.

Well, your story was a bit confusing. You are saying you had battery level voltage and that's why you shouldn't check the basics, like battery cables. This makes no sense to me. Let me explain why, you can leave the grounds unhooked on the transmission and you'll have power of 12V to the car. The minute you turn the key and aim for power, you'll know something is wrong.

You shotgunned a pump into the car w/o testing for power at the pump's connector. Heck, you still haven't tested for a full 12V at the connector. It's a simple thing to pull the trunk carpet up and remove the hatch. Then check power to the pump. Work your way back if you don't have power.

The fuel pump resistor is a bad suggestion, because when it's bad, you'll get fuel pump prime and nothing else under 70% throttle. High speed pump relay is used for priming and above about 70% TPS. Key in mind that when you turn the key from off to on, your pump is run in high speed for about 2 seconds, then it will not run again until the engine starts.

Have you had issues with the fuel gauge working? Maybe toss another gallon of fuel into it if you ever saw flaky behavior.

Could your fuel filter be old and clogged?

Honestly the lights flickering, just means the car didn't stall instantly, it likely fluttered for a moment.

There are a lot of basic things you need to go check and start ruling out one by one.

you need to test to see if the injectors are getting power.

could be a pcm, but im no electronic wiz.

im told you can stick a head light side marker bulb into the injector plug, if it flashes its getting power. i used a test light to test mine in the past tho.