My 2002 Grand Prix SE 3.1 Wont start

105

Asked by Dec 11, 2013 at 07:54 PM about the 2002 Pontiac Grand Prix SE

Question type: Maintenance & Repair

My car wont start. I have replaced the fuel filter, ignition control modeul, and coil pack, both crank censors, spark plugs and wires. She acts like she wants to start but wont.. Any ideas?

46 Answers

72,415

Is the fuel pump coming on? Remove the gas cap and have a helper turn the ignition on but don't try to start it. Put your ear close to the fuel filler and you should hear the fuel pump run for about 3 seconds. If it runs, based on what's been replaced, I'd do a compression test. If all cylinders test low, it's jumped timing. HTH. -Jim

2 of 2 people found this helpful.
105

Yes the fuel pump is coming on and the car had great compression ..now the car starts after the battery has been unplugged for a while and runs great but as soon as you shut the car back off it won't start until the battery has been unplugged for a bit

1 of 1 people found this helpful.
105

The car has* great compression

72,415

Could be a computer problem. By disconnecting the battery the PCM (computer) is cleared. Does the service engine soon light come on? Can you get any trouble codes out of it? -Jim

1 of 1 people found this helpful.
105

It came on once but isn't now. We had a code come up the first time and it said it was the crank position censor, that got changed. It is now not throwing any codes. My dad and I were wondering about the computer too.

72,415

Unfortunately that's what it sounds like to me as well. The ignition components that normally fail when they get hot (coils, control module) have been replaced. You're getting fuel as well. When it refuses to start do you have spark? -Jim

105

Yes. A new computer doesn't cost to much if that's the problem. I appreciate all of your help. :}

1 of 1 people found this helpful.
105

I just want my car going again lol it's been over a month

1 of 1 people found this helpful.
72,415

You're welcome. Glad to help. Yes, a month without a car is a long time!! -Jim

1 of 1 people found this helpful.
Best Answer Mark helpful
105

What would make my tac not work while the car is running??

2 of 2 people found this helpful.
72,415

I'd suspect the crankshaft position sensor. Especially if your "track off" light remains on. HTH. -Jim

1 of 1 people found this helpful.
105

We just change that we're hoping that works

105

UGG this dam car

72,415

I actually read a thread on another site about the tach not working. Seems the crankshaft position sensor will sometimes work ok until it gets hot. Then apparently it opens and stops sending the signal to the computer. It's actually a two part sensor. The engine can run with one signal from the sensor but not without any signal from the sensor. HTH. -Jim

105

We have actually replaced both crank sensors and the tac still doesn't want to work?

72,415

Hmmmmm, could be a bad connection at the plug behind the instrument cluster. Or the instrument cluster itself. -Jim

105

Well I ordered a new computer for it today I will look under the dash tomorrow and check that out

1 of 1 people found this helpful.
72,415

Ok, remember that the new computer will have to be flashed using your vehicle identification number for it to work. -Jim

105

If I get it out of a car that's a 3.1 and has the same features as mine does it doesn't have to be flashed. I've already talked to a couple mechanics and a GM dealer :) :)

72,415

Ok cool. That makes things easier. - Jim

72,415

Did some more research into the tach. The white wire at the plug that plugs into the ignition control module is for the tach. HTH. -Jim

105

Thank you very much. I will check that out. :)

105

So the car starts and runs for the most part. Will that wire make it cut in and out?

105

Because my tach still isn't working

72,415

You're welcome. I'm not sure. I'll look into it further & see if GM issued any service bulletins (TSBs). -Jim

1 of 1 people found this helpful.
105

When I turn the ignition on and off the tach bounces but once the car has started the tach doesn't work

145

sounds like the passlock security system is actging up sometime they can just reprogram something but other times its a new ignition cylinder and key that has to be coded try leaving the key in the on position for exactly 30 mins then turning it over , if that doesnt work try locking and unlocking the drivers door with the key physically not with the fob

1 of 1 people found this helpful.
145

and in 2002 gm put out a whole bunch of bad gauge cluster for cars with the same drivetrain if you get one out of a newer car it will fit but it probably wont look the same "tachometer"

145

2000 thru 2004 works, 2005 looks the same but way different

105

What is a fob? The car starts now just after it warms up it starts running rough and the tach doesn't work. My dad thinks it maybe just the computer. I ordered one, just waiting for it to get here.

72,415

The fob is the remote control "clicker" that locks/unlocks the doors and trunk. Have you checked the wiring at the crankshaft sensor? I've read several threads on other sites where people have had the same issues as you. They've traced the trouble to the crankshaft sensor and/ or it's wiring. HTH. -Jim

105

I don't have a remote.. I will have my dad check the crankshaft sensor/ wiring to it..

1 of 1 people found this helpful.
105

Both crank censors have been replaced

72,415

But it could be a problem with the wiring. When things get hot they expand and sometimes loosen up. -Jim

105

I hope its not. I hope the new computer fixes the problem. If not I can't afford anymore parts and I will be with out a car again. ugg :(

10

return the computer. unplug the battery and plug it back in, then turn the key to the on position and DO NOT start the car, shut it off and back on 10 times to reprogram the original computer and the car will not die. the reason why the car keeps shutting down is because of the security system thinks someone is trying to steal the car and the computer overrides. now for the tach not working properly, pull the crank sensor out and crank the motor by hand and see if it is getting a good connection.

1 of 1 people found this helpful.
145

yeah these cars have a couple really common problems like the passlock security systems , all the buttons ALL of them go bad , the engine and tranny mounts , the wheel bearings can only take a year of serious driving , the back shock and struts get whooped ! the fuel sending unit is faulty and theres a access panel under the back seat you cut out to get to it , the power steering pump dies the car will finally die when the upper and lower go out oh and if the transmission hasnt started kicking go get a fluid flush and filter change while it you still can

105

Not returning the computer. I can't. The problem is either behind the dashboard wiring or the battery. The car starts and rubs great. The tach acts up and the car acts like it has a miss when it's in drive and reverse other than that its a great car and I've had no other problems with it.

1 of 1 people found this helpful.
105

Ok, so we figured out the issue in my car. You all were wrong. There is a bundle of wires that go to the computer and other stuff that was rubbing up on the AC Condencer and the wires rubbed raw. They got fied and the car runs GREAT!!!!

1 of 1 people found this helpful.
72,415

Thanks for letting us know. Glad to hear you're back on the road! Happy New Year! -Jim

105

Your welcome and thank you for your help. Happy New Year to you as well :)

1 of 1 people found this helpful.
145

sweet !

10

I have a 2002 pontiac grand prix it won't start. It makes a tic noise it ran great yesterday morning. I have no clue were to start Ithought it was the battery but its not Ijust got the car two weeks ago

1 of 1 people found this helpful.
72,415

Switch on the headlights and try to start it. Do the headlights stay nice and bright? If so it's most likely the starter. Also try this, shift into neutral and try to start it. If it starts your neutral safety switch is most likely bad. If the headlights dim or go out when you try starting it that's either a dead battery or a bad battery cable connection. HTH. -Jim

1 of 1 people found this helpful.
30

I have a 2000 pontiac grand am 3.1l I have replace both crankshaft sensor, harmanic balancer, coil packs, module, spark plugs and wires..the car still wont crank im not getting any fire..it cranks sometimes but after about 30 min it will turn itself off..anybody have an idea what can it be?

3 of 3 people found this helpful.

My 2001 Pontiac Grand Prix isn't getting Fire...please any help is needed

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