So my dad has a '02 grand prix N/A GT and a while back it would shut off while driving down the highway...sometimes it will crank back others it'll take up-most an hour til it fires back up...Basically it just dies...almost like its not getting fuel or sometype of power to fire the pistons...

I told him about this website and he wanted me to ask a few of you guys about this issue...

we orginally thought it was the fuel pump so he bought a new one and we installed it but last week it did it again...

any of you guys had this problem or know an easy around-the-house checks and maintaince?

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'06 GP GT S/C...20" chrome Alloy wheels, Kicker L7 Subs, 4-piece grille, white underbody lights, dvd/nav. , tint, custom chrome, custom FWI, 104 plugs... more coming...

Random stalling is usually caused by one of two things. Bad crank position sensor, or a bad ignition switch.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

I would lean more to the Crankshaft Position Sensor.

I guess one way to isolate it would be to ask if you have all your fan speeds on the HVAC and if you have had any trouble with the Accessories. If the ignition switch is failing I would expect something along those lines to show up.

To isolate it to the Crankshaft Position Sensor, the next time it dies and has trouble starting up, take off the #1 cylinder plug wire and put in a spare spark plug and ground it (They sell a test tool in the parts store for doing this) rather make sure the threads or the metal part is touching ground and try and start the car. If you have no spark it is most likely the CPS as that is a common failure item for the GP's. The CPS controls spark and also the tachometer. So if you are seeing your tach signal go to 0 on the dash, thats another indication that the CPS is bad.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!

Yeah, usually with the ignition switch the accessories will shut off with the engine (since the car thinks it was turned off) and come back on when you try to restart.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

k good suggestions...be sure to try these and see

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'06 GP GT S/C...20" chrome Alloy wheels, Kicker L7 Subs, 4-piece grille, white underbody lights, dvd/nav. , tint, custom chrome, custom FWI, 104 plugs... more coming...

we're going to try and change the crankshaft position sensor....can anyone please tell me where to locate it?

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'06 GP GT S/C...20" chrome Alloy wheels, Kicker L7 Subs, 4-piece grille, white underbody lights, dvd/nav. , tint, custom chrome, custom FWI, 104 plugs... more coming...

Theres a write up in the How To section that walks you through the process. The CPS is behind the crank pulley otherwise known as the harmonic balancer.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!

thnx syntheitic, the part is $36.99 at autozone...i'll show him the write up, first thing tomrrow...

http://www.grandprixforums.net/cps.php

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'06 GP GT S/C...20" chrome Alloy wheels, Kicker L7 Subs, 4-piece grille, white underbody lights, dvd/nav. , tint, custom chrome, custom FWI, 104 plugs... more coming...