Thread: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start

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  1. #1 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    I have a 2002 Pontiac grand prix 3.8 supercharged, that stalls out in the middle of driving after about 15 minutes. The engine will completely turn off and come to a stop. The air-conditioning, radio and everything else will still work. There is no check engine light. No codes. I replace the cam sensor, the crankshaft sensor, the ignition control module, and had my fuel line pressure tested. I will let the car sit for a while when I bring it to the shop and it starts right back up. But after driving it for a few days it stalls out again and I'm stranded on the side of the road. I brought it to the shop many different times already and there is no issue that is showing. When I try to crank the car it acts like it wants to start but will not turn over.
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  2. #2 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
    GrandPrix Junkie The Guz's Avatar
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    Maybe an IAC valve.
    1999 GP GT 18" Boss 353 Concave|SLP CAI|Borla Cat Back|Plog|HV3|HV TB|ER Rockers|Custom Retrofit Projectors|GMPP Lowering|GMPP Handling|MPD F1|Full Diode Dynamic LEDs
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  3. #3 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
    Killa Bee Scottydoggs's Avatar
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    crank sensor will do this, hardly ever sets a code either.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    I already replaced th crank sensor
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  5. #5 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
    Killa Bee Scottydoggs's Avatar
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    id you tq its bolt right? was it aftermarket?

    the little harness there goes bad too, icm to cam and crank sensor.s.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    My mechanic put on my crankshaft sensor so I think he would check the harness but I will call and make sure.
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  7. #7 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
    Killa Bee Scottydoggs's Avatar
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    Quote Originally Posted by GoBstoPpEr View Post
    My mechanic put on my crankshaft sensor so I think he would check the harness but I will call and make sure.
    find out what brand he used, the 3800 pretty much hates all aftermarket sensors. delco should be the first choice.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #8 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    It is the I purchase the part myself.
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  9. #9 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    It is delve I purchased the part myself
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  10. #10 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    Delco
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  11. #11 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    Quote Originally Posted by GoBstoPpEr View Post
    I have a 2002 Pontiac grand prix 3.8 supercharged, that stalls out in the middle of driving after about 15 minutes. The engine will completely turn off and come to a stop. The air-conditioning, radio and everything else will still work. There is no check engine light. No codes. I replace the cam sensor, the crankshaft sensor, the ignition control module, and had my fuel line pressure tested. I will let the car sit for a while when I bring it to the shop and it starts right back up. But after driving it for a few days it stalls out again and I'm stranded on the side of the road. I brought it to the shop many different times already and there is no issue that is showing. When I try to crank the car it acts like it wants to start but will not turn over.


    Dumb question here, have you tried replacing your fuel pump/fuel filter? Maybe check your sparkies/wires too, just to err on the side of caution?

    Also, when it cuts out, do you ever smell fuel?
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  12. #12 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    Hi you said you replaced the ignition module have you replaced the coil pack towers there should be six of them one for each cylinder you might want to replace your coil pack towers that might be the issue? I would also do research on intermittent coil pack power related issues but you might want to try that that's off the top of my head I don't know your situation but I thought I'd offer that good luck!
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  13. #13 Re: 2002 Pontiac grand prix 3.8 supercharged stalls and wont start 
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    No, there are 3 coil packs, which fire 2 cylinders each. These cars don't have COP from the factory.
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