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I've also got a My 2001 Grand Prix GT has been "fixed" three times by a previous owners, and it stills stalls out on the hiway randomly. Now normally, I'd just assume the problem was unrelated to whatever the mechanics fixed (i.e. MAF, cam and crank position sensors, PVC valve, mapping sensor were replaced before I got this car). Also the security feature suggested if it's actually the security system that randomly engaging. The 1997-2003 Grand Prix with an alarm system ( there is a 3 on the Key to see this) have a Passkey III immobilizer-type setup that cuts power to the fuel pump and starter. To check for this when your car is stalled turn it to the accessory mode for 10min then to the off mode and it should start if it is the key..
This is EXACTLY what happens when it stalls out; the car will just suddenly die, with no warning at all except a shudder, and the "low oil pressure" and "low voltage" warning lights on the dash come on. When you try to restart, the fuel pump doesn't consistently engage, as if it's still trying to immobilize the car. I need to take the battery cable off wait and it seems to rest the computer...
Please Help me i found that many people have this problem and the scrap yard is full of these cars...
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