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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...
Ok, let me give you the back story...
-Bout 8 months ago i gave my buddy my park avenue to swap motors into a Grand Prix GT i picked up with a blown motor. L67, Gen V, 1.85YT, SD Headers, 75 shot N2O, etc, etc
-I believe that he took my motor and put it in his Impala, which is a story i'll save for later. Which i believe he top swapped his motor and put it in my car and dropped the complete L67 block in his. Makes it worse because i helped him find the parts to do it.
-Guy on the forum tuned my PCM for these particular parts, which apparently i no longer have. Now since i started driving the car i put it on the highway like on my way to work and it randomly stalls out. No matter the time of day and no warning signs. RPM's dont drop fast but gradually fall back to zero.
-I have replaced MAF, plugs, IAC, ICM, Coil packs, BBV, vac lines.
-He did put on my SSIC, but knows if he did it right and swapped my pulley down to a 3.25. I did not buy the swap kit from zzp, so he spliced the wires for the map sensor, could they be wired up wrong?
On the streets the it runs ok, it doesnt stall out at all. On the highway which is how i get to work is my issue. Out of nowhere and boom dead. It does however start back up immediately.
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