94 Grand Prix Won't Run After Normal Operating Temp

Tiny
BPIPPIN
  • MEMBER
  • 1994 PONTIAC GRAND PRIX
This is a 1994 Pontiac Grand Prix 3.1 SFI 136,000 miles. Here is a little history. I have had the car for almost 2 years. I bought it used from a car dealer cash. The car ran great. Once it was at a steady rpm's for more than five minutes the Check Engine light came on. Obviously it was the EGR valve. It cost 199.99 from autozone or O'rieleys. Since all this sensor mainly did was re burn exhast to save some fuel milage. I decided to just cap off the EGR valve. So it still sets off the engine light when on the highway. This is harmless too me. I have been driving the car under this condition for approx the full time I have had the car. I had to get the car inspected when I got it and it failed emission test. (It needed a new cadilic converter) It passed with flying colors and pass just as good this past march. Since the first part of 2007 over a few days time the battery would slowly run down. I put 2 new batteries and now 5 alternators. I did the test light thing on the battery pulled fuses, new battery cables, checked all lights including hood, interior, glove box, trunk, etc. I have been fighting this for 7 months. Now I just hook the charger to the car every few days and live with it. *****Now here is the history of the problem that has lead to the car un drivable at normal temps. It started having trouble when it rained and hot large puddles of water. It would die and have to dry out to run again. I avoided those puddles :). Then it progressed to just being hard to start it and keep it running. Just last week I was driving for about 20 minutes the car died in the highway. It started right back up and continued on for about 5 more miles. Then it died again and wouldn't start. I was able to let it sit for about 10 minutes then it started long enough to get it off the highway. It acted to me it was starving for fuel. I had it towed back home since I have always done my own work. That after noon changed the fuel filter. It fuel in the old filter I drained in a clear glass and suprising it was very clean. Of course the car was cool since it had been sitting all night. It started right back up. I Cranked the car to let it charge the battery up since it had been started on alot when I was on the road broke down. You can start the car in the morning and it will run for 20 minutes or so. You can even drive it to the gas station and back thats close flawless. Once the engine gets hot (normal operating temp) it dies and will not start. It turns over and if you pump the accelerator it will barely stay running. Again sounds like a fuel problem. (Why would it only do it when it was hot) I changed the Ignition Control module that test bad. Same problem. Coil packs test good as well. I'm beting some sort of sensor fails when it gets hot and this sensor may also be the one draining the battery /shrug. So the problem remains. Oh btw I fixed the problem with the water splashing up on the engine when I squited water on the plug wires it wouldnt run. Changed the wires and that problem was solved. Main question is now what else could be causing the engine not to run when its hot? You have to let the car sit for hours before it will give me another 20 minute great running time. If taking it to the dealer is my only option then I will do so. Everyone around here wants 100 bucks just to plug it in.
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Thursday, July 26th, 2007 AT 1:43 PM

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Tiny
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Tuesday, September 11th, 2007 AT 2:14 AM

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