Question about 2001 Pontiac Grand Prix
Here is the info I have. Sorry it is a 2000 Grand Prix GTP. Fuel Pump that was installed is not an upgrade, got it from auto zone. I use 89 octane fuel and have used it for years with no probems. I know you are suppose to use premium. It always starts and it gets hot even if you let it idol. It will bog down if you try and press the gas pedal but it will stay running. Please help!! I appreciate your responses and hope to fix this.Problem started when I took car on a long road trip. Car sat after I got up there and I drove it a couple days later and it wasn't running right but after driving it a little bit it went away. Then was driving home and hit stopngo traffic and car was sputtering and wouldn't accel. Had to have it towed. Thanks for your help and hope you can help. Robert
Sounds a lot like a fuel rail pressure issue. Re-check your work. Make sure your supply AND return fuel lines are not pinched or kinked.(that won't cost anything) Put a $15 NAPA Gold fuel filter on. At eight years you can't go wrong-it should need it anyway. Next step up in price is to have a mechanic attach a pressure gauge to the Schrader valve and monitor rail pressure as you drive and reproduce the stumbling. I'm betting your mixture is getting FUBARed causing your PCM (computer) to pull timing, that in combination with the low octane gas is causing your mixture to ignite so late it's still burning in your exhaust system. Retarded ignition timing will cause MASSIVE losses in power and dangerous under-hood temperatures. The reason I say dangerous is the GTP engine fire recall situation. http://www.gminsidenews.com/forums/f33/upcoming-recall-07035-97-03-gp-regal-3800-s-c-vin-1-a-61961/
If you’re throwing half burned gas down the manifolds and into the catalytic converter, it will overheat (and glow red or orange) and the internal lattice will melt and collapse (may have already happened) this will restrict the exhaust badly and cause a further reduction in power and more knock timing ******.
LMK what you find after the filter or fuel pressure test. That will tell you where to go from there.
Posted on Aug 06, 2008
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