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Sedans Pontiac Grand Prix Pontiac Grand Prix - 2005 and earlier
4431 messages, Last post on Nov 30, 2009 at 7:07 AM
You are in the Pontiac Grand Prix Forum. Your Hosts are pat & karens
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alrighty, I've had the '99 for about 6 months now with 95,000 miles on it (154,000KM) and its giving me all sorts of headaches...im hoping someone has encountered similar problems so i can learn from them... 1a - boost gauge is ALWAYS showing a reading after slowing down on highways and speeding back up multiple times. if the road is empty, no issues whatsoever -- had it up to 106 mp/h a couple days ago on a long stretch of open highway and no issues. ( sidenote - certainly didnt take long to hit 100 mph, whee!  ) 1b - related to the boost gauge showing a constant reading, it seems to slowly increase every time i take my foot off the pedal (yes, its showing a reading when i am NOT using the accelerator) and seems to increase when i am off the pedal. its the strangest thing, usually starts with a reading at 2 'blocks' and has increased as far as 6, very odd considering im not accelerating. 1c - whenever im having the issue with the boost gague; i feel like im losing MAJOR power; i have had the throttle gauge sensor replaced about 5 weeks ago, didnt do a damn thing. a couple days ago when it was happening my rpms nearly hit 0. i swear i feel like the engine is just gonna seize and die, the dealership i bought it from couldnt find anything other than that sensor issue...but i think they are wrong. on occasion, when the rpms dropped like i mentioned, the car has outright stalled. once while coming down a mountain, that was fun its strange because driving in the city the car usually runs without a hitch, as soon as i hit the highway its a crapshoot (and a little frustrating because my girlfriend lives far away enough that i have to take the highway to see her) so this is driving me nuts, i like the car way too much to trade it in for some beater, but im frustrated when i see the rust buckets bombing around without an issue. has anyone had anything similar happen? any ideas what it could be? im so lost...im embarrased to drive my car for any long hauls! im supposed to have the road trip mobile...not my friend's lame acura integra...boo |
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Replying to: bxd (Jul 13, 2006 10:49 am)
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Replying to: gdtaylor (Nov 03, 2005 4:34 am) 
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I just bought a Black 2005 Grand Prix. I got it reasonable and I'm wanting to make it look and possibly perform better. It has the 3.8L. I will be putting 17 inch American Racing Sniper wheels next week after I paint the disc brake calipers red. I think the chrome wheels with the red calipers and black car should look good. I'm also having Auto One put a powered moon roof in. I want to make it look like a GTP I saw a few weeks ago. It was an 04 I believe and seven grand more. I figure I can get the same look for less if I shop. I would like to change the rear lower bumper valance to the dual exhaust and install the stainless tips from GM. Any thought or suggestions would be appreciated. I would like to do this on a budget as I have three sons, 20,17,and 10,(money pits), living at home. Thanks. Eric
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| So this may just be an outright stupid question, but how many parts would be interchangeable from a 99 GT going into a 97 GT? Would the engine and tranny fit into the 97? At all, modifications or not? What about any other parts. Yeah i'm sure y'all would say drive the 99, but can't. Everything works, but the 99 has been passed through too many hands, and anyone that'd know anything about the car is long gone, so I can't obtain a title, so it's just sitting around collecting dust. And I don't want that if I can help it. I've got a 150000 on my 97 and it'd be really sweet to swap out some major parts if possible, and nothing beats free. | |
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Replying to: chambo1 (Jul 15, 2006 8:24 pm) I have had a similar problem with my 2004 Grand Prix not starting. The engine turns over but won't start. Were you able to identify the cause of the problem and any solutions? I fear it may have something to do with the fuel system. Tim
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| I have an 2003 Grand Prix GT ( if it makes a diff) and i also own a bell rx 65 radar detector...i recently bought a hardwire kit ( beltronics brand) and hardwired it to my car...works perfectly minus one detail...my radio time display took a crap...i am wondering if anyone would know a possible reason why this would happen...radio still works..it lights up just LCD screen is out cold...any advice?? | |
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Replying to: tpmunyon (Oct 01, 2006 4:36 pm) |
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Hello, I purchased a 1999 Grandprix Coupe GT w/70k Automatic. The car runs great, except for starting. If its in the morning (first start, may be tempature related) the car starts up fine no problem. Its when I start the car warm, it turns over idles up and dies. It will do this a second time. Third time is a charm, it starts perfect. I know its bad, but if I give it gas I can save it from stalling out. Im lost, my mechanic is lost and the computer says everything is runnning A-Okay. Hope you guys can help. Jeff Read read  mysite.com
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Replying to: hammen2 (Dec 01, 2005 12:03 pm) |
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