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Older Grand Prix Maintenance and Repair (1999 and earlier)



  • rach514rach514 Posts: 2
    I have a 98 grand prix gtp that sort of does the same thing. I mean I was told by my transmission guy that my 3rd gear was gone. I just took it to him yesterday. I just bought my car about 3 weeks ago. I didn't notice the problem until I had it a couple of days. It runs smooth but I when I get going about 35 to 50 mph my rpms are running between 2 1/2 and 3 grand then it shifts and everything is ok. But if I am going through town and only need to run between 35 and 45 mph it doesn't shift. I don't know what to do with mine. Maybe we could kinda help eachother out with any info we get. Thank You and I hope it will be a cheap fix.
  • rach514rach514 Posts: 2
    Hi I have a 98 grand prix gtp I just bought about 3 weeks ago. When I was driving home the other day I don't really know what happened but thats when my problem really started. My car if I am running between 35 to 50 mph my rpms run about 2 1/2 to 3 grand and then suddenly it shifts but if I have to only anywhere between 35 to 45 mph my poor cars rpms are running way to high. I was hoping maybe someone had some answers or suggestions for me. Any and all would be greatly appreciated. Thank you
  • 1stsgtrock1stsgtrock Posts: 2
    Okay, I know there are probably several discussions regarding starting issues here. But here is my situation. My 96 Grand Prix Coupe will turn over but does not start. My wife was the last one to attempt starting it. She said that the Battery light came on. So I charged the battery. Attempted another restart and still same situation. Now my Fuel gauge reads full yet I just added about 2.5 gallons of fuel to the car. Still will not start. Anyone have any suggestions as to the problem? Is it a fuse? Pump? Crank sensor? Would any of these things cause the fuel gauge to read full?
  • i have a 92 grand prix. i have replaced so many things over the last few years including: timing chain, the housing, the gears, spark plugs and wires, alternator, starter, a helio coil for the spark plug. but what i am trying to get at is this, after my timing chain broke and had it repaired, the car won't idle unless you have your foot on the gas pedal. it will start no prob but won't stay running. does anyone know why this is? is it something internally wrong with the motor? is it something i can fix easily?
  • bishop03bishop03 Posts: 1
    i have a starting issue as car ran rough for a while like a few days wouldnt stay running in idle. this morning i went out and it wont start at all...could be so many things wrong...where do i start?
  • thatazguythatazguy Posts: 9
    Get some dielectric gel, high heat if they make it, and do all the harness connections you can, starting at the firewall connection (in the cab) all the way to the computer. (TCM) Please let me know if this helps. The old mechanic that had me do this also was blasting the backs of the harness connections with PB Blaster to eat any other green (corrosion) that we couldn't see on the connections. Gel 1st though. Squirt a bunch on, then wipe excess. I tried to keep the tip of the gel square with the plugs to force the gel into the connections. My Dodge now shifts from 2nd to 3rd much better, until it gets hot. =)
  • tinag1tinag1 Posts: 1
    My car keeps over heating I have replace thethermostate and radiator the radiator cap water pump and I'm still overheating.when I pull over and unscrew my pressure values nothing but air comes out also my antifreeze. goes back into my overflow
  • crochunter06crochunter06 Posts: 2
    edited December 2011
    I'm looking into possibly buying a 1994 Pontiac Grand Prix SE Sedan and the seller listed that everything is in good working condition and everything runs good. The only fault I've seen (so far at least) is that they said the head gasket needs to be replaced.. Now my question is does anyone know around how much that repair would be? Or does anyone have a guestimate as to prices? Thanks!
  • jpfjpf Posts: 496
    Before you buy the car, you need to be sure that no anti-freeze leaked into the engine oil. If so, serious damage could be done to the engine. If the engine oil is a milky color, then the anti-freeze has leaked into the oil. Generally, with GM's gasket failures (V6 engines) the leak is external and there is no internal engine damage if repaired promptly after discovery.

    Also, note the 94 model year is pre-DexCool, which means it takes the old green colored antifreeze (not the pink stuff).

    As for price, my guess would be about $500 (parts and labor). You need to find a reputable repair shop and not just shop on price alone. For example, the engine surfaces must be cleaned properly otherwise the leak will develop again in a short time.

    I recently purchased a 1994 Grand Prix (August 2011) with 125k miles. Engine is peppy and gas mileage is quite good for this vintage of vehicle. With the exception of the gasket problems, GM's V6 OHV engines are quite reliable and can go for 200 to 300k miles with just regular maintenance. Good luck.
  • Im not sure bout a 94 but i just replaced the head gaskets on my 02'. If the 94 set up is anything like the 02' $500 might get u half way. I also had a leaking intake gasket so after i had gone down that far wasn't much to just take the head off and do that also. After i had it all back together head was still leaking. While i had the head off checked for warp and noticed a lil but thought it was within specs. Turns out it was not : ( So being very frustrated and not wanting to go through this process again I decided to do something that I would never otherwise attempted, especially for a warped head. I used an additive to seal the head. The 1 I chose was "Blue Devil" and I can honestly say that it is GREAT stuff. It cost $65 a quart but compared to repair costs its nothing besides you only need 1. Followed directions on bottle and within minutes my temp dropped and my heat came back. It is an all liquid additive so nothing to clog cooling system and will seal all cooling system leaks. although I can only attest to the head.

    As far as coolant getting in the oil goes. Yes it CAN cause serious damage but as long as the engine is not locked up chances are good it didn't hurt it to bad if it is present. Just make sure to change oil before start and again after about 1000 miles to flush all that coolant out.
  • i own a 1994 Pontiac Grand Prix and i have spent $40 dollars on my gasket. I am also looking to sell my car for $2500 it is in excellent condition.
  • autobody21autobody21 Posts: 1
    I have the same car in the same condition. I have asked several mechanics and every time I was given a price tag of $1,500 to $1,600 to repair. I was told to have both gaskets replaced while having the one replaced.
    I looked into just the parts only and I can do it myself for about $50 bucks. I can order an entire gasket kit for $161. So if you are knowledgeable or know someone who is and can help you with the repair, then that’s your better option! I plan on tackling it with a buddy who has some experience in the subject matter. In the end, if nothing else arises, I will end up putting no more than $300 in to the repair, plus my time. I say $300 because I need a new battery and want to do some cosmetic work. Compared to $1,600 I’d take my chances and learn something new in the process.
  • I have a 97 3800. it is doing the same thing. i talked to a guy seemed to know what he was talking about, the intake gasket needs to be replaced. he said you have a leak into the system creating a air pocket. i havent went into it yet to figure it out, if you have message me back please.
  • sweetascandysweetascandy Posts: 1
    edited July 2012
    i have a 1997 3800 it only over heats when you have to sit still, like at a red light,,i have had it in the shop twice, and no one seems to be able to tell me what is going on, and the hotter it gets outside the worse it gets, if anyone could help,,, the fans come on and seem to be working right.
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