22nd Jul 2007, 22:23

I'm looking for some opinions and advice from some one who is familiar with SLP's GTX Grand Prix. We are the 2nd owners of this narley machine. We know the 1st owner was all into it, adding aftermarket parts, running it at the track, ect. Part of the problem is that I don't know where SLP left off, and this guy took over. I know that it has an SLP modded MPU chip. But to what extent (or stage) I'm not sure. The problem is that above around 2500-3000 RPMs it begins a nasty miss. Almost as if the rev limiter comes on way too early. I wonder if the chip is some how freaking out the rev limiter. It had some fat red Taylor high performance wires on it when we got it, that looked new. When the problem developed, everyone said wires, wires, wires. I thought it was some thing else. But I put some new wires on it (the same Taylor wires as before). It seemed to fix it, made a fool of me. 4 months later, its back. These wires, I routed very nice. And there are ceramic boot sleeves on the boots. As before, I do not believe its the wires. Also the nose bearing in the blower is sounding real bad. Any advice on that? We can't afford to just go buy a new blower. Also could these be related. Thank every one who reads this in advance.

Vochris74@yahoo.com.

23rd Jul 2007, 11:38

To commenter 22:23:

Your electrical problems could be a coil pack or possibly a spark plug. As for the noise coming from the blower it could be the coupler bearing. Take a look on eBay and you can find rebuild kits for the supercharger that are surprisingly cheap.

16th Nov 2008, 10:00

We just purchased a 2004 grand prix gt and noticed water on the floor on the passenger side. We cannot find where it is coming in from. There is a lot of water and the carpet is soaked. Help!!!

9th Feb 2009, 11:43

I have a 1998 Grand Prix GT, and after a heavy rain I have to get up and vacuum the passenger side floorboard. I went to the car wash and the same thing happened. I was watching it come in and it doesn't even touch high on the back of the floor board, just hits in the bend.

I heard that Pontiac will pay you to have it fixed. Can anyone let me know who or where I can go to find out how to resolve this issue? And also since I bought it used, is there anyway to find out if there is any recalls on the car, and how to go about getting the recalls taking care of?

You can email me at smiley_72476@hotmail.com Thank you very much Mrs. Wetfeet.

10th May 2009, 19:56

98 Grand Prix passenger side carpet soaked, replaced rubber gasket under cowling and checked seals in floor board, still having problem... seems like water is coming from underneath. Please help... jynglehymer@aol.com

30th Jun 2009, 17:32

1998 Grand Prix replaced blower motor, the passanger floor board is still soaked with water after a heavy rain. No holes under car. Please Help!!! jageebusha@yahoo.com.

3rd Aug 2009, 00:55

I appreciate all of your help I've been beating my self up since last week. I got in my 2004 Pontiac Grand Prix last week and rolled my windows down without paying attention. Afterwards realized I had at least 3-4 inches of water in my passenger floor board. I really thought I left the window down. I have continued to sweep my car out. My husband and I just realized that was not the case at all. Now comes the fun part of finding which problem this is from all your guys help. Thank You wish us luck sounds like we will need it!

31st Aug 2009, 20:30

I have a 99 Pontiac Grand Prix GTP, and I keep getting water on the passenger floor board after a hard rain, and would like to know what all you have done to fix the problem, and which one actually fixed the problem? I've had to replace the blower once, but it was a long time ago and I'm constantly vacuuming out the water. Please, if there is any help out there for me, it would be greatly appreciated and checked into. Please help me.

Thanks,

GTP Lover.

3rd Feb 2010, 07:52

If you have ever had to replace a blower motor or resistor pack, which is behind the motor, you would soon find out what your problem is.

My wife's 98 Grand Prix had ice inside the blower motor, which caused it to not work.

Upon removing the blower motor, I saw the ice inside.

Upon inspection, I found the rubber gasket seal under the windshield cowl to be lying in the channel.

Some black rubber piece about 20 inches long, it was just lying there.

I took some adhesive sealant and glued it back in place.

No more leak and no more water in floorboard.

EASY fix.

Finding the leak was not so easy LOL.

11th May 2011, 19:10

I just bought a 2002 Pontiac Grand Prix GT and love the car.

I have not had any problems with the windshield leaking anytime it rains. And we have had some heavy rains. It's always dry inside the car after the rain. But I took it through the carwash the other day and it poured in through the top of the windshield onto the front passenger seat. Is there a sealant I can use or should I take it to a professional?