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2006 Grand Prix GXP issues (LS4)

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  • 2006 Grand Prix GXP issues (LS4)

    Took the car in today after dealing with an annoying problem for quite some time. I searched around online like crazy to see what the widest tire was that I could fit on a stock 18" gxp front wheel and ended up going with a set of 275/35/18 's. Almost as soon as I left the parking lot after having the new tires put on, i was having problems with my brakes.. Every time I would tap my breaks or go to stop, my anti lock brake system would kick in and almost nearly keeping from stopping completely. it scared the sh$# out of me! Once I would hit around 55-60 mph my abs, service brake soon, and traction control lights would all come on and the problem was solved. But ONLY if i get up to this speed will it fix my problem. So i took the car in today and found out that it is most likely the way the pc is tuned because when they took it for a drive, they said that my rear tires were showing about 4 mph faster than the front tires... He also said that my rear tires (nearly brand new) were wearing unevenly and that the insides of the were worn down to almost nothing! most likely an alignment issue which i can handle. But i have no idea how to tackle this issue with the wider front tires keeping me from being able to use my brakes the way their meant to used.
    It is not the bearing or the sensors btw, had them all checked out and they are nice and tight.

    Problem number 2
    The car started over heating, long story short I need a new water pump. I wasn't seeing anything leaking and finally found that it was dripping a bit from the seal and that's why i never had a trace of it leaving the car. Filled up my reservoir and it fixed the problem (for now) but i was told that the pump required a manifold as well to replace and that it would be $800!! No way in hell am i paying that for something this simple. Anyone had any experience with this issue? Also when i brought my car in the shop told me that my throttle positioning sensor was going bad or was off or something and he said he cleaned it up.. that being said, my car now idles at 1100 rpms and is stupid annoying to sit in when its running. its been 6 hours and i already want to go back and wring this guy's neck because it now has an idle speed of about 17 mph!! I cannot stop very well any more at all, between the mix of the anti lock brakes kicking in when they arent supposed to and the car not wanting to stop because the motor is idling so high, i may run into a ton of problems in the future. its scary driving this thing now especially because of the high idle. Could he have messed with the position or something?
    Any help would be much appreciated
    1994 Z28 A4 Leather, Ttops, Angel Eyes, Flowmaster 40 series *Sold*
    1994 Z28 M6 Leather, TTops, Dynomax, 9C1 LT1, CAI

  • #2
    I'm trying to remember what stock was on our GXP, I think 255/45/18.

    If I'm right, your new tires are almost and inch and a half SHORTER than original...of course it's going to screw up the computer!

    I'll look of the other issues.

    1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
    1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
    1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

    2006 Saab 9-7x 5.3i Daily Driver

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    • #3
      Is there an easy way to tune this out or change this tire size without having to pay for a $200 tune from someone? Can tire shops do this? ie Belle Tire
      1994 Z28 A4 Leather, Ttops, Angel Eyes, Flowmaster 40 series *Sold*
      1994 Z28 M6 Leather, TTops, Dynomax, 9C1 LT1, CAI

      Comment


      • #4
        So , the front and rear tires are not the same size?
        The tps may be somewhat adjustable. Usually the issue he removed it for though is caused by the throttle body.

        Comment


        • #5
          You should have gotten 275/40/18's. You can drop the profile on the rear to match, you're speedo is going to read 5-6% fast with the new front tires you have now.

          Unplug your ABS fuse for now, I don't think you'll be able to tune that one out.

          1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
          1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
          1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

          2006 Saab 9-7x 5.3i Daily Driver

          Comment


          • #6
            Originally posted by 1BADAIR View Post
            So , the front and rear tires are not the same size?
            The tps may be somewhat adjustable. Usually the issue he removed it for though is caused by the throttle body.
            Very possible. i may want to call and ask what it is that they did. But yea the front wheels are 8.5" wide and the rear are 8" wide. They put wider tires on the front from the factory on the gxp grand prix because of the extra grip it provides i guess.
            1994 Z28 A4 Leather, Ttops, Angel Eyes, Flowmaster 40 series *Sold*
            1994 Z28 M6 Leather, TTops, Dynomax, 9C1 LT1, CAI

            Comment


            • #7
              Originally posted by hoogiesngrinderz View Post
              You should have gotten 275/40/18's. You can drop the profile on the rear to match, you're speedo is going to read 5-6% fast with the new front tires you have now.

              Unplug your ABS fuse for now, I don't think you'll be able to tune that one out.
              that sucks!! i read so many posts on people having great luck with this size and ive already put 1000 miles on these tires. Lets just hope that it can be tuned out. Wont my lights all be on though if I unplug my abs fuse? I hate having my dash lit up like a christmas tree lol.
              1994 Z28 A4 Leather, Ttops, Angel Eyes, Flowmaster 40 series *Sold*
              1994 Z28 M6 Leather, TTops, Dynomax, 9C1 LT1, CAI

              Comment


              • #8
                That's quite a bit of difference. What size is on the rear, 225/50/18?

                Water pump shouldn't be a big deal, they aren't cheap though. Held in by 5 bolts that are accessed through the pulley.

                1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
                1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
                1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

                2006 Saab 9-7x 5.3i Daily Driver

                Comment


                • #9
                  255/45/18
                  225/50/18

                  its like 770 rpm vs 815 for the new
                  Last edited by 1BADAIR; January 10th, 2013, 09:49 PM.

                  Comment


                  • #10
                    I wouldn't have run a 275 low profile tire on the stock GXP rim either, but that's me. Those stock Alcoa's are actually 18x8 front and 18x7 rear. Check to see if the tires are rubbing on the cradle at full lock.

                    1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
                    1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
                    1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

                    2006 Saab 9-7x 5.3i Daily Driver

                    Comment


                    • #11
                      Originally posted by hoogiesngrinderz View Post
                      I wouldn't have run a 275 low profile tire on the stock GXP rim either, but that's me. Those stock Alcoa's are actually 18x8 front and 18x7 rear. Check to see if the tires are rubbing on the cradle at full lock.
                      They don't rub one bit surprisingly. The only reason why I went with this size is because of the feedback on a grandprixforums site where quite a few people had awesome luck with this size and never seemed to run into any problems like this.
                      1994 Z28 A4 Leather, Ttops, Angel Eyes, Flowmaster 40 series *Sold*
                      1994 Z28 M6 Leather, TTops, Dynomax, 9C1 LT1, CAI

                      Comment


                      • #12
                        So basically the easiest way to fix this problem would be to either find a set of matching Alcoa factory wheels for the back that are the same size as the front, or get a lower profile tire for the back? would a 45 height work instead of a matching 35.. ? I don't want to go too low pro on the back because it would sacrifice my ride comfort too much. I guess I only have these two options if it can't be tuned out

                        I was actually able to do this with my 94 Z28 without a problem and it fixed my abs issue. I had 285's in the back and stock size on the front and it was doing a very similar thing. As soon as I had a guy from LT1tuning.com tune my pcm he asked what tires i was running and once i told him he asked if i was having issues with my abs or traction control before i even said anything lol. After he was done tuning for the new size and the exhaust work that i had done to it, I never had that problem again.
                        1994 Z28 A4 Leather, Ttops, Angel Eyes, Flowmaster 40 series *Sold*
                        1994 Z28 M6 Leather, TTops, Dynomax, 9C1 LT1, CAI

                        Comment


                        • #13
                          tires are too short in front, waterpump is $400 tops at the dealer, uneven tire wear is normal on these cars, not sure on the idle issue, is everything plugged in around the TB?
                          - 2012 Mustang GT 5.0 - M6 / Brembo Package / 3.73 / Bama Tune / Catless X / Corsa Xtreme /
                          - 2006 TBSS 2wd - Nitrous Grind Cam / Stainless Works LT's / Nitrous Works / FMStune / IeatSRT CAI / Stg 6 Trans / Kbee Coilovers / SOLD
                          - 1997 Camaro - Crane 234 242 / PortedPolishedMilled / Kooks / Borla / CompClutch / pro5.0 / 4.10's / SLP / SOLD
                          - 2008 G8 GT - Kooks / Vararam / HSRK / FMStune / SOLD
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                          • #14
                            tire heights need to be the same or you will trigger the lights. Check the front control arm bushings, I am on my third set in my 2004 GTP.
                            When in doubt, Whip it out !

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                            • #15
                              Autozone has a pump for $132. If yours is just leaking, just put on a new o-ring and gaskets.

                              What kind/brand of tires do you have up front? I was looking for 275/35/18's for my Camaro

                              1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
                              1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
                              1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

                              2006 Saab 9-7x 5.3i Daily Driver

                              Comment

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