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  1. #1
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    Default 2006 grand prix loss of power at 40 miles an hr

    Grand prix stumbles at 40 miles an hr. when car is cold it runs fine when car heats up problem starts. New plugs wires coils and new cat thanks for any help

  2. #2
    GrandPrix Junkie
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Bad O2 sensor, bad TPS, clean the MAF with approved MAF cleaner. Maybe even remove and clean it up. Any codes showing? Also, what type/brand plugs did you install?

  3. #3
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    ac delco wires and plugs same brand that were in the car cleaned the Maf .Do you think may be bad 02 sensor have never changed them 120000 miles on car

  4. #4
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    the check engine light on?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  5. #5
    GTX Level Member QUICKSILVER462's Avatar
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Get a code reader so you can pull any stored codes and watch live data from the sensors while it is running.

  6. #6
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Gets a flashing code p0300 until you get past the 40 mile an hr or let off gas then flashing stops.Only code stored p0300 and some times light only comes on for a second and stores no codes and sometimes car will throw no codes at all when it stumbles at 40.

  7. #7
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Trying to find a scanner that reads live data mine don't advance had one but some one stole it auto zone has the same scanner as mine.

  8. #8
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    If it's only when warm my one guess is that the ignition control module starts to act up once some heat gets into it.

    Because you've already replace plugs, wires and coils.

    SMGPFC Member #1

  9. #9
    Killa Bee Scottydoggs's Avatar
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    the car feel weak and gut less? if so you got a clogged cat.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  10. #10
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    First post says he replaced it.

    SMGPFC Member #1

  11. #11
    Killa Bee Scottydoggs's Avatar
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    well crap

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  12. #12
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Forgot to mention that's new also. I do most of my own work I was stumped on this one went to garage he changed the coils and ignition control module no help he always did good by me but left me hanging on this one said it might be a bad injector or something else cant afford for him to keep trying this or that

  13. #13
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Actron CP9575, is the one I have, I actually keep it in the glove box for once in a while I get the po4020 code.

  14. #14
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Update this problem first thanks for all the input. Changed down stream 02 sensor and car has been running great for about a week now also changed upstream sensor a couple days later.Got a new problem now getting a p0054 code after about driving 60 miles at start up cleared code and code came back after 60 miles at a cold start up using remote starter car still running good thanks for any help

  15. #15
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    There is either the open/short in the harness to the sensor or the sensor to the harness.

    Or the bank 2 sensor is faulty. Those are the most likely causes.

    SMGPFC Member #1

  16. #16
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    Default Re: 2006 grand prix loss of power at 40 miles an hr

    Thanks sensor is new any way to tell if its a bad one

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