Thread: 2002 Grand Prix GT

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  1. #1 2002 Grand Prix GT 
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    I am in need of someone's opinion here.
    Recently my engine started making some serious noise and I took it to the shop. They said I had a bad rod bearing and that the motor was toast.

    I got a used motor installed and everything about the car is wrong now.

    They took out my motor and put in another 3800 from a 2005 Monte Carlo SS - EDIT - Not supercharged.

    Mechanic said that it was normal as it is the same motor.

    Well, the car does not shift properly now and feels like it has 1/2 the power it had.

    He claims my transmission is going out -but it was fine when I brought it in.

    I am wondering, if they just switched motors, is there any possibility that the motor and trans are not compatible? Different gearing?

    I am at a loss and ready to get a lawyer....ARGH!

    Any info at all would be much appreciated.

    -Mike
    Last edited by mmullings; 02-17-2011 at 04:43 PM.
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  2. #2 Re: 2002 Grand Prix GT 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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  3. #3 Re: 2002 Grand Prix GT 
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    There's no supercharger on it.
    The motors 'look' the same, he said the only difference was there was no oil cooling line on mine.

    -Mike
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  4. #4 Re: 2002 Grand Prix GT 
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    From what I read there is an L26 and an L36 motor (depending on year)
    And my L36 would have been replaced by the 2005 L26.

    Forgive me if I am WAY off course...I'm not a car guy - I'm in IT.

    -Mike
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  5. #5 Re: 2002 Grand Prix GT 
    Resident HOMOsapien ZR1Vette09's Avatar
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    Somewhere your information has gotten mixed up. The 2005 Monte Carlo SS had the L32 (supercharged) which FFDP showed you up there.
    '00 Blazer- Good riddance '06 Grand Prix GT- Dead and Cool '05 Silverado- Sold '96 Jeep Cherokee-DD '97 BMW 328i-Project
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  6. #6 Re: 2002 Grand Prix GT 
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    Very interesting - just repeating 'what I heard from the mechanic'.
    It looks like it could be from the LT not the SS.
    Good catch - thanks....the more I learn the better I can chat with these cats.

    -Mike
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  7. #7 Re: 2002 Grand Prix GT 
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    Update:

    The used motor was from a 2005 Impala - not a Monte like I thought.

    So I took it back to the shop.
    They finally see what I mean when I say it has no power.

    They kept it for a day and a half and said come get it - we have no idea why it is like this.

    Then they said to take it to a GM dealer - on their dime.
    So - tomorrow it's off to the dealer for a diagnosis.

    -Mike
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  8. #8 Re: 2002 Grand Prix GT 
    GT Level Member zipper's Avatar
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    Quote Originally Posted by ZR1Vette09 View Post
    Somewhere your information has gotten mixed up. The 2005 Monte Carlo SS had the L32 (supercharged) which FFDP showed you up there.
    This is incorrect. The 2005 Monte Carlo SS came with the L67 (Gen 3 M90). However, you are correct that mmullings is has his information mixed up though because the only engine offered in the 2005 Monte Carlo SS was the L67. If the 3800 came from a 2005 Impala (or 2005 Monte Carlo LT for that matter), it would be an L36, not an L26. You can tell the difference between the two due to the UIM manifolds (L36 is plastic, L26 is aluminum) and the L26 has an electronic t/b.

    Good luck with the problems that you're having. At least the shop is covering the dealership costs.

    NA dyno: 222whp
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  9. #9 Re: 2002 Grand Prix GT 
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    Update:

    After GM dealer did some diags on the car:

    A leaking o-ring on a PCV and a completely clogged catalytic converter.

    Car runs like a champ - like it was de-neutered....



    Thanks all for help.

    -Mike
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