Question about 1998 Pontiac Grand Prix

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1998 Pontiac Grand Prix GTP Supercharger coupler

I ws told the coupler(s) in my supercharger is going bad. It sounds like like something is grinding when I turn the engine off and also sound like a bunch of marbles banging around in it. they are inexpensive, but how difficult to fix?

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  • TJ Johnson May 15, 2009

    If i were to have the bearings replaced could i remove the supercharger and have it done, but is there a cover plate that could cover it until they got fixed?? would it work??


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The rattle you are/were hearing is typical on the Eaton blowers. After they get some miles on them, the coupler wears out and the holes become ob-longed or out of round which causes the rattle you are hearing.
Usually at idle you can hear it very clearly.
I have changed a few, and they are pretty simple to change. Just take off the supercharger belt, then you may have to remove your alternator bracket, depends on which years, drain the supercharger oil with a spray bottle sprayer (it does stink badly) then just remove the 10 or so bolts that hold the snout to the housing. Remember to keep track of where they go, some are different lengths.
You may have to use a rubber mallet, or your hand to hit the snout around to break the gaskets loose. Pull off the old black hockey puck looking thing (coupler) clean out the snout, attach new coupler, then reassemble and put new supercharger oil back in, and your rattle will be gone, at least for another 100k miles.
Best place to get a coupler is at,
Costs about 30, plus the few bottles of oil for the supercharger.

Posted on Jan 04, 2010

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My gtp starts then die in 2 seconds and put a in grank senor on it and same thing

Posted on Oct 11, 2010

  • minebroke2 Jan 04, 2011

    resistor is bad recall years ago


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Most likely cause of the noises you discribe are the bearings in the supercharger. You would be better off buying a remanufactured supercharger rather than attempting to replace the bearings yourself. Good luck.

Posted on May 15, 2009

  • jg1523 May 15, 2009

    I haven't heard of a cover plate being available.

    I think in order to get the right bearings, you would have to take it apart and get the numbers off of them. Unless you can find someone that has a listing for the bearings. Good luck. Hope this helps out.


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