What is wrong with my supercharger?

**maxster** · 10-03-2008

My 98 GTP supercharger is rattling at stop lights and searching indicates bad coupler.

However the supercharger is also causing my engine to loose power - where sometimes I can barely make it up a hill. I thought it was my transmission not downshifting and was planning for a rebuild but the previous couple of days I took the SC belt off and it drives perfect only lacking a little bit of power due to no SC.

The SC pulley seem to spin nicely - are my SC rotors bad? The SC makes a loud rattling unnatural sound every time I turn the engine off as if things are clunking into each other. Are there other SC parts that can cause power loss? I am not sure why the engine RPM stays under 2000 sometimes when I hit the gas even if I floor it and the boost indicator is coming on.

Am I ok to drive with the belt off for a long while?

Thanks.

**kyle99gtp** · 10-03-2008

yes, you can drive with the belt off.

that definately sounds like a bad coupler. id just rebuild the whole thing though personally.

**SLO-6** · 10-04-2008

Yea deffinatley look in too rebuilding it. One of my pullies just started acting up havent looked into which one been a little preoccupied...

**Blown97** · 10-05-2008

Well, it sounds to me like you might have a couple problems. The rattling both when the engine is running and after it shuts off sounds like a coupler or bearings that need to be changed. Like previously suggested it might be worth either rebuilding or getting a rebuilt S/C.

On the second thing where you say you can't go up past 2000 rpm, if fixing the S/C doesn't fix that problem, I would suggest that you might be having a fuel problem (weak fuel pump). I had the same problem as you did (turned out to be a FP for me). You can check this out by getting a fuel pressure tester. Fuel system pressure should be between 48-55 PSI. Good luck and let us know how it goes

**LaCabra** · 03-28-2009

Where is a good place to get my S/C rebuilt... or can i do it myself

**Sabrewings** · 03-28-2009

The blower isn't hard to take apart or put together. Taking it apart will tell you what components need to be replaced, which will determine how expensive it is.

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