Supercharger rattle in front
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Cadillac STS-V Series Forum Discussion, Supercharger rattle in front in Cadillac V-Series Forums; I seemed to have picked up an occasional rattle. I am trying to pinpoint it, but I'm thinking it's coming ...
  1. #1
    todrules is offline Cadillac Owners Fanatic
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    Supercharger rattle in front

    I seemed to have picked up an occasional rattle. I am trying to pinpoint it, but I'm thinking it's coming from the front of the unit near the snout. Is it possible that it's the coupler or isolator? I did recently upgrade the pulley so the snout was off and machined, it's not sounding like a dry bearing, definitely more of a rattle. It seems to come and go and obviously observed during idle. I'm aware this things do make some noise which is normal, but this doesn't seem very normal to me. Any help would be greatly appreciated.

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  3. #2
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: Supercharger rattle in front

    My vote is coupler. Did you replace it when you did the pulley? If not you may need to get one from Tim. Try to isolate the noise with a stethoscope tool. If you don't have one, you can get them cheap!


  4. #3
    todrules is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    No I didn't replace the coupler. I guess I might as well pull the snout again. Yay stinky oil again. No I didn't use a stethoscope I just used a screwdriver on my ear. I can always pick one up. I'm almost thinking of replacing the bearing in the snout as well if I pull it again.

  5. #4
    PGA2B's Avatar
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    Re: Supercharger rattle in front

    I think Tim can get you an entire rebuild kit.

  6. #5
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Supercharger rattle in front

    Quote Originally Posted by PGA2B View Post
    I think Tim can get you an entire rebuild kit.
    It is probably the coupler. I can get you a solid one for $15 plus shipping. Sometimes backlash in the rotor gears can make noise too.

  7. #6
    todrules is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    I guess I'll start with the solid coupler. I'll email you for the total. Thanks as always!

  8. #7
    youknooow is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    I believe I have the same noise, I thought it was the exhaust... It was more frequent than it is now... Will this harm the vehicle if this is the coupler?

  9. #8
    todrules is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    Ok, I don't think it's the coupler. The pulley clearance with the snout was obviously too tight. The pulley is obviously the culprit. Pretty easy fix.002.JPG

  10. #9
    Fierofiend is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    How did that happen? User error during install?

  11. #10
    todrules is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    No idea how it happened. The snout was machined to accept the pulley, I guess clearance was a bit tight. There is definitely clearance now, seeing as how the pulley machined it's own.

  12. #11
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    parkeraire is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    Time to give TimmyC a call.

  13. #12
    todrules is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    Ok an update. I pulled the snout to clean up where the previous pulley made contact. I checked the coupler, there is very little to no play. Fit new pulley, there is plenty of clearance. I put everything back together and the car is missing like crazy. Barely started. I'm thinking possible manifold gasket. I double checked everything is tight, nothing unplugged, no obvious vacuum leaks. Could I have damaged the bypass acuator? I'm just trying to brainstorm here. I guess I will start taking it apart again. I'm seriously convinced trying to mod this car was the worst mistake I've ever made. I'm almost ready to just buy a stock supercharger on ebay and throw it on and just leave it stock. I've had mulitple issues with pulleys now, never had any issues with the car until I started trying to increase the boost. Any thoughts. The only code I had was just a P0300, a mulitple misfire, so there must be spark or vacuum leak. I would guess vacuum or manifold gasket.

  14. #13
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Supercharger rattle in front

    What did you remove? Did the brake booster vacuum line come off somehow? Is the MAF unplugged?

    These cars are not generally problematic when modded.

  15. #14
    todrules is offline Cadillac Owners Fanatic
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    Re: Supercharger rattle in front

    I didn't touch the MAF, it's plugged in. The brake booster vacuum line is connected. I loosed the supercharger bolts to tilt up the supercharger to access the snout bolts, and I did figgle with bypass actuator to remove snout other than that. I'm lost. I may have something pinched is my only thought. I'll play around tomorrow morning and see if anything is obvious.

  16. #15
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: Supercharger rattle in front

    Check you vac lines around the Supercharger esp on the driver side.

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