2100-2350RPM Vibration fix is eluding me
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2004-2007 Cadillac CTS-V General Discussion Discussion, 2100-2350RPM Vibration fix is eluding me in Cadillac CTS-V Series Forum - 2004 - 2007; I have an '04 V with 71K on it. Since I bought it (65k) it has had a vibration at ...
  1. #1
    DougNuts is offline Cadillac Owners Fanatic
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    2100-2350RPM Vibration fix is eluding me

    I have an '04 V with 71K on it. Since I bought it (65k) it has had a vibration at 2100-2350RPM in any gear (accelerating and decelerating) and a shudder at shutdown.

    I have installed CS motor mounts, LS7 flywheel and an ATI damper and the issue still persists.

    Has anyone been successful in eliminating this vibration? It has to be the engine, so what is it?

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    Houdini's Avatar
    Houdini is offline Cadillac Owners Connoisseur
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    Re: 2100-2350RPM Vibration fix is eluding me

    What about out of gear and rev the engine to the same rpm... get vibration then?

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    DougNuts is offline Cadillac Owners Fanatic
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by Houdini View Post
    What about out of gear and rev the engine to the same rpm... get vibration then?
    I don't think so, but I've only tried it one or two times.

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    CadzillaTN's Avatar
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    Re: 2100-2350RPM Vibration fix is eluding me

    V is for Vibration

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    Houdini's Avatar
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    Re: 2100-2350RPM Vibration fix is eluding me

    ^hahahahah

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    DougNuts is offline Cadillac Owners Fanatic
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by Houdini View Post
    What about out of gear and rev the engine to the same rpm... get vibration then?
    When I rev it in neutral, it does a similar vibration at a all RPMs up to 3k (highest I took it), so I can't tell any difference at the RPM range that I've been talking about.

  8. #7
    lollygagger8's Avatar
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    Re: 2100-2350RPM Vibration fix is eluding me

    Try reindexing your driveshaft. You always want to mark where it sits before you remove it.

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    CadzillaTN's Avatar
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    The driveshaft doesn't spin if the car is stationary and in neutral, correct?

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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by CadzillaTN View Post
    The driveshaft doesn't spin if the car is stationary and in neutral, correct?
    Correct.



    My guess is it is the LS7 flywheel. Everytime someone gets rid of the dual mass turd they complain about that rpm range giving vibes. Mine does it too (Monster 14 lb fw/stage 3 clutch) I've gotten so used to it, I think it's normal.

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    DougNuts is offline Cadillac Owners Fanatic
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by lollygagger8 View Post
    Try reindexing your driveshaft. You always want to mark where it sits before you remove it.
    I've thought about it, but I've never heard of a driveshaft issue occurring in 6 different gears at the same RPM. Driveshaft issues typically occur in relation to vehicle speed (i.e. driveshaft speed).

    Quote Originally Posted by lollygagger8 View Post
    My guess is it is the LS7 flywheel. Everytime someone gets rid of the dual mass turd they complain about that rpm range giving vibes. Mine does it too (Monster 14 lb fw/stage 3 clutch) I've gotten so used to it, I think it's normal.
    I had the same issue before I did anything to the car. I've spent $2000 fixing what are three common failure modes on our cars and now I'm left scratching my head. I don't see how it could be anything after the transmission input shaft. That only leaves the tune or balance of the engine...

  12. #11
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    Re: 2100-2350RPM Vibration fix is eluding me

    I agree on the flywheel... if it's an RPM thing then it makes sense

  13. #12
    DougNuts is offline Cadillac Owners Fanatic
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by Skidmarcx View Post
    I agree on the flywheel... if it's an RPM thing then it makes sense
    Again, the car did it with the stock flywheel and with the LS7 flywheel.

  14. #13
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    silver02stang is offline Cadillac Owners Enthusiast
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by lollygagger8 View Post
    Correct.



    My guess is it is the LS7 flywheel. Everytime someone gets rid of the dual mass turd they complain about that rpm range giving vibes. Mine does it too (Monster 14 lb fw/stage 3 clutch) I've gotten so used to it, I think it's normal.
    I noticed the same thing when I went to a Monster STG II w/ lwfw.... I'd be curious to see if an ATI dampner added the same time this clutch swap is done would address the vibes.

  15. #14
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by DougNuts View Post
    Again, the car did it with the stock flywheel and with the LS7 flywheel.
    When you installed the LS7 flywheel, did you install a new clutch disc and pressure plate at the same time?

  16. #15
    DougNuts is offline Cadillac Owners Fanatic
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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by darkman View Post
    When you installed the LS7 flywheel, did you install a new clutch disc and pressure plate at the same time?
    Of course, LS7 slave cylinder too.

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