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2004-2007 Cadillac CTS-V General Discussion Discussion, clutch and rpm issues!! please help in Cadillac CTS-V Series Forum - 2004 - 2007; Originally Posted by wcryan I think that is why the dealership could not figure it out for 6 months. I ...
  1. #16
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: clutch and rpm issues!! please help

    Quote Originally Posted by wcryan View Post
    I think that is why the dealership could not figure it out for 6 months. I finally had to tell them myself from people telling me on here and LS1tech. I dont think it has to do so much with it not being mated together in some way with the throttle, but the clutch knowing if it's fully engaged or not from a broken sensor. The sensor has to be good for something that has to do with the clutch. I wasnt totally explained what it was doing, but everyone I have talked to get's the issues; especially the rev matching and hanging throttle. It would be cool to get a low down of why it actually causes these symptoms
    One common denominator between these circuits, that is not delineated on the electrical diagrams is the ECM itself. So, it is possible, I suppose that if the ECM does not detect the clutch switch operation that it "expects" that it does something different. Perhaps a tuner could chime in on that possibility.

  2. #17
    wcryan is offline Cadillac Owners Connoisseur
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    Re: clutch and rpm issues!! please help

    Quote Originally Posted by darkman View Post
    One common denominator between these circuits, that is not delineated on the electrical diagrams is the ECM itself. So, it is possible, I suppose that if the ECM does not detect the clutch switch operation that it "expects" that it does something different. Perhaps a tuner could chime in on that possibility.
    If that's the case. Maybe that's why everytime I disconnected and reconnected my battery for an hour or so, it would go away. I think were getting somewhere

  3. #18
    06BlackV is offline Cadillac Owners Fanatic
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    thanks everyone for ur input , unfortunately its a guessing game for me , my cruise control does work so with that being said , im assuming the clutch position sensor is fine , i have no code yet , ive beat up my boxing bag at home trying to figure this out without relying on the ripoffs at dealerships and local shops :/

  4. #19
    darkman's Avatar
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    Re: clutch and rpm issues!! please help

    Quote Originally Posted by 06BlackV View Post
    thanks everyone for ur input , unfortunately its a guessing game for me , my cruise control does work so with that being said , im assuming the clutch position sensor is fine , i have no code yet , ive beat up my boxing bag at home trying to figure this out without relying on the ripoffs at dealerships and local shops :/
    Well, one simple thing to try would be to disconnect the battery for 30 minutes to clear the ECM, and see whether the symptom goes away temporarily.

  5. #20
    RADEoN is offline Banned
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    Re: clutch and rpm issues!! please help

    i'm skeptical that it's the CPS, to be honest. I really think it's a clutch or even hydraulic issue.

    I could be wrong, though.

  6. #21
    wcryan is offline Cadillac Owners Connoisseur
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    Re: clutch and rpm issues!! please help

    Try the battery method and get back to us...... Unhook it for about 30-40 minutes and hook it back up and go take it for a drive

  7. #22
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    Re: clutch and rpm issues!! please help

    Quote Originally Posted by RADEoN View Post
    i'm skeptical that it's the CPS, to be honest. I really think it's a clutch or even hydraulic issue.

    I could be wrong, though.
    Hang around - you may be right. Diagnosing over the internet is always a crap shoot.

  8. #23
    06BlackV is offline Cadillac Owners Fanatic
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    i work the graveyard shift, but first thing in the morning , i will unhook the battery and let u guys know what happends ,, thanks fellas

  9. #24
    wcryan is offline Cadillac Owners Connoisseur
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    Re: clutch and rpm issues!! please help

    I'll cross my fingers for ya

  10. #25
    06BlackV is offline Cadillac Owners Fanatic
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    ok i had time to disconnect the battery here at work , i connected it , then on my break , i drove it and no more RPM issue , but the clutch still having hard time with the downshift so i checked the clutch reservoir and its about 3/4 of an inch from the max level , its low, could this be the problem

  11. #26
    wcryan is offline Cadillac Owners Connoisseur
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    Re: clutch and rpm issues!! please help

    replay in words to me what it is doing during downshifts again?

  12. #27
    06BlackV is offline Cadillac Owners Fanatic
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    up shifting is very good , no problems, when im at speeds about 35 mph or higher and i want to down shift , it doesnt want to go in any gears , when it slows below 35mph , i dont have this problem down shifting

  13. #28
    mstrjon32 is offline Cadillac Owners Enthusiast
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    Re: clutch and rpm issues!! please help

    I was just reading this thread and it struck a disturbing chord with me. My SES is on (don't have a code scanner to read the code, yet), the cruise control won't engage, and I've noticed recently that I feel like it's impossible to get a smooth rev-match. After reading this I feel like I'm going to finally get the code pulled and it's going to say CPS.

    I need to get a scanner and figure out what's going on with this code.

  14. #29
    wcryan is offline Cadillac Owners Connoisseur
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    Re: clutch and rpm issues!! please help

    the cruise control is the tell tale sign that it is your clutch position sensor. Also the when it's hard to rev match going up and down in gears..... Good thing it's a 40$ part

  15. #30
    06BlackV is offline Cadillac Owners Fanatic
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    i just found out that when it is cold , the rpms and downshifting works better than when it warms up , and my cruise control does work .,

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