2003 CTS Starting and engine issue
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2003 CTS Starting and engine issue in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Hi, I have a 2003 CTS and it worked great until recently. I went to start it one day and ...
  1. #1
    raymondwhite24 is offline Cadillac Owners Member
    Automobile(s): 2003 CTS
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    2003 CTS Starting and engine issue

    Hi, I have a 2003 CTS and it worked great until recently. I went to start it one day and it started really rough and ran with a knocking sound. I shut it off and now when I try to start it I have an extended crank until it starts and the knocking persists. I have had the valve covers off and the mechanic said that the valves look fine and he would have to guess at what is wrong. Does any one know what this might be? I was told that replacing the entire engine would be the best choice but I would rather not do that. Does anyone know what happens if the camshaft position sensor is bad?

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  3. #2
    Calgary03's Avatar
    Calgary03 is offline Cadillac Owners Member
    Automobile(s): 03 Cts Sport Luxury
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    Probably crankshaft position sensor. Very common on the 03.

  4. #3
    raymondwhite24 is offline Cadillac Owners Member
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    Re: 2003 CTS Starting and engine issue

    That is what I was thinking, are they hard to do? Also is it possible that a timing belt malfunction cause this?
    thanks for your help

  5. #4
    djkdawg's Avatar
    djkdawg is offline Cadillac Owners Fanatic
    Automobile(s): 2005 cts 3.6L
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    Re: 2003 CTS Starting and engine issue

    if you need the steps on how to change it, shoot me a pm with your email and i will check the manual for your car and get you some instructions

  6. #5
    Calgary03's Avatar
    Calgary03 is offline Cadillac Owners Member
    Automobile(s): 03 Cts Sport Luxury
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    Quote Originally Posted by raymondwhite24
    That is what I was thinking, are they hard to do? Also is it possible that a timing belt malfunction cause this?
    thanks for your help
    I wouldn't say it's hard but if you have big hands at all then it could be tricky. You have to snake your arm around the catalytic converter and feel for the bolt. You won't be able to see it. As for the timing belt, if it skipped a tooth your engine would probably be toast and not run at all. Cost me $50 for the part, $10 for a 6 pack of beer and an hour and a half of my time. Could probably do it in 30 minutes now though.

  7. #6
    jran0823's Avatar
    jran0823 is offline Cadillac Owners Enthusiast
    Automobile(s): 2003 CTS 1SC Luxury Sport
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    I wouldn't say crankshaft position sensor. That wouldn't cause knocking, knocking is cause by either lack of lubrication, detonation or timing being off. I would start by taking the timing cover off and lining up marks. I'd put my money there.

  8. #7
    raymondwhite24 is offline Cadillac Owners Member
    Automobile(s): 2003 CTS
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    Re: 2003 CTS Starting and engine issue

    thanks

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