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Thread: 2009 DTS Engine shakes when waiting at the light

  1. #1
    Abecadillac2009's Avatar
    Abecadillac2009 is offline Cadillac Owners Member
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    2009 DTS Engine shakes when waiting at the light

    Hello everyone. I need your help.
    I have a 2009 Cadillac DTS with 180K miles.
    Recently I have noticed that while waiting at a light or in Park the engine shakes a bit.
    I recently changed the spark plugs, fuel injectors (all 8) but to no avail.

    Please advise


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  3. #2
    Superjim's Avatar
    Superjim is offline Cadillac Owners Connoisseur
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    Re: 2009 Cadillac DTS Engine shakes when waiting at the light

    Quote Originally Posted by Abecadillac2009 View Post
    Hello everyone. I need your help.
    I have a 2009 Cadillac DTS with 180K miles.
    Recently I have noticed that while waiting at a light or in Park the engine shakes a bit.
    I recently changed the spark plugs, fuel injectors (all 8) but to no avail.

    Please advise
    Go to Autozone (or some place like that) and have the codes pulled.
    WRITE THEM DOWN, and then post them here.
    The codes will tell why it is missing.

  4. #3
    Abecadillac2009's Avatar
    Abecadillac2009 is offline Cadillac Owners Member
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    Quote Originally Posted by Superjim View Post
    Go to Autozone (or some place like that) and have the codes pulled.
    WRITE THEM DOWN, and then post them here.
    The codes will tell why it is missing.
    Thanks for responding

    I went to Auto Zone but they couldn't pull the codes because the check engine light is not on.

  5. #4
    Superjim's Avatar
    Superjim is offline Cadillac Owners Connoisseur
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    Re: 2009 DTS Engine shakes when waiting at the light

    Quote Originally Posted by Abecadillac2009 View Post
    Thanks for responding

    I went to Auto Zone but they couldn't pull the codes because the check engine light is not on.
    Actually they can... if they plug in their hand held reader, they can also read HISTORY codes.

  6. #5
    Andrew224's Avatar
    Andrew224 is offline Cadillac Owners Fanatic
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    Re: 2009 DTS Engine shakes when waiting at the light

    Try reading through this and see if this sounds like your problem...

    http://www.cadillacforums.com/forums...m-misfire.html

  7. #6
    Abecadillac2009's Avatar
    Abecadillac2009 is offline Cadillac Owners Member
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    Quote Originally Posted by Andrew224 View Post
    Try reading through this and see if this sounds like your problem...

    http://www.cadillacforums.com/forums...m-misfire.html
    Thank you. I will revisit Autozone for the codes. Also thanks for the link.

  8. #7
    Abecadillac2009's Avatar
    Abecadillac2009 is offline Cadillac Owners Member
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    I tried MAP sensor but no it remains the same.
    I went back to Autozone but they couldn't find any codes in the history.

    Any other suggestions.

  9. #8
    tjwhite721's Avatar
    tjwhite721 is offline Cadillac Owners Fanatic
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    Maybe try the PCV value or hose? Its the hose that goes across the engine when you take the cover off. Its a black long one. When it goes bad your car will shake when idling. I believe it sits towards the rear of the engine. You can only get it from GM. Not an aftermarket part.

  10. #9
    Abecadillac2009's Avatar
    Abecadillac2009 is offline Cadillac Owners Member
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    Thank you. I will call the dealer for the part.

  11. #10
    Abecadillac2009's Avatar
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    It's not the PCV valve either.
    Please help

  12. #11
    RicktheRealtor is offline Cadillac Owners Fanatic
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    Re: 2009 DTS Engine shakes when waiting at the light

    Are engine mounts ok?

  13. #12
    Abecadillac2009's Avatar
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    I changed the engine and Transmission Mounts about six months ago

    ----------

    Quote Originally Posted by Abecadillac2009 View Post
    I changed the engine and Transmission Mounts about six months ago
    Actually, I didn't change the top engine mount.

  14. #13
    tjwhite721's Avatar
    tjwhite721 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Abecadillac2009 View Post
    It's not the PCV valve either.
    Please help
    You either have a vaccum or exhaust leak, strut or mount failure, throttle body, or something with the spark plugs.

  15. #14
    Abecadillac2009's Avatar
    Abecadillac2009 is offline Cadillac Owners Member
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    Awesome news
    I finally got the issue resolved.
    It was coil #1. After pulling it out the mechanic realized that the boot was ripped. He replaced it and it's now all good.

    Thank you everyone for your help.

    Best regards

  16. #15
    RicktheRealtor is offline Cadillac Owners Fanatic
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    Re: 2009 DTS Engine shakes when waiting at the light

    Great news. Glad it's fixed.

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