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Thread: accelerator issues

  1. #1
    kodak is offline Cadillac Owners Member
    Automobile(s): 1999 Deville
    Join Date
    Mar 2013
    Posts
    15

    accelerator issues

    I have a 99 DeVille thats likes to accelerate without my foot on the accelerator. RPM over 3,000. I had to shut down the car. once I started it back it was back to normal. Sometimes I can kick it down. I have disconected the cruse control. and replaced the throtle control unit ($350.00) Still a problem. I can drive for days and it runs fine.
    I pulled the codes
    pmc 1654
    tcs c 1225 or 1225


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  3. #2
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Master
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
    Join Date
    Feb 2012
    Location
    NC
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    6,697
    Definitions for codes?

  4. #3
    kodak is offline Cadillac Owners Member
    Automobile(s): 1999 Deville
    Join Date
    Mar 2013
    Posts
    15

    Re: accelerator issues

    where can I find them ?

  5. #4
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Location
    Metro ATL
    Posts
    4,854

    Re: accelerator issues

    Quote Originally Posted by kodak View Post
    I have a 99 DeVille thats likes to accelerate without my foot on the accelerator. RPM over 3,000. I had to shut down the car. once I started it back it was back to normal. Sometimes I can kick it down. I have disconected the cruse control. and replaced the throtle control unit ($350.00) Still a problem. I can drive for days and it runs fine.
    I pulled the codes
    pmc 1654
    tcs c 1225 or 1225
    Your C1225 is the first code to address.

    C1225 - Left Front Excessive Wheel Speed Variation

    Either a nasty dirty hub wheel speed sensor connector OR a failing wheel speed sensor which requires hub replacement to repair.

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,262

    Re: accelerator issues

    Clean the TB first.

  7. #6
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    25
    Posts
    3,993

    Re: accelerator issues

    This happened long ago in my Deville before I took over the ownership. It received no TB cleaning since 1999. I cleaned the TB and it never happened again. Now I clean mine once in every year.

  8. #7
    Mojo88's Avatar
    Mojo88 is offline Cadillac Owners Fanatic
    Automobile(s): 2003 White Diamond DeVille 'Base'
    Join Date
    Dec 2011
    Location
    Newport, RI
    Age
    65
    Posts
    347

    Re: accelerator issues

    Clean the TB and check/lube the throttle cable.

    Also, make sure the carpeting (or residue from carpet or shoes) is not interfering with the pedal. Pedal should be nice and free, with no sticking at all.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,262

    Re: accelerator issues

    Lube attracts and holds dirt. I don't believe the throttle cables are intended to be lubed.


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