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Thread: 98 eldorado pcm sensor issue

  1. #1
    98eldorado313 is offline Cadillac Owners Member
    Automobile(s): 1998 eldorado
    Join Date
    Sep 2013
    Posts
    2

    98 eldorado pcm sensor issue

    I have a 1998 eldorado and after changing my exhaust to pass emissions these codes started coming on and off randomly i have changed the parts for the codes
    But still have them come up im starting to think it may be my pcm any input?

    DTC P0171 Fuel Trim System Lean Bank 1

    DTC P0174 Fuel Trim System Lean Bank 2

    DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent

    DTC P1377 IC Cam Pulse To 4X Reference Pulse


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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2003 DHS - two-2002 DHS's, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
    Join Date
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    Minnesota
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    Re: 98 eldorado pcm sensor issue

    i have changed the parts for the codes
    what parts have you changed -

    P0171 and P0174 are due to a big vacuum leak -
    get a can of carb/throttle body cleaner -
    spray around the engine while running -
    when the idle changes - you found a leak -

    pay particular attention around the elbows of the PCV hoses -

    P0503 is probably a bad plug/loose connection or frayed wire -

    P1377 is probably a bad cam sensor -

  4. #3
    98eldorado313 is offline Cadillac Owners Member
    Automobile(s): 1998 eldorado
    Join Date
    Sep 2013
    Posts
    2

    Re: 98 eldorado pcm sensor issue

    Yes sorry i changed my cam sensor p1377 my speed sensor p0503 whole icm module h02 sensor before and after cat. Ill search for a leak today and inform you once i find my issue. Thank you


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