1994 Deville smog problem.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 1994 Deville smog problem. in Past Cadillac Vehicle Discussion; Bought my first car a couple months ago. 94 Cadillac deville concours. Love the car but made bad purchase. Bought ...
  1. #1
    jmanuel's Avatar
    jmanuel is offline Cadillac Owners Member
    Automobile(s): 1994 Cadillac Deville Concours
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    1994 Deville smog problem.

    Bought my first car a couple months ago. 94 Cadillac deville concours. Love the car but made bad purchase. Bought car not knowing it wasnt smogged. Iwent to go register it and they said to get it smogged to complete registration in my name. Car had leak.. fixed it. Got a new battery. Put brand new starter. Car idles rough and failed smog? Now what. I feel stuck on my stupid purchase. Any advise?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1994 Deville smog problem.

    Might not be as bad as you think. First pull the DTC's. Post them AND their definitions and we should be able to help you.

    P.S.
    If it failed they should have given you the test results and why it failed. Post that as well.

  4. #3
    jmanuel's Avatar
    jmanuel is offline Cadillac Owners Member
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    Thread Starter
    He didnt fail me. He just told me it wont pass cause it idles rough and has a smell?
    Heres the codes
    A012 low side temp sensor circuit
    S038 electrical level control exhaust valve short to ground/open.
    S060 left front position sensor fault?

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1994 Deville smog problem.

    None of those codes wold fail an emissions test. In fact, none are even engine related.

    Might start with a good TB cleaning.

  6. #5
    jmanuel's Avatar
    jmanuel is offline Cadillac Owners Member
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    Thread Starter
    Really? Thats weird then.
    How much would that cost? Dont think im capable of doing it myself.
    Could it be as simple as a loose vacum hose? And how could i tell?

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1994 Deville smog problem.

    Cleaning the TB is easy. I believe there is a tutorial in the Tech Tips section.

    If you suspect a vacuum leak, which could cause a condition that would fail it, spray some Brakleen or such around all the possible vacuum leak points. The RPM will increase when (if) you spray at a vacuum leak

    As mentioned in post #2, this diagnosis would be much easier if you had the readout they gave you after the test. It should give you all the readings and which ones failed, thus making it easier to figure out.

  8. #7
    carnut is offline Cadillac Owners Master
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    Re: 1994 Deville smog problem.

    Spend the $100 or so to have it diagnosed. If you are unable to diagnose it yourself its money well spent. A fuel injected engine with a vacuum leak normally idles faster not rougher. Now we know why he sold it!!!

  9. #8
    jmanuel's Avatar
    jmanuel is offline Cadillac Owners Member
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    Thread Starter
    Well ill try to watch tutorial an if it looks easy enough ill do it but if anything ill probably take it to a shop. Ishouldve told just to do.it anyways he said he didnt wana charge me since he knew itd fail.

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