Check engine light won't go away???
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Northstar Engines and System Technical Discussion Discussion, Check engine light won't go away??? in Cadillac Engine Technical Discussion; Hey guys......failed inspection due to cat converter. Replaced with an aftermarket converter and also changed the spark plugs. The only ...
  1. #1
    ISHDAROCK is offline Cadillac Owners Member
    Automobile(s): 2000 Deville
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    Check engine light won't go away???

    Hey guys......failed inspection due to cat converter. Replaced with an aftermarket converter and also changed the spark plugs. The only 2 codes showing are for the converter which is replaced an old code for crankshaft sensors which i did a year ago? Why wont the engine light go off? I cleared all codes on dash... Also when i come to a stop theres like a shaking going on like a gas flutter... I need help guys thanks alot

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    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    Did you put AC Delco Plugs and Wires? These engines dont like anything else.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Check engine light won't go away???

    A steady SES light is usually an intermittent miss - spark or fuel related. A flashing SES is severe misfiring.

    2000 Deville - divorced MAF - is all the intake air ducting properly hooked up and securely clamped ?? ANY air leak at or after the MAF will cause a nasty idle and may cause an intermittent misfire, which turns on the SES light.

    Did you clean out all the plug boots, check the inner connector springs and use a tad of dielectric spark plug boot grease in the tip of each one ?

    Cadillacs do not like aftermarket converters. Don't ask me why; it's black magic.

    The CKP job - Have you checked the two electrical connectors for CKP's A & B ?

    ........ and, as vincentm posted, AC Delco #41-987 Platinum plugs only.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Check engine light won't go away???

    Exactly which codes are you still getting? Where did you get the replacement CAT?

    Are the codes current or history? A year old CKP code should be history, if not deleted from history by now.

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