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 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
    Join Date
    Feb 2010

    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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  3. #2
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Cadillac Eldorado ETC
    Join Date
    Aug 2010
    Kennewick WA
    Did you put AC Delco Plugs and Wires? These engines dont like anything else.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 F150 SuperCab 4x4
    Join Date
    Feb 2006
    MD Eastern Shore

    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 online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    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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