Deville 04 No code misfire - Page 2
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Deville 04 No code misfire in Past Cadillac Vehicle Discussion; checked for vaccum leaks and again no luck !!!! FYI: Before I replaced any coil before 2 months I scanned ...
  1. #16
    LeaderX11's Avatar
    LeaderX11 is offline Cadillac Owners Fanatic
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    Re: Deville 04 No code misfire

    checked for vaccum leaks and again no luck !!!!

    FYI: Before I replaced any coil before 2 months I scanned the car and found that CYL 5 (severe) and CYL 6 (which was small mise) are mising ....
    After that I replaced full rear coils and use one of the three remaining good coils to replace coil number 6 .....

    Before two weeks misfire back again, and without any scanning I directly replace the 4 old remaining coils in the front side of the engine with a new 4 coils, to made myself rest ....
    And after many days misfire came back but when only AC is ON !!! And I wrote this post....
    __________________________________________________ __________________________________________________ _____________________________


    Today I finshed scanning the car with OBD II advanced scanner and Surprisingly I found 3 error codes !!!!! ( SES light is not present at all )
    Although that I used the regular way to pull the codes before I went to the shop and found nothing related to PCM current or even History errors !!!

    O.K now I have strong misfire in CYL 5 and a small one in CYL 6 !!!!! so what does this mean ?
    I recently replaced all 8 coils ,,,,

    Error codes are :
    PO102 - MASS AIR FLOW (MAF) SENSOR CIRCUIT LOW FREQUENCY**
    P0121 - THROTTLE POSITION (TP) SENSOR
    P0300 - ENGINE MISFIRE DETECTED
    ** I disconnect MAF sensor to know if it related to the problem or no ,,, then I reconnect it ,,so this may be the reason for P0102 code ....

    Now I'll check spark plugs and may replace it ......

  2. #17
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    Re: Deville 04 No code misfire



    CYL 5 spark plug ....

    Misefiring problem solved !!!!!
    It caused by bad plugs ..

    Next time I will advise every one who going to replace coils to replace plugs as well .
    This will decrease the possibilities of more losses ,,, like me ...
    I replaced all coils and the real cause of the problem was some bad plugs ...


    Thanks Ranger ,,,,
    I really appreciate the work and advises given to me for free and to all of other askers .....

  3. #18
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    Re: Deville 04 No code misfire

    That plug appears to be carbon tracked down the side. If that is a carbon track, then the boot will also be carbon tracked and will soon transfer it back to the new plug if it was not changed with the plug.

  4. #19
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    Re: Deville 04 No code misfire

    Wow , what is the cause of this "carbon tracked" ?
    Rear coils bank is replaced before 2 months ..... The old coils boot (factory one) for coils 5 is really damaged !!!
    and dont know where is my mind to not check the plug too !!!

    Now, I inspected the current rear bank coils which may be 2 months old and they look as a new ....
    so, is this period(2 months) enough to already damage the new boots ?

    This operation cost me a lot and I dont want to be involved in later same problem losses !!!
    So, is there anything I should do now ?

    __________________________________________________ __________________________________

    I w'll find the old coil 5 and take a picture of it ....

  5. #20
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    Re: Deville 04 No code misfire

    I don't know how long it takes for a carbon track to reestablish itself on a new component. Carbon tracking occurs when the spark finds less resistance by traveling down the side of the plug rather than through it. Not exactly sure what causes that. Probably an internal failure in the plug. That said, I am not 100% sure whether that picture shows a carbon track or not. A carbon track is usually VERY thin and is commonly mistaken for a hail line crack in the porcelain. Yours is different, but does look a bit suspicious. Lets see if anyone else agrees or not.

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