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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
    LeaderX11's Avatar
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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.

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  5. #19
    LeaderX11's Avatar
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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 ....

  6. #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.

  7. #21
    LuckyMan is offline Cadillac Owners Member
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    Re: Deville 04 No code misfire

    For the record, here is my situation: Misfires below 2000rpm, no codes. I found the vent hose had hardened and broke from the nipple on the case. (See picture below) The check valve at the end of the hose is propped up by a plastic clamp near the throttle body. I didn't see that the other end was disconnected until I removed the air cleaner assembly. Explains the "misfires" below 2000 rpm and no code.
    20170308_173004_resized.jpg

    EDIT:
    See post #25

  8. #22
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    Re: Deville 04 No code misfire

    Quote Originally Posted by LuckyMan View Post
    For the record, here is my situation: Misfires below 2000rpm, no codes. I found the vent hose had hardened and broke from the nipple on the case. (See picture below) The check valve at the end of the hose is propped up by a plastic clamp near the throttle body. I didn't see that the other end was disconnected until I removed the air cleaner assembly. Explains the "misfires" below 2000 rpm and no code.
    this is a five year old thread; the OP hasn't been on in two years; not likely he'll see it.

  9. #23
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    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Deville 04 No code misfire

    Post #21 is incorrect information.

    ......... that hose and wiggle cap has absolutely NO relation to engine performance or fuel/air mixture problems.

    It's the atmospheric transmission vent. The reason it's vertically clipped to the throttlebody bracket is to prevent transmission fluid blowout or siphoning.

    The FPR vacuum source comes from the top of the throttlebody casting. If any of those plastic pipes are cracked/broken they, and their rubber connectors, can be replaced with a single length of proper-sized vacuum hose from any parts store - the Help! racks.
    Attached Images

  10. #24
    RON93 is offline Cadillac Owners Fanatic
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    Re: Deville 04 No code misfire

    Just happened to read this and your going to tell me that the OP never checked a plug to see if that was causing the trouble? He just assumed they were good because he changed them one year prior? Then he comes on here with his solution like he found the holy grail of misfires, a bad plug. Give me a break. Always look for the obvious and common causes first.
    1969byrdman likes this.

  11. #25
    LuckyMan is offline Cadillac Owners Member
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    Re: Deville 04 No code misfire

    Yeah, my mistake. Post #21 is incorrect. It did not correct the misfire. I hastily took the car for a ride after replacing the hose without a chance to heat up. The misfire is still there. Can a moderator remove the post? Thanks.

  12. #26
    425c10 is offline Cadillac Owners Member
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    Re: Deville 04 No code misfire

    I chased down a crank shaft sensors in my 2002 base deville and you know it stall at any mysterious time but no code sinses 2008 now this winter
    it throw a code yep crank shaft senors . now that tells us a lot it can do all that and no codes . But 9 years later so it can be very mysterious .
    I know in 2004 they changed style of crank shaft sensor .

    425c10

  13. #27
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    Re: Deville 04 No code misfire

    Quote Originally Posted by LuckyMan View Post
    Yeah, my mistake. Post #21 is incorrect. It did not correct the misfire. I hastily took the car for a ride after replacing the hose without a chance to heat up. The misfire is still there. Can a moderator remove the post? Thanks.
    No need to remove stuff - it's all in sequence and if someone reads the entire thread while looking for info they'll learn a lot more than just the basic fix.

  14. #28
    Ranger's Avatar
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    Re: Deville 04 No code misfire

    Quote Originally Posted by LuckyMan View Post
    Yeah, my mistake. Post #21 is incorrect. It did not correct the misfire. I hastily took the car for a ride after replacing the hose without a chance to heat up. The misfire is still there. Can a moderator remove the post? Thanks.
    I added an edit to your post #21 so no one stops there.

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