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  1. #1
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    1st gear shifting early?

    Hey guys.


    Just ran into an issue this morning that I haven't been able to troubleshoot. Whether the car is tuned or not, first gear in M1 is shifting at 4000 instead of 4500 (like the rest of the gears). This happens whether tuned or stock. I've tried clearing codes, resetting the transmission (although this shouldn't matter when in M1 or DS), ECU Reset through the BT (this doesn't seem to do anything, as there's no ECU reset specific to the ECU itself, only specific modules), resetting the fuel adaptation, etc...everything I can think of.


    In addition. I'm seeing decreased power across the range, regardless of tune or stock. The car just doesn't seem to be running the way it should (and it was running nice and quick last night).


    Finally, I'm seeing a Shadow Code 44CF that's popping up even when stock (and this is the first time I've ever seen a Shadow Code on the car), and I can't seem to find what the code means.


    If anyone has any input or feedback, I'm all ears.


    EDIT: I've also found that if I don't WOT, it shifts when it should, but there's still a definitive lack of acceleration, too. Adding videos to show what's going on.



    Click here to enlarge

  2. #2
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    hmm that is odd... do you have the same auto thats in the N54 cars? Im assuming your gear ratios are vastly different being that it is diesel. Strange though, how it shifts early in first.
    Some people live long, meaningful lives.

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    I'm not racist, I hate everybody equally; especially fat people.


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  3. #3
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    The tranny in the d is the same as the 5 series 6 speed, because of the torque rating. ZF 6HP28.
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  4. #4
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    This is when you're flooring it? Are you also in DS mode?

  5. #5
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    Manual, not DS.
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  6. #6
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    Bump, no idea.

  7. #7
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    The car is going to the dealership on Thursday, so we'll see what they have to say.
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    I've gotten some insight as to what might be wrong. As I was driving today, I got an error on the dash that turned out to mean the DPF is malfunctioning. This may be an indicator as to what's going on, but I won't know for sure at least until Thursday.
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  9. #9
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  10. #10
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    Click here to enlarge Originally Posted by Ronin Click here to enlarge
    I've gotten some insight as to what might be wrong. As I was driving today, I got an error on the dash that turned out to mean the DPF is malfunctioning. This may be an indicator as to what's going on, but I won't know for sure at least until Thursday.
    Wait, sorry, DPF?

  11. #11
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    something specific to diesel i believe. i believe its the filter. that makes sense, diesel particulate filter.
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    2007 335i Coupe
    Mods: Check the Garage

  12. #12
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    gotta get rid of that thing and roll coal like the big boys! Let us know what you find out on Thursday.

  13. #13
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    Ok, ran the car tonight about 40 miles up and down the highway, and checked codes before, during, and after. Before, all codes were clear (I cleared them out a couple of days ago, and I rode my Gixxer 6 to work today....got some nice compound tires put on it today, too...Click here to enlarge).


    Below are the codes that are currently on the car (no shadow codes this time around, which may be a good or bad thing...I don't know):


    4BF4:


    Error will cause a warning light
    Error is not currently present
    Test conditions have been completed
    Short circuit or signal interruption

    480A:


    Error will not cause a warning light
    Error is currently present
    Test conditions have been completed
    Short circuit or signal interruption

    481A:


    Error will not cause a warning light
    Error is currently present
    Test conditions have been completed
    Short circuit or signal interruption

    4D00:
    Exhaust gas back pressure sensor
    Error will not cause a warning light
    Error is not currently present
    Test conditions have been completed
    Short circuit or signal interruption

    4530:
    Air charge control, deviation
    Error will not cause a warning light
    Error is not currently present
    Test conditions have been completed
    Short circuit or signal interruption

    429A:


    Error will not cause a warning light
    Error is not currently present
    Test conditions have been completed
    Short circuit or signal interruption

    I got the DPF error again, as well as limp mode once, during the drive.
    Click here to enlarge

  14. #14
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    wow man get her to your local respected shop, or the stealer if you're warrantied.
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    2007 335i Coupe
    Mods: Check the Garage

  15. #15
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    First thing tomorrow morning. Appointment's at 7.
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  16. #16
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    No idea what those are Ronin but I take it you are still in your warranty period.

  17. #17
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    Almost 55k on the clock, so no, I'm not. I renewed the maintenance, but didn't have any inclination for needing to get the warranty renewed. If there's seriously something wrong with the car, BMW and I are going to go at ends. The diesel system is too new, and needed to be tested better, if this is the kind of stuff that's going to happen to it.

    We'll see what the dealership says.
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  18. #18
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    Well, just got 3 emails with the following:

    {{191JCOCHRELL}}
    Customer No. 46339

    SPECIAL ORDER PART# DESCRIPTION QORD
    BM18-20-7-793-677 CLAMP 1

    SPECIAL ORDER PART# DESCRIPTION QORD
    BM18-30-7-793-678 GASKET 1

    SPECIAL ORDER PART# DESCRIPTION QORD
    BM18-30-7-808-655 AT-DIESEL PARTICULAT 1

    I'd say that last part is pretty telling....they haven't called yet, though. Does anyone know whether or not there's some sort of longer warranty on parts specifically designed to meet/exceed CARB requirements?
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  19. #19
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    Clamp, gasket, particulate... interesting.

  20. #20
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    1 out of 1 members liked this post. Yes Reputation No
    The third part is the DPF. I just got a call back, and because the DPF is an emissions part, it's covered by a different warranty (8yr/80k), so the $1500 they would have charged me for it doesn't need to be spent.
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  21. #21
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    Click here to enlarge Originally Posted by Ronin Click here to enlarge
    The third part is the DPF. I just got a call back, and because the DPF is an emissions part, it's covered by a different warranty (8yr/80k), so the $1500 they would have charged me for it doesn't need to be spent.
    Click here to enlarge Bet you are happy.

  22. #22
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    Yes and no. Now I have to wait and see if swapping out the part actually fixes the problem, and pray that there was no other damage done as a result.
    Click here to enlarge

  23. #23
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    1 out of 1 members liked this post. Yes Reputation No
    As some additional information, it appears there was soot buildup in the DPF, presumably from a lack of long distance driving. The car needs a good run every once in a while to flush itself out.
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  24. #24
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    1 out of 1 members liked this post. Yes Reputation No
    Ok...so I've got word that the part is swapped out and the car is back to it's normal self (I'll know after I pick it up..won't be until tomorrow morning). What was happening is that the soot build-up as a result of a lack of decent regen cycle created backpressure on the exhaust, causing all the other problems I was seeing. I'm still waiting to see what sort of timeframe and length should be needed in order to prevent the build-up in the future, but my guess is a good 50-60 mile drive once a week should be sufficient.
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  25. #25
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    Click here to enlarge Originally Posted by Ronin Click here to enlarge
    Ok...so I've got word that the part is swapped out and the car is back to it's normal self (I'll know after I pick it up..won't be until tomorrow morning). What was happening is that the soot build-up as a result of a lack of decent regen cycle created backpressure on the exhaust, causing all the other problems I was seeing. I'm still waiting to see what sort of timeframe and length should be needed in order to prevent the build-up in the future, but my guess is a good 50-60 mile drive once a week should be sufficient.
    If you ran an aftermarket exhaust wouldn't that reduce the backpressure and soot build up?

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