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Thread: Cold Start Z4 E85 Problem?

  1. #1
    Join Date
    Feb 2017
    Location
    NC
    Posts
    15
    My Cars
    2004 BMW Z4 3.0i

    Cold Start Z4 E85 Problem?

    Suggestions WANTED to Z4 E85 starting issue.


    04 Z4 E85 with 23,800 miles bought used in 07 with 15K miles.
    No service other than oil changes.


    Problem presentation has been over the past 18 months so now is time to fix.


    Problem when car is cold and upon start after about 20 seconds engine has major skip and may continue to run for another 15 to 20 seconds and then will often cut off. After 2 or 3 more cycles of starting , running engine for 10 to 15 seconds the engine will then continue to run fine and then throughout the day no starting problems will be experienced.


    Occasionally in one of those +/- 5 starting cycles engine will start and run but with very rough idle ( pressing gas pedal does not change RPMs) requiring that I perform a manual throttle reset that will often result in the next start as normal with no unwanted engine shut offs.


    Manual throttle reset procedure:
    1. Press pedal to floor.
    2. Turn ignition to position 3. Non cranking position.


    1. Wait 30 seconds with pedal to floor.




    1. After 30 secs. remove key and let off pedal.
    2. Wait 30 seconds and then start.


    Today I started the dance again, but first cleared all codes.


    First crank I was presented with the rough idle problem described above.




    Read codes:
    DME codes present:
    28B2 Speed limitation reset
    27AT Throttle Starting test
    2796 Throttle: Adaptation Value is Incorrect


    Cleared Codes.


    Performed Manual Throttle Reset.


    Started Ok with normal RPM at around 10K but started to drop to 9K and then major skip, but engine did not shut off, ran another +/-15 seconds and then engine shut down. Did not recrank.


    Checked Codes same as above:
    28B2 Speed limitation reset
    27AT Throttle Starting test
    2796 Throttle: Adaptation Value is Incorrect


    Cleared Codes.
    Restarted and this time started fine and ran fine with no shut downs.


    Read codes and no trouble found.


    My research from previous threads indicates I may need a DME board refresh at about 1 K in cost.
    My local mechanic that owns several BMWs indicated I may need a throttle body cleaning.
    My mechanic has so many cars in his lot it may be another 18 months before he can take a closer look.




    Your suggestions may help in the ultimate repair.


    Thanks
    Last edited by Charles S; 10-07-2018 at 05:52 AM.

  2. #2
    Join Date
    Apr 2011
    Location
    Douglasville Ga
    Posts
    45
    My Cars
    04 Z4 3.0i 6MT
    I had exactly the same issue. The throttle adaptation is on a flash chip and my indie said the ECU couldn't be rebuilt. But then I found an ad from RPM Motorsports in Victoria BC which claimed they could repair the DME. Sent them mine a couple of months ago and running fine ever since. Plug and play, cost was under $500.

    BMW MS45.0 / MS45.1 ECU Repair (DME RAM Checksum Error)

  3. #3
    Join Date
    Feb 2017
    Location
    NC
    Posts
    15
    My Cars
    2004 BMW Z4 3.0i
    Ok thank you for your suggestion.
    I will reach out to RPM.

  4. #4
    Join Date
    Apr 2011
    Location
    Douglasville Ga
    Posts
    45
    My Cars
    04 Z4 3.0i 6MT
    Why do you have two threads running for the same problem?

  5. #5
    Join Date
    Feb 2017
    Location
    NC
    Posts
    15
    My Cars
    2004 BMW Z4 3.0i
    Sorry my first time posting a thread and so I posted message into 2 different forums or I just duplicated it to start. Not sure how to delete one of the threads....

  6. #6
    Join Date
    Feb 2017
    Location
    NC
    Posts
    15
    My Cars
    2004 BMW Z4 3.0i
    Once I delete this thread then will take your suggestion and add to they other thread.

  7. #7
    Join Date
    Apr 2011
    Location
    Douglasville Ga
    Posts
    45
    My Cars
    04 Z4 3.0i 6MT
    Thank you. Good luck.

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