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Old 03-17-2013, 10:08 AM   #1 (permalink)
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2004 530i stalling when cold

Hi all,
I'm new here and ive been searching all over for an answer to this problem I'm having. Its my neighbors car, a 2004 530i auto with 110k and it stalls only when its cold out. Its not driveable when its under 50* out. The car will start Rev to around 1250 hold it for 30 seconds drop to 500 go back up to 1250 and stall. Unplugged maf idle holds for a little longer before stalling. When its about mid 40's it wont stall but the car shakes violently with the rpms all over the place.

Dealer already replaced maf and ecu which didn't change anything.

Taken car to the dealer and another local bmw specialist and neither now why its doing this. There's no check engine light. Is there a way to check for codes without a scanner?

Possible solutions to the problem that ive read on the forums are:

Vanos replacement
idle control valve
Cam position sensor
crank position sensor
fuel filter
Fuel relay
Fuel pump
intake runners broken from the actuator

Now I'm no bmw specialist but ive worked on just about everything other than Euro cars. Can you guys please give me a starting point. Id rather not do diagnosing like the dealer does and just start replaceing perfectly good parts. Thanks for the help.
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Old 03-17-2013, 04:48 PM   #2 (permalink)
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Update got the dealer invoice and codes were pulled prior to the dme being replaced.

28b2, 2796, 2869, 27a1, and 299a

Hopefully this helps
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Old 03-20-2013, 06:56 PM   #3 (permalink)
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Code 2796 is "Electronic Throttle Controller Adaptation Wrong"

Here is a PDF Service Bulletin related to it:
E46Fanatics - View Single Post - OBD II code 2796 - Electronic throttle controller adaption wrong

Here is another service bulletin relating to Code 28B2:

SIB # 12 49 06

This Service Information bulletin supersedes S.I. B12 49 06 dated November 2006.
designates changes to this revision
SUBJECT
DME MS45 - FC28B2, 28AA, 28AC; Internal RAM Faults
MODEL
E46 M54 with MS45.1 from 9/00 to 7/06
E83 M54 with MS45.0/MS45.1 from 9/03 to 9/06
E85 M54 with MS45.0 from 10/04 to 1/06
E60 M54 with MS45.1 from 9/03 to 3/05
SITUATION
Customers may complain about a crank/no start or a rough start situation. The "Service Engine Soon
Light" or the DSC light is illuminated, and one of the 3 scenarios may apply:
1. FC 28B2 "rpm limiting reset " is stored in the DME together with one, or more of the following
faults which are caused by the 28B2:
***56256;***56443; FC 28AC - "nominal torque",
***56256;***56443; FC 2796 - "throttle flap: adaptation wrong",
***56256;***56443; FC 27A1 - "throttle flap: start check",
***56256;***56443; FC 2869 - "DME self diagnostic: RAM check failed".
2. FC 28AA "idle speed regulator" is stored in the DME.
3. FC 28AC "nominal torque" is stored in the DME.
CAUSE
Fault codes 28B2, 28AA and 28AC indicate an internal DME RAM fault.
PROCEDURE
Perform the appropriate DIS/GT1 test modules for the 28B2, 28AA or 28AC.
Replace the DME if prompted by the DIS/GT1 test module results.
Important: Do not replace the throttle body for the throttle faults, stored in conjunction with FC28B2,
even when the test plan recommends to do so.


From the second bulletin it sounds like a software reset is required.
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Old 03-20-2013, 07:15 PM   #4 (permalink)
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the dealer told him that the computer was bad because of the 28b2 code.

the way i interpreted it, is there is an update that needs to be flashed on the computer. but they claim its bad.

the computers new, so i think i may need to find a new dealer.

I cleaned out the idle control valve and ordered a new pcv valve. when that gets in hopefully it will be fixed.

thanks for the service bulletin, ill look into it.
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Old 03-21-2013, 05:03 PM   #5 (permalink)
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Replacing a computer would be quite expensive. If the dealer wants him to replace a "new" computer then you need to go somewhere else.
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