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2001 BMW 750Li Delayed Shifting

Tiny
DONALDLEW
  • MEMBER
  • 2001 BMW 750LI
  • V12
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
Car has ZF A5S560Z transmission, GS 9.22.1 tranmission software with M73TU motor.
After stop and go driving, shift points increase to 40 mph, 60 mph and 75 mph with no 5th gear.
Could there be a signal problem with the DME? Seems the TCM is going into adaptive program that delays upshifting because of either aggressive driving or hill climb or hill descending mode. Front tires OK.
Shifting returns to normal after engine is shut down for at least 15 minutes.
Trans oil service before and after shows clean pan and screen and fluid which is clear and not burned. No trans fault codes using Peake OBD II reader. Replaced TCM with a TCM from another 750iL, same delayed shift problem after stop and go or closed throttle hill descent.
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Friday, July 10th, 2009 AT 7:35 PM

5 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
It could be that there is a plausibility issue between the input speed sensor and the output speed sensor. It could also be a software issue, has BMW been involved?
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Saturday, July 11th, 2009 AT 9:14 AM
Tiny
DONALDLEW
  • MEMBER
  • 3 POSTS
The dealer has not been involved because I have little confidence in them. I am at Concord, California.
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Saturday, July 11th, 2009 AT 10:18 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Weatherford or East Bay are possibilities too.
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Sunday, July 12th, 2009 AT 12:02 AM
Tiny
DONALDLEW
  • MEMBER
  • 3 POSTS
Your suggestion of speed sensors or software goes beyond what we can do. Unfortunately, the dealers service departments have priced themselves out of the market.
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Sunday, July 12th, 2009 AT 4:53 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
An E-38 750 that has issues and wont go to the dealer because the dealer has priced themselves out of the market says something about the condition of the field of car repair, doesn't it. There are independents out there in the bay area, many could assist you.
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Wednesday, July 15th, 2009 AT 8:12 AM

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