Engine Controls - Multiple Driveability Conditions
SI B 24 05 08Automatic Transmission
August 2008
Technical Service
Similar information may be found in SI B12 15 08 dated August 2008.
SUBJECT
E65, E66 with N62TU - Various Driveability Complaints
MODEL
E65, E66 (750i, 750iL) produced from 03/05 up to 09/07
SITUATION
The customer complains about one or a combination of the following situations, listed below:
1. The engine has a rough idle, or the idle fluctuates on the initial cold start when the outside temperature exceeds 59F.
2. Creep speed bucking.
3. Drivetrain "clunks jerks" when reaccelerating at low speed ("load reversal").
4. The vehicle jerks when accelerating from a stop ("throttle calibration too aggressive"), or the vehicle does not accelerate smoothly from a stop ("brief delay and then lurches forward").
5. Shudder and/or noise and/or surge and/or hesitation from the transmission during a cold start operation.
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