Engine Controls - Bucking When Engine is Cold
SI B 12 46 06Engine Electrical Systems
November 2006
Technical Service
SUBJECT
N54 - Slight Bucking is Felt During Acceleration With a Cold Engine
MODEL
E90 and E92 with the N54 engine produced from 6/1/2006 through 9/15/2006
SITUATION
The customer complains that the vehicle bucks slightly under acceleration or when pulling away after a cold start. This situation may occur ONLY on a cold engine, and is primarily noticeable in gears 1 - 3, up to an engine speed of 3000 RPM. Both manual and automatic transmission equipped vehicles may be affected.
CAUSE
DME software calibration.
CORRECTION
On a customer complaint basis only, reprogram the vehicle using Progman V23.01.00 (Target data status: E89x-06-09-530) or higher.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Defect Code Refer to KSD
Labor Operation: Refer to KSD
Labor Allowance: Refer to KSD
Disclaimer