Engine - Various Driveability Complaints and MIL ON
SI B12 02 12Engine Electrical Systems
February 2012
Technical Service
SUBJECT
N54 and N73 Engines: Various Drivability Complaints and Service Engine Soon Lamp Illuminated
MODEL
E82 and E88 (1 Series) with N54 and N54T engines
E90, E92 and E93 (3 Series) with N54 and N54T engines
E60 and E61 (5 Series) with N54 engine
E71 (X6) with N54 engine
E89 (Z4) with N54 and N54T engines
F01 and F02 (7 Series) with N54 engine
E65 and E66 (7 Series) with N73 engine
INFORMATION
Various drivability complaints and/or misfire faults may be attributed to the formation of intake valve/port carbon deposits, however many other items can cause these symptoms
PROCEDURE
Before attempting any repair to clean the carbon buildup on the intake valves/ports, a complete diagnosis encompassing the vehicle, coils, and injectors have to be performed. Refer to the applicable Service Information Bulletins before removing any components from the engine.
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Only after a complete diagnosis has been performed without any faults being found, submit a PuMA case with a thorough explanation of the complaint, diagnostic steps taken, and fault codes observed. Include in the title "Intake Carbon".
After TSE review, the appropriate repair solution will be provided by the TSE via a return response to your PuMA case.
WARRANTY INFORMATION
Eligible PuMA approved repairs are covered under the terms of the BMW New Vehicle/SAV Limited Warranty or the BMW Certified Pre-Owned Program.
Claims for repairs to de-carbon the intakes valves/ports without prior TSE PuMA case approval will not be accepted.
TSEs will provide reimbursement information in the PuMA Case.