This bulletin applies to BMW vehicles equipped with a turbocharged engine. The proper part numbers for the vacuum hose must be used when replacing the vacuum supply hoses of as turbocharging waste gate control system.
Inside diameters are not all the same. For example, a vacuum hose that is used for the waste gate control is not the same inside diameter as the one used for the exhaust flap control. Interchanging these hoses will result in repeat repairs. Mixing hose diameters may lead to the warning light on with various boost faults stored in the DME, whistling or buzzing by the waste gate control system or uneven acceleration under full load (shuddering/bucking).
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.