Fix for a Backfiring Mercedes Benz
This bulletin applies to 2016 Mercedes-Benz CLS400 vehicles equipped with a 3.0L engine. A popping noise/intake backfire may be heard from the engine on a cold start.
Mixture adaptation has been set to an extremely lean condition in the cold start situation before O2 sensors and analysis reach operating temperature. Update the engine control module program with DVD 03/16 and add-on 5413 and add-on 5685.
About the Author
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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.