Chevrolet Says Vehicle May Have Wrong Cam

Sept. 22, 2020

 

This bulletin applies to 2010-2015 Chevy Camaro and 2015-2016 Colorado equipped with a 3.6L engine, 2007-2017 Equinox equipped with a 3.0 or 3.6L engine, 2007-2012 Malibu equipped with a 3.6L engine and 2009-2019 Traverse equipped with a 3.6L engine. 

This bulletin applies to 2010-2015 Chevy Camaro and 2015-2016 Colorado equipped with a 3.6L engine, 2007-2017 Equinox equipped with a 3.0 or 3.6L engine, 2007-2012 Malibu equipped with a 3.6L engine and 2009-2019 Traverse equipped with a 3.6L engine. 

Some dealers may experience a misfire immediately after installing a GM remanufactured HFV6 engine, usually limited to 1 bank or 1 cylinder. This is usually a rear cylinder (5 or 6) but could be any cylinder. The condition could be caused by the wrong camshaft being installed in the engine at the reman facility.

If you experience this concern, inspect the camshafts to ensure the correct camshaft is installed in each intake and exhaust position by comparing the ring strategy to either the engine that was removed (the best approach) or by the charts available in the service manual. 

Ring strategy camshaft identification is a series of rings along the camshaft that are either castings or castings that have been machined. There are five rings on each camshaft. 

Identification occurs by the order in which the machined or cast rings are on the camshaft. If you find one or both incorrect camshafts, replace with camshafts taken from the original engine (if not damaged) or with a new camshaft.

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.

About the Author

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.

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