GM’S Active Fuel Management: Camshaft and Valve Lifter Failures

GM’s Active Fuel Management (AFM) system allows a V8 engine to turn off half of its cylinders for fuel economy purposes. In doing so the V8 engines RPO: L76, L77, L83, L86, L94, L99, LC9, LFA, LH6, LMG, LS4, LT1, LT4, LY5 and LV3 are developing a history of camshafts and valve lifters being turned into scrap metal. The symptoms of a cam or lifter failure usually involve a chirping, ticking, squealing or squeaking sound accompanied by a Check Engine light and engine misfire codes stored in memory. The misfire condition may not be evident to the vehicle operator… 

2 responses to “GM’S Active Fuel Management: Camshaft and Valve Lifter Failures”

1. Sean Mcgowen says:

   September 10, 2021 at 9:58 pm

   Is there a recall on this problem and if not why

2. johnnie chandler says:

   September 29, 2021 at 11:19 am

   is gm doing anything to fix this problem.

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