Posted by 4play on September 23, 2021 at 21:14:02 from (158.62.135.243):
In Reply to: New Chevy question posted by rrman61 on September 20, 2021 at 10:02:58:
All LS based engines had lifter problems, even some valve and valve spring problems too, there was just a lot more in the AFM years due to a more parts, complex design, and probably cheaper sourced parts. For trucks AFM started in 2007, and was only on the 5.3L, later it came out on the 4.3L V6, and 1500 6.2L, but never on the 4.8L or 6.0L, so don't worry about 3/4 or heavier trucks having AFM.
The newest edition of AFM is called Dynamic Fuel Management or DFM. This came out on the 2019 to current engines. This system is similar to AFM but instead of cutting off the same 4 cylinders simultaneously, it has several different modes. It can kill 2 cylinders, 4 cylinders or any of all 8 cylinders depending on certain loads or conditions. The newest design has brought even more types of valvetrain failures (lifters, valves, cam, and pushrods)
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