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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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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