I have no clue what to do now. It has 8,000 miles on it. Sylinder one lost compression on my 09 5,3. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. has 92,000 miles and was just told I have cam and lifter failure. This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. There are 5.3 cylinder deactivation problems that can occur. Yes a poor design but a flaw ? Im curious as to how much tran fluid you put in? You were lucky that it worked. Took the heads off again. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. 1. I hate it. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? Are you saying that I am in the clear by a year and issues fixed? My Wifes 17 Buick with afm was my attempt to get back to gm. I wont bother with blocking the relief valve. Thank you for your time. Chevy Silverado V8 To V4 Problems - Tools Bible What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? The engine also had 799 or 243 casting heads which are closely related to the LS6. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. Another option is to plug it entirely if the AFM is already removed. Not sure what else it can be. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 I have also heard that the oil pump is to be changed and I have also heard that it does not matter. I was getting ~ 30 mpg, so I love that. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy.

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