2009 GMC Sierra 5.3 LS AFM is garbage and a terrible design
I have an ‘09 GMC Sierra 1500 SLT with 154k. Always changed oil and filter every 4K miles, used Motul 5w-30 and Wix Gold filters. Engine upon tear down was spotless, no sludge or carbon anywhere. The thing always used oil and it was too much of a pain in the as to go through the oil consumption tests, so I alway just changed the oil every 4K instead of the recommended 6k. I’ve had to clean out the oil pressure sensor filter about once every 6-7 months and a couple weeks ago, I was driving the truck and the dash lit up like a Christmas tree. Pulled over and had a dead miss, scanned it and engine misfire on #4. Well, ****.
Towed the truck home, coil pack and plug test we’re fine. Did a compression test and #4 had 0 psi, pulled the valve cover and #4 intake lifter was collapsed. Bought an extended warranty when I got the truck and luckily I kept all of my receipts for maintenance and kept a log. ( I always do my own maintenance)
Had it towed to the dealer and after tear down, lifter was collapsed and had rotated in the lifter tray and wiped out a cam lobe. Getting a new GM replacement engine installed by the dealer and will be purchasing a AFM delete chip.
AFM and LS lifter design is garbage.
1987 corvette LeMons race car.
1968 Malibu, ZZ4, M-21 4 speed, 9" ford 3.73:1 Detroit truetrac posi
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