August 15, 2021 at 6:33 am #667739
Good morning all,
My 2010 Chevy Suburban with the 5.3L Vortec engine has Active Fuel Management or Displacement on Demand or Cylinder Deactivation between 4 and 8 cylinders.
I was on the highway when I heard a knocking or clicking noise in the engine. I went to the shop and they said probably the lifter. I took of the valve case and found 1 loose rocker head in cylinder 1. There were no error codes or misfires. The engine was running smooth just had the tick.
The push rods and rocker heads seemed fine. When I took out the lifter of the associated loose rocker head, the lifter did not have any visible damage and it was not collapsed or stuck.
This makes me think it is an oil pressure issue and I am wondering what is the best solution.
Should I replace the lifter even though it looks fine? Should I use one of the computers to disable the AFM system? Where can I get a new FLOM (is it possible this part has a build up of some sort and is reducing pressure to cylinder 1?). I am not a mechanic so I am looking for any help or experience with how to best resolve the ticking issue in the engine and disable the AFM to reduce the likelihood of the issue coming back.
Thanks in advance! I appreciate any help and guidance.
August 16, 2021 at 6:17 pm #667946
I had a lifter stuck collapsed on my 2013 5.3 Gmc sierra. Went on Youtube and watched Crazed performance repair. I did exactly like him, removed the flom, blocked the oil supply to the solenoids and send my computer for reprogramming. My lifter was stuck closed so I had to unlock it with his method. The engine running like new and stopped burning oil. Good luck
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