5.3 LS cam? Lifter? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-22-2018, 05:53 PM   #1 (permalink)
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5.3 LS cam? Lifter?

2008 5.3 vortec intake valve isn't opening. I took the valve cover off to discover that the pushrod still moves up and down from cam lobe but at the top of the lobe, the push rod just barely touches the rocker. after the lobe, there is a giant gap between the pushrod and rocker. Is the cam just worn out or is there something wrong with the lifter?
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Old 02-22-2018, 05:58 PM   #2 (permalink)
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AFM. Have fun pulling the head.
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Old 02-22-2018, 06:40 PM   #3 (permalink)
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5.3 LS cam? Lifter?

FIL had a similar thing happen in that year model of Chevy. Ended up replacing all of the lifters.


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Old 02-22-2018, 06:44 PM   #4 (permalink)
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Sounds like a stuck valve to me, try tapping it and see if it pops back up.

Don't be afraid to get help
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Old 02-22-2018, 07:10 PM   #5 (permalink)
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Sounds like a stuck valve to me, try tapping it and see if it pops back up.

Don't be afraid to get help
the valve is fine, the pushrod has more than a 1/4" of gap between the rocker and pushrod.
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Old 02-22-2018, 07:11 PM   #6 (permalink)
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AFM. Have fun pulling the head.
AFM?
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Old 02-22-2018, 07:15 PM   #7 (permalink)
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did the pushrod plow into the lifter or something? or is it the cam lobe worn down 1/4"? the pushrods are fine, the valves are fine...
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Old 02-22-2018, 07:53 PM   #8 (permalink)
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Most likely cause of failure

Start searching LS1tech.com and other sites about replacing the DOD/AFM (Drive On Demand/Active Fuel Management) lifters. They are a known failure point and costly to fix if paying a shop. You have to pull the heads and replace the gaskets in the process. BTR, TickSpeed, Skoggin Dicky, etc... all sell DOD delete kits that include new lifter trays, gaskets, new regular lifters similar to the non DOD lifters, head bolts/studs and possibly a different cam depending on the kit and price.

I picked up a 2013 5.3l complete with a failed lifter for $400 because a shop quoted the guy $3000 in parts and labor to replace the lifter. He found a low mileage 6.2l engine takeout and a different mechanic that swapped it out for the same price as the repairs on his 5.3L.
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Old 02-22-2018, 08:00 PM   #9 (permalink)
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Your DOD lifters essentially fill with oil to engage the rockers under certain conditions and actuate the valve. When the computer wants to see better fuel economy during cruising and sustained rpm it deflates the lifter by shutting off the oil supply and the cylinder basically shuts down.

DOD/AFM delete kits remove all the DOD lifters, replace them with new solid lifters similar the same as the non-DOD lifters. The kits also supply a new valley cover without all of the solenoids for the DOD and just have o-rings that seal the DOD oil supply towers. Most people going for performance and extra insurance will tap and plug the DOD oil towers as well. Lingenfelter even sells a special aluminum solid blind rivet and tool to speed the process.
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Old 02-22-2018, 09:13 PM   #10 (permalink)
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Originally Posted by Toysupra1 View Post
Your DOD lifters essentially fill with oil to engage the rockers under certain conditions and actuate the valve. When the computer wants to see better fuel economy during cruising and sustained rpm it deflates the lifter by shutting off the oil supply and the cylinder basically shuts down.

DOD/AFM delete kits remove all the DOD lifters, replace them with new solid lifters similar the same as the non-DOD lifters. The kits also supply a new valley cover without all of the solenoids for the DOD and just have o-rings that seal the DOD oil supply towers. Most people going for performance and extra insurance will tap and plug the DOD oil towers as well. Lingenfelter even sells a special aluminum solid blind rivet and tool to speed the process.
wow.. its not even my truck lmao. yeah i dont think ill ever buy an afm motor for sure. he's just trying to flip it so we will probably just replace it with a stock lifter. thanks
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Old 02-26-2018, 10:07 AM   #11 (permalink)
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It was the lifter.. It was colapsed. $50 later at the parts store and i got a new one, in the process of slaping it back together. Thanks.
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