Tapping before and after DOD delete.........
03-27-2017, 08:00 PM
#1
Tapping before and after DOD delete......... Chasing my tail here. Just fired up a 2008 Silverado with a 5.3 after we did the DOD delete kit. New oil pump. New oil pan. New rear main. Front main. Lifters of course. Non DOD valley cover.
Still tapping like it has a collapsed lifter and I don't have an immediate answer. 40 psi oil pressure constant.
Any ideas?
Still tapping like it has a collapsed lifter and I don't have an immediate answer. 40 psi oil pressure constant.
Any ideas?
03-27-2017, 08:48 PM
#2
Could you confirm that it was a lifter issue before or after tear down? Does it sound cam speed or crank speed?
EDIT: if everything valvetrain related was replaced, I'd bet it's "piston slap".
EDIT: if everything valvetrain related was replaced, I'd bet it's "piston slap".
03-27-2017, 08:51 PM
#3
Had the typical collapsed lifter issue that DOD and non DOD cars have. We checked cam and old lifter rollers to ensure the old cam was not damaged like some I have seen from a roller failure.
My buddy Chad said he corvette he just put together last week did the same **** with a new engine till the tuner beat the **** out of it getting the tune done. We couldn't drive it since the AFM is freking out. We will have it tuned tomorrow and find out before we take it back apart.
My buddy Chad said he corvette he just put together last week did the same **** with a new engine till the tuner beat the **** out of it getting the tune done. We couldn't drive it since the AFM is freking out. We will have it tuned tomorrow and find out before we take it back apart.
03-29-2017, 06:57 AM
#6
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What lifters and what dod delete kit?
I just had the similar issue with a customers 08 silverado. Did the AFM delete with the Texas Speed kit and a cam swap to their stage 3 low lift cam, after start up it had a lifter noise like it wasn't pumping up. I let it run for a minute killed it pulled the valve covers found the top of two rocker arms still dry, reassembled the valve cover started it back up let it run for another 2 minutes and the lifters finally pumped up. Took a total of around 4 mins for two of the lifters to pump up, which is the longest I have ever seen. They where ac delco ls7 lifters.
I just had the similar issue with a customers 08 silverado. Did the AFM delete with the Texas Speed kit and a cam swap to their stage 3 low lift cam, after start up it had a lifter noise like it wasn't pumping up. I let it run for a minute killed it pulled the valve covers found the top of two rocker arms still dry, reassembled the valve cover started it back up let it run for another 2 minutes and the lifters finally pumped up. Took a total of around 4 mins for two of the lifters to pump up, which is the longest I have ever seen. They where ac delco ls7 lifters.
