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2013 Yukon XL Denali Stuck Lifter & One Clean Cylinder
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Question
JohnsonSteven
Hi all. New to the forum. I joined because of the wealth of information pertaining to the stuck AFM lifter issue on the L94 6.2l.
While idling through a parking lot Friday, my engine started ticking, and quickly became a loud banging. I made it home (approx. 8mi) with good oil pressure and normal coolant temp. Upon disassembly, found the #4 exhaust lifter (AFM) stuck. Cam looks beautiful still. Vlom filter has been replaced within the last 6 months.
I have new lifters (all 16), GM lifter guides, valve lifter oil manifold, gaskets and bolts on the way.
My question here is about the oddly clean #4 cylinder. See pic. All other pistons/cylinders have some carbon build up. But the cylinder with the bad lifter is super shiny and clean. Does anybody have any thoughts on why this would be?
For what it's worth, most of the valve lifter oil manifold bolts were barely finger tight. No obd2 codes. The car seemed to drive properly before the lifter issue, with an occasional minor hesitation when first accelerating from a stop. No oil consumption..
Any help would be greatly appreciated.
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