El Tigre
I'm Awesome
Maybe an Admin, or moderator will take mercy on this thread, and delete it.
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I'll second that and add that if the metal shell were to come loose from the valve guide it would make noise all the time,not just at start up. This is a common problem on shovelheads where monkey's beat them down over the guide crooked and they come loose pretty quickly.I'm unable to envision how VSS could affect a tap/tapping.
However, if the VSS is a metal-clad type, And ALL its polymer is essentially stripped away... And If what remains of VSS is little more than a thin-wall steel shell... then I can imagine that "shell" bouncing around might make a tapping sound. I've seen lotsa metal-clad VSS; some of those were worn-out. But I've never seen one stripped of all rubber etc.
Worn valve guides might be,. Worn valve stem seals are often the culprit behind the puff of blue smoke on vehicle startup, and accelerated oil consumption.can bad valve stem seals also be a cause of the few tap startup deal?
Same experience with our '06 Yukon XL Denali, 6.0.The only experience I've had with them is my sis-in-law has a n 05 Yukon Denali with a 6.0 Runs like a r@ped ape but the fuel economy sucks especially if you hook anything up to it. My brother has a 04 Avalanche with a 5.3 that won't pull itself out of a wet paper bag,my worn out 305 will run circles around it. Both trucks are in a good state of tune just useless as teets on a boar hog.
Not in my experience; quite the contrary. In those motors (rpo L31), I've found startup valve clatter the culprit; although it's often mistakenly ID'd as "piston slap."Many if not most of the 5.7 Vortec motors experience some "piston slap" on start-up.
I'm through a WiX xp and a Mobil one...and still get random tap at startup....in the end, the valve clatter on startup is primarily due to oil filter having drained back to pan; no coincidence that's core premise of this thread.
Have you tried going back to 10W-30 ? If so, what were results ?I'm through a WiX xp and a Mobil one...and still get random tap at startup....
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Wish I knew what was going on. Never did this until I changed my intake gaskets, switched to 5W30 synthetic from 10W30 conventional for the past 10 years , or adjusted my valve preload...and , I was running stp regular or extended life with silicon anti drain back oil filters forever...apparently both stp have anti drain back...
But, after the switch to 5w30 synthetic is when it all started if I had to guess....
Yes but not conventional. No differenceHave you tried going back to 10W-30
Many...Over 100k if guessing...Idk about abuseHow many miles on lifters ? Have they ever suffered abuse ?
Yes... I had a thread discussing it. They all looked good ... I cleaned them well. They all pumped up tight...cam lobes seemed ok afaik....even cleaned my oil filter adapter recently...Have you disassembled each one individually and cleaned them with solvent ?