Posted 02-22-2019 at 21:00:16 [URL] [DELETE]
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Re: Jeff’s F150
I've been driving it, but can't get rid of that tap or knock during cold acceleration. It goes away after getting up to operating temp, but I can park it for 30 min & it starts tapping again until back up to temp.
I traced the tapping to the lower right side of the block, but I've never heard of rod knock or piston slap improving with temp. The right side exhaust manifold looks to be sealed at the block....
.....but I did find evidence of a leak at the manifold flange....
I can't say I've ever experienced a manifold leak, so not sure what that would sound like. Same goes for a catalytic problem, but I'd expect performance problems with that. So, I'm still vexed.