In Reply to: F150 clatter/new wrinkle posted by lonestarjeff on December 05, 2018 at 22:53:25:
The leak from your tailpipe is a natural byproduct of the combustion process of the internal combustion engine. It's called water. Water generally turns to steam and you never see it as it exits your tail pipe with a heated engine. If you look at the bottom rear of your muffler, you might see a small hole, about 1/8 inch, in the bottom of it. That is also to allow water to drain and prolongs muffler life.
With a cold engine, seeing water dripping out the tail pipe is not out of the norm and at certain ambient temperatures is more evident.
As for your 'spark knock' engine noise, as I posted the link, chances are your timing chain components are going away. I just retired as a fleet mechanic and we had a few 4.0 Fords with the same engine noise problems. Thinking of how many in the local fleet? My bad memory recalls about 100 of them. 150 at the most, I believe.
The problem with those being that Ford said that 8 PSI oil pressure at idle is an acceptable number. Perhaps a bit low for a new engine, than add a few thousand miles and I don't believe the engine will maintain the 8 PSI pressure standard.
Your 5.4 rattle might be different, but then again...?