The oil doesn't smell and I've done two oil changes (with the larger oil filter) as well as dropped the pan and cleaned it out. I haven't lost a drop of coolant (I marked a line) in over six months.

I lost my compression tester in the move so I'll grab one of those next and see what's what.

I did just drop from 29 to 25 over a couple hours of having the fuel pressure gauge connected but there was no immediate drop off (indicating a bad injector).

I may order a new FPR as well as a fuel pump just because I don't know if they were replaced when the engine build was done.

Bottom end is original - 172k miles.

 

The oil would more than likely smell like fuel with a leaking injector and sometimes you get a misfire code for that cylinder. Not a bad idea to replace or have them ultrasonic'd in the future though. Mine had inlet screens which trapped the fuel line/rail rust. That could cause a lean condition as could the fuel pumps pickup screen. The sediment in mine had it nearly occluded and it was hard as a rock. The intake manifold bolts are a good cause for intake leaks, barely cinched down per spec. Must use a thread locker to keep them from loosening up.

 

MAF sits around 0.09 or 0.011 (something like that) and rises with acceleration but does not fluctuate at idle.

 

Replaced the fuel pump and still at only 30 psi - shouldn't it be up around 36?

 

32-34 would be normal. Have you replaced or at least checked fuel filter on passenger side frame rail?

 

It was replaced April, 2014...what's the replacement cycle on these things?