Stinking rough idle will not go away but I think I've found the problem with the miss after heat-soak. There is a TSB for putting insulation around the #3 fuel injector.
Anyhoo..
- Fuel pressure, no run, 33psi
- Fuel pressure, run, 33 psi
- Giving it the gas I notice the pressure does fluctuate quite a bit but returns to steady with engine rpm. Might be the pump having a hard time keeping up with surges?
- Take the vac line off the fuel rail pressure regulator, run, 40psi
- Engine off after run, 30psi then.... The fuel pressure gauge creeped up from 30psi to 36psi and vaporbubbles come out the drain hose when I dumped it.... Boiling fuel. :(
Guess I could wrap the injectors with insulation and insulate the fuel rail.
Does leave me wondering if this is "normal" to have some buildup after a shutdown.
To top it off, the only place around here I could find a good fuel pressure tester with release drain was Sears.. OW. Oh well, the tester should last a good long time and it qualifies as a new toy. :)
Haven't left the gauge on and put it under boost, the hose isn't long enough to reach where it can be seen.
My thoughts are now circling around both a week pump and one or several faulty injectors, plus heat soak.
Feeling a shotgun solution coming up. :) Any suggestions on pumps or should I swallow the lump and go OEM? Otherwise it would probably be NAPA.