Quote:
Originally Posted by MD540iT
Well, FWIW, it seems to run better with the "open" WUR and not being effected by heat soak.
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there is very little heat on the top of the 930 engine.
set the WUR to spec and find the REAL problem.
i spent probably 2 yrs, maybe more (off and on) trying to fix a very lean cruise condition.
i did a LOT of experimenting and testing with fuel pressure AND control pressure.
in the end i had a bad FD (cast iron) even after being rebuilt twice.
set it back to spec
make sure all the CP are correct. even under boost.
buy a hand vac that can also pressurize and check the WUR CP for boost.
make sure NO air leaks on the pressure side.
for me, even venting my BOV to atmosphere had an effect on AFR.
make sure system pressures are steady and good.
check fuel flow per spec to WUR and out of FD.