Yeah, 1 and 2 I will do tomorrow. I have triple checked vaccuum line routing, and all vacuum lines are brand new. I did notice if I unplug the vacuum line going into the fuel pressure regulator it idles up a little, but doesn't run any better. I do have another regulator I can swap in, but I'll start by checking fuel pressure first. The spare regulator is from the old engine, and same regulator that was on the truck last year with this same symptom, so I don't see that necessarily being it.my list for you Chris is as follows:
1. fuel pressure check
3. then give up on being diagnostic and start swapping parts from DD one part at a time!
Shit is aggravating as hell, sorry man. That 1100RPM max is really suspect....does it just lean out and die above that throttle opening? Engine is not getting enough fuel for the amount of air. big vacuum leaks (try spraying carb cleaner around everything, plug brake booster hose, triple check vacuum hose routing, etc.) Or maybe still an AFM problem..... or ......
the engine has miles on it, he got to hear it run before he bought it. problem is definitely a gremlin with his truck/components. Truck has *always cranked a long time before firing and the old engine shut-off during KOH 16. something deeper seated is wrong with system(s) in the truck.have u contacted the builder of that engine?
Que Twilight Zone music...the engine has miles on it, he got to hear it run before he bought it. problem is definitely a gremlin with his truck/components. Truck has *always cranked a long time before firing and the old engine shut-off during KOH 16. something deeper seated is wrong with system(s) in the truck.
They didn't have any Denso O2 sensors when I went to get one, but I got a Bosch and swapped that in - didn't change anything? Probably will go ahead and order a Denso and keep the Bosch as a spare. When the engine is running, there is no difference at all if I unplug the O2 sensor...it sounds like the exact thing my truck was doing and it ended up being the O2 sensor on the exhaust manifold. Couldn't remember if you change that. Hopefully it helped!