Hey all! Long time lurker first time poster. My greaseride is a 1991 Delica l300. Been running excellent on VWO for 50 thousand km so far. Always use the cleanest oil, and filter to 1 micron. Suddenly overnight I developed a lack of power. Still idles fine, just won't rev out (on veg or diesel). When i start it up it revs out to about 2k, but then drops to 1k. Not much smoke or anything, no other notable symptoms. Turbo still spins fine, good fuel supply to IP, brand new fuel filter, Have cleaned filter screen at the outflow of the IP at junction with return line -does not seem to be one at the inflow. Pump does not leak, have verified that the shutoff solenoid is working, have checked that the boost pin or governor pin is not stuck, and have run ATF through the pump.
Has anybody else had this kind of problem?
I'm posting here, because i'm wondering if others using WVO are having injector pump problems? By the way it's been running great. Not slowly wearing out. I have not been adjusting the idle to compensate for a wearing out pump. Any suggestions as to what could be going on?
I will be checking the exhaust for blockage, running some weird injector cleaner gunk through it, and blowing compressed air backwards through the pump.
Looking for any more ideas before I have to pull the pump off (which means timing belt on the delica)
BTW the throttle linkage is good as well... seems to have some effect as it won't run well without pedal to the floor.
Could something in the governor linkage be gummed? Or is a spring broken? Or is there a tiny passageway like the one inside the fuel return line banjo bolt that is blocked? That's what it feels like. Like fuel is restriced somewhere. Only fuel flow is verified good up until the pump.
Thanks guys! Hope this discussion contributes well to community knowledge!