This gasoline K25 engine will not accelerate when put into forward or reverse (no visible codes). The truck revs in neutral, or using hydraulic functions in neutral. The oil light is on and sometimes goes out, but oil level is good, but dirty. Truck temp. is mid-range. The operator said, the truck needs to idle for about an hour, then it will accelerate in gear; if shut down, only for a minute, it will not rev in gear again.
Perhaps a bad oil sender is throwing the truck into a "slow mode?" Maybe old oil has thined out, not allowing the sender to read pressure well enough? Perhaps the oil pump is faulty? Could be everything, or has nothing to do w/oil.
Any suggestions?
Showing items 21 - 25 of 25 results.
You say it revs up fine in neutral and revs up fine when you put hydraulic load against it right?
Try pulling the flex plate bolts, back the converter away from the flywheel it's just a few bolts, start it up put it in gear and see if it revs up.
This will eliminate anything mechanical really quick. A bad converter will bog an engine down in gear. If it doesnt change you've only spent a few minutes and then you can concentrate your diagnostics to possible "electrical" or other issues as you first thought. If deadheading the hydraulics in neutral doesnt bog the engine down it sound like you could eliminate fuel issues too. Most oil pressure safety systems will shut the engine down shortly after not sensing proper oil perssure so I dont think thats it either.
Its straight gasoline. As soon as the machine is put into gear, the machine goes into idle mode.
I have had this issue in the last couple weeks with the same problem,this truck has the Nissan engine in it,change out the Injector and the LP Pressure sensor right next to it also check the small screen on the vapor inlet tube to make sure its not plugged,sounds like your injector isnt working properly...
Torque converter? The engine will not move beyond an idle when put into speed. If the acc. is depressed while in gear, the engine does nothing more than idle.
Sounds like a bad torque converter, check the pressures. I have seen it quite a few times. Probably feels very "boggy" when you hit the accelerator in gear.
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