Engine: GM G424FE
Our Fork lift runs good for ten minutes or so. It then backfires and has trouble starting after it backfires unless you let it set for twenty or so minutes. If it happens to start after a backfire it usually backfires several times before actually running again. Once you get it running after the backfire the acceleration is really low and it moves very slowly. Eventually, the acceleration will pick up and be back to normal but when you go to park it, it usually backfires once you put it in neutral or remove your foot from the gas pedal. Using the clutch and the gas pedal and keeping your rpm's up usually helps keep it running. Once it sets for an hour or so it usually runs smoothly again until you use it for 10+ minutes. It runs great until it doesn't.
Fixed or Replaced
Inner Air Filter that was destroyed along with the outer filter.
Fuel leaks after the regulator replacement
Showing items 1 - 8 of 8 results.
I removed the PCV valve but continued to backfire while operating. I then inspected the valve and from the research I did. It was working fine and moving freely. I cleaned it up with some brake cleaner and re-installed. Worth a shot. I appreciate the reply.
Thanks! I will have to research that. I'm familiar with compression tests but have never attempted. I learn as I go though. Any extra advice on what I would need to do these two tests would be great. Thanks for the tips!
It's an LP only not the duel fuel. I'm not an expert but I'm assuming the injectors are only on the duel or gasoline and regulators for the propane?
Should the PCV valve not fix the problem, complete a compression test when cold and hot. May need to also do a leak down test. Good Luck
leaky injector, hydra locking?
Thank you! I will definitely try that. I'm not to familiar with that valve but I have located it in my manual. Looks pretty simple. Thanks again!
Still open to more suggestions. I will try Andrew's suggestion tomorrow and see if it cures my back-firing issue. I truly hope it fixes it. I'm ready to stop playing with this piece of equipment. It is my favorite fork lift so, I owe it my attention.
Check the PCV valve, I had one that always backfired on startup. Removed the pcv valve altogether and cap the inlet manifold and the truck was fixed. Think it causes a weak mixture.
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