Doosan (& Daewoo) GC25P-5:
Misfire after running good for 10+ minutes

Model: GC25P-5
Engine: GM G424FE
LP

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

Spark plugs
Wires
O2 sensor
Propane regulators
Inner Air Filter that was destroyed along with the outer filter.
Fuel leaks after the regulator replacement
Air intake
  • Posted 16 Mar 2023 10:09
  • Discussion started by Brian_Freeland
  • Missouri, United States
Brian Freeland
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.
  • Posted 19 Mar 2023 06:49
  • Reply by Brian_Freeland
  • Missouri, United States
Brian Freeland
any updates?
  • Posted 19 Mar 2023 06:17
  • Reply by andrew_k
  • England, United Kingdom
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!
  • Posted 17 Mar 2023 12:06
  • Reply by Brian_Freeland
  • Missouri, United States
Brian Freeland
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?
  • Posted 17 Mar 2023 12:03
  • Reply by Brian_Freeland
  • Missouri, United States
Brian Freeland
Brian,

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
  • Posted 17 Mar 2023 11:09
  • Reply by garland_m
  • Virginia, United States
Work Hard and Fish Long
leaky injector, hydra locking?
  • Posted 17 Mar 2023 11:08
  • Reply by Krusty
  • Ontario, Canada
krusty
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.
  • Posted 17 Mar 2023 09:13
  • Reply by Brian_Freeland
  • Missouri, United States
Brian Freeland
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.
  • Posted 17 Mar 2023 03:25
  • Reply by andrew_k
  • England, United Kingdom

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