Doosan GC20E-5 MU-00129 - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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Doosan GC20E-5 MU-00129

Hi all..Having a problem with this truck..It runs fine for 30-45 minutes then the engine starts to stumble and gradually starts backfiring but keeps running.If the truck is shut off when its in backfire mode it wont restart till it sits for awhile.Its throwing a 771 code which I was told is a bad 02 sensor... I changed the 02 sensor but it still does the same thing..The LP Reg and Mixer/Electric throttle body have been changed not long ago..Any help would be much appreciated...Thanks

Posted 15 Mar 2014 08:30
By Fork1t
joined 12 Aug'13 - 7 messages
South Carolina, United States

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almost anytime I see an O2 sensor code, I start my troubleshooting with a full, complete tune up.
An O2 code means either the engine is running lean or rich for too long, not that the O2 sensor has failed.
Do a tune up, including spark plug wires, rotor and distributor cap, and be sure to gap the plugs. Gap on spark plugs in an LPG engine is far more 'critical' than on older flat head motors running on Gasoline.
also be sure to drain the LPG regulator "honey" with the engine hot and fuel turned off and ran out.

Posted 15 Mar 2014 22:13
By edward_t
joined 5 Mar'08 - 2,334 messages
South Carolina, United States

"it's not rocket surgery"

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