mickbear
georgia
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Joined: 07/26/2005
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i have a 2004 MicroQuiet 4000 with about 43 hrs and its began surging, it starts ok but surges. i can spray carb clearner in the carb and the surgung stops for 30 seconds or so .any ideas what might be causing this?
thanks
mick
2005 TIOGA 23E
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tvman44
Southwest Louisiana
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Dirty carb.
Papa Bob
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dougrainer
Carrolton
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43 hours in more than 4 years= NOT running the APU enough and the fuel has varnished in the carb and clogged the jets. Onan Service centers only replace the carb, they have no rebuild kits. But, you can rebuild them by taking them apart and cleaning the jet orifices. The gaskets/Orings rarely are destroyed when you take the carb apart. Doug
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PaulJ2
Northwest Oregon
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Joined: 12/23/2005
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Surging means running too lean. As other have said, dirt or varnish in the carburator jets. Adjust the main mixture screw if it has one. Many now days don't.
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TEXAS
Centerville Tx
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Joined: 08/17/2003
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Try running some carb cleaner in the gas. I have had good luck with that. After you get it running ok. Run it at least once a month. To keep the fuel system clean.
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smithlkd
Alabama
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Joined: 12/27/2007
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Mickbear,
Clean carb with seafoam then change the oil. Sometimes you can have the proper level of oil and the low oil sensor will give false signals at the control board and cause a surge condition even with a new carb and proper tuning. Old oil will foam and carb cleaners will thin oil before you know it. Always change genset oil every 50 hours or every three months during the run season. Winterize with with fresh oil and run for one hour at half load every month.
Lynn Smith
1984 Allegro P30 chassis
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gunny357
North Carolina
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smithlkd wrote:Mickbear,
Clean carb with seafoam then change the oil. Sometimes you can have the proper level of oil and the low oil sensor will give false signals at the control board and cause a surge condition even with a new carb and proper tuning.
Where'd you come up with this information?
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Camper Ken
Oregon
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Joined: 06/02/2007
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I also have the Onan 400 generator. On our last trip the generator would surge a little but only when running the AC. We were at about 5,000 feet altitude and I did set the altitude adjustment on the generator. Never had the surging problem before. It's about a year old with 30 hours. I run it at least once a month for an hour or two under 1/2 load to exercise it.
Any thoughts on this? Thanks...
2007 Winnebago Access 31c
(2006 Ford E450 chassis)
2007 Winnebago Access 31c
2006 Ford E450 chassis
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mickbear
georgia
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two things i found out and maybe will help someone in the future.1St run the gen every month ,2ND check the altitude adjustment on the generator,some how the adjustment knob had gotten moved all the way over to the highest setting,i live in ga so i moved it back to the lowest setting, i filled the main tank and added carb cleaner and kept cranking the gen and running it and spraying carb cleaner in the carb area after a while the surgging stoped.thanks for all the help
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