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Old 11-24-2011, 12:07 AM
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Petr51488 Petr51488 is offline
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Honda Gx390 Shutting down!

I've been reading into this problem and i see that it might be the low oil sensor and such. I did unplug the yellow wire and it still does the same thing. It starts. It runs for a little but when i start pushing the blower around, it shuts off. I keep starting it, it runs, and eventually it runs, but at that point i want to throw it off a cliff. I have no idea what it could be. The sensor is unplugged (the single yellow wire) but it still gives me problems. I ran carb cleaner through it for a while thinking it was something along those lines and it worked for the remainder of the day that i needed it (20 min) THe spark plug is new. Fuel is clean. Its been doing this pretty much all season. Any ideas??
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Old 11-24-2011, 08:23 AM
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dutch1 dutch1 is online now
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Running carb cleaner through a dirty carb will not necessarily remove the debris that may be partially blocking the main jet and emulsion tube.. Remove the carb. Clean the carb bowl, main jet and fuel nozzle/emulsion tube. You could have debris floating around in the bowl that is being picked up when the engine is running, then drops off when the engine is shut down. With the carb bowl removed, the main jet can be removed. The fuel nozzle/emulsion tube may fall out with the main jet or may have to be pushed out of the barrel of the carb from the venturi. Reach past the choke butterfly with a small flat screw driver to push it down. Even then it may need some persuasion.

Here's a link to a typical carb on a 390.

http://www.upstateoutdoorpowerequipm...ZF60ZF60E1400A
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Old 11-24-2011, 09:12 AM
djagusch djagusch is online now
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Besides cleaning the carb, replace the in tank filter, air filter, and gas line. I would guess all those parts would be under $25 and you are touching them all when taken off the carb. Clean the carb really well, take it all apart if you can, otherwise take it to the dealer (carb only) and ask them to clean it up.
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  #4  
Old 11-24-2011, 09:52 AM
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MowerMedic77 MowerMedic77 is offline
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Have seen some of the newer large chrome emissions gas caps not venting try running loose and see if your issue continues...
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Old 11-26-2011, 02:48 PM
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Petr51488 Petr51488 is offline
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Thanks for the advice. Just a few things to note. The engine runs fine for the most part when its standing still running full speed. But what good is a push blower when its standing still? It starts when its being pushed around. For some reason after i used a lot of carb cleaner ( and i understand about there still being stuff inside) it ran fine for the rest of the day (30 min or so left over). I ran it for 3 hours on one job and it only shut off once or twice and started back up, unlike the other times where it was constant pulling and using half choke etc. Another thing to keep in mind is that this, or any of my equipment does not get neglected. All fuel falves are shut off, stabil is used when putting away etc etc. I know problems can still occur when doing all that but just know that its not being put away in a sloppy manner then wonder why its not working when its suppose to. I've had nothing but great things to say about the 10+ honda engines that i own but this one is giving me some trouble and im sure its something stupid. I'll try what was suggested and will let you know.

and i have heard of the venting issue. I'll take a cap off a different machine and replace it and see how that works. These larger honda's do have a different cap.
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  #6  
Old 12-04-2011, 01:23 AM
EquipmentCity EquipmentCity is offline
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We replace several GX340 & GX 390 carbs, we order them from stens. For only $35 we just replace them instead of cleaning them. We have also had intermittent spark from a weak coil. You can do a simple OHM test to check the coil. Hope this helps.
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  #7  
Old 12-04-2011, 01:58 AM
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NEW CITY LAWN CARE LLC NEW CITY LAWN CARE LLC is offline
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Yeah I was just going to suggest a simple thing to try and take the gas cap off or loose and barely on
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  #8  
Old 12-04-2011, 10:22 AM
DEPENDABLE LANDSCAPING DEPENDABLE LANDSCAPING is offline
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We had the same problem it is the cap for gas.
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  #9  
Old 12-04-2011, 12:41 PM
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NEW CITY LAWN CARE LLC NEW CITY LAWN CARE LLC is offline
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Yeah I've seen the gas cap vacuum lock problem numerous times to suggest the easy tips first lol
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  #10  
Old 12-05-2011, 06:42 PM
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Petr51488 Petr51488 is offline
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I'm not sure if it was the low oil sensor (it was unplugged before) but i changed the gas cap and it fixed it! Problem solved.
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2008 GMC 2500HD Crew Cab Long Bed Duramax
2008 GMC 2500HD Regular Cab Long Bed 6.0
1998 Chevy Silverado 1500
Haulmark 6x12 Enclosed trailer
Bri-Mar 6x12,7x14 Dump Trailers
18hp Billy Goat Leaf Loader
Classen 5.5 Honda Power Rake
Stihl FS100RX, FS110 Trimmers
Stihl HL100K, HS81T Hedge Trimmers
4 BR600 Blowers
Stihl 029 Chainsaw
Honda 3 HRC216HXA Mowers
5 HS520A Snowblowers, 1 hs928was
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