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Onan Engine Stalls when tractor bounces


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#1 MountainBuzzMan OFFLINE  

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Posted May 02, 2015 - 09:55 PM

Hi Guys,

 

I was mowing today and I was going down hill and hit a dirt mount that made the tractor bounce 2-3 times.  Each bounce would stall the engine for a bit.  Everything was fine within a second or two. 

Is this normal?  I picture the fuel sloshing around in the carburetor bowl.

 

It bounced later, but only one little bounce and there was a hesitation that time as well.  



#2 wvbuzzmaster OFFLINE  

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Posted May 02, 2015 - 10:17 PM

Is your battery secure? Could be bouncing up and shorting out on stuff... It's a thought. Otherwise you could have a wiring issue somewhere...

Edited by wvbuzzmaster, May 02, 2015 - 10:18 PM.

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#3 Hobal OFFLINE  

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Posted May 02, 2015 - 10:22 PM

I would venture a guess that you have a low oil shutoff sensor that kills the engine if the crankoil level is too low. Or a ground short thats killing the spark. Maybe look for anything that maybe rattling, or a weak worn spot in the positive run of the wiring? My guess is crankcase oil level. Good luck sir.
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#4 MountainBuzzMan OFFLINE  

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Posted May 02, 2015 - 10:50 PM

I checked the oil before and after I mowed and it was full. 

 

So you don't think it is the carb?  I will double check the battery to make sure it is secure.



#5 cpg OFFLINE  

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Posted May 03, 2015 - 04:51 AM

Carbs shouldn't be that affected by a bump. I have driven all kinds of carbed tractors over bumps and never had an issue. I would also say look for wiring shorts as my first guess.


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#6 MH81 ONLINE  

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Posted May 03, 2015 - 06:01 AM

If there is enough condensation in the bowl of the carb, it could be causing issues when sloshing.
I'd check for a loose wire and run a little dry gas thru it to see if anything makes a difference.
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#7 olcowhand ONLINE  

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Posted May 03, 2015 - 06:27 AM

More than likely an electrical issue, as most fuel issues aren't that short in duration.


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#8 JDBrian OFFLINE  

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Posted May 03, 2015 - 06:28 AM

I'd give all the electrical system a good once over. You could have a short or a bad connection somewhere which is cutting off the spark. 


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#9 olcowhand ONLINE  

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Posted May 03, 2015 - 06:36 AM

Electrical problems are tricky to find sometimes.  I had a Massey 85 lawn tractor that misfired ONLY during left turns.  I looked over the wiring well and didn't find anything.  Then I went into the carb a few times, again finding nothing.  Finally I pulled the engine cover and discovered a loose mag coil.  Tightened it & problem gone.  You don't have magneto of course, but anything loose can cause your problem.


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#10 KennyP OFFLINE  

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Posted May 03, 2015 - 06:42 AM

Lots of good suggestions here. It might not hurt to check float level/possibility of a small amount of water in there. I know mine are real temperamental of the float level. Which Onan is this?


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#11 MountainBuzzMan OFFLINE  

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Posted May 03, 2015 - 08:23 AM

Thanks for all the suggestions.  I will look for wiring issues. If it is subtle now, it will only get worse.

 

The Engine is a T260G 24 horse.


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#12 Shotgun429 OFFLINE  

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Posted May 03, 2015 - 11:05 AM

Seat sensor,  This normal on bounces.


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#13 MountainBuzzMan OFFLINE  

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Posted May 03, 2015 - 11:11 AM

Seat sensor,  This normal on bounces.

I will check it.  But I think it is to old for that.  I don't think there is a sensor as it is designed to be quickly removed to change position. (Leg Room)


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#14 KennyP OFFLINE  

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Posted May 03, 2015 - 01:31 PM

I will check it.  But I think it is to old for that.  I don't think there is a sensor as it is designed to be quickly removed to change position. (Leg Room)

Okay, we are talking about your FF24 tractor here, right? No seat switch there I know off. I'd have to look at an electric diagram to see what safety's these have.



#15 KennyP OFFLINE  

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Posted May 03, 2015 - 01:45 PM

Here's some pics so the rest of you folks can see how these are wired.

FF24 wiring.JPG     FF24 wiring2.JPG

FF24 wiring3.JPG


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