Diesel runs rough once warm?

   / Diesel runs rough once warm? #1  

~Joe~

New member
Joined
Dec 20, 2009
Messages
17
Location
NC
Tractor
Iseki TU2100F
Tractor: Iseki TU2100F - 24hp 3cyl

The problem started yesterday afternoon after several hours of use. It started runing very rough, was about dark so I parked it. Today, started right up and ran fine for first 20min and then went back to runing rough, no power. Checked the basics and all seems ok. I figure if it were the fuel filter or air in the line it would do it on startup as well.

Possible glow plug issue?
Could the injection pump cause this?
New to diesel so any advice would be aprreciated.

Thanks.
 
   / Diesel runs rough once warm? #2  
what are the temps like? If it's near or below freezing, it could be fuel problems.

With Diesel, many will run fuel treatment year round to help with the gelling issues.
 
   / Diesel runs rough once warm?
  • Thread Starter
#3  
what are the temps like? If it's near or below freezing, it could be fuel problems.

With Diesel, many will run fuel treatment year round to help with the gelling issues.

60 today, fresh fuel :confused:
 
   / Diesel runs rough once warm? #4  
The glow plugs aren't involved once it is started so that isn't the problem. Your injector pump might be worn and once it has warmed up a bit you aren't getting the pressure to the injectors. It is doubtful that if you had crud in the fuel tank that would take 20 minutes before that caused problems. How long has it been since the air and fuel filters have been changed? Is the coolant level ok? Does the tractor smell hot like your coolant isn't doing it's job? Basically are the oil pressure and water temp gauges working and showing you normal levels? How many hours on the machine?
 
   / Diesel runs rough once warm? #5  
If the fuel filter is plugging up it will run okay at idle and until you put some load on it and start trying to draw more fuel through the filter. I had a fuel filter plug up on a diesel truck I had, it still ran okay but way down on power. It gradually got worse until I was starting to wonder if it would get me home or not. Finally made it, a fresh filter got it back to normal.
 
   / Diesel runs rough once warm? #6  
Since he's in NC I don't think he has a freezing problem. Sounds more like contaminated fuel. Maybe got some water in the diesel. Another possibility would be a plugged air filter (runs fine on startup then needs more air once warmed up). If you were running it in a dusty environment that would clog the air filter.
 
   / Diesel runs rough once warm? #7  
Sounds more like contaminated fuel. Maybe got some water in the diese

That surely sounds like an item that should be checked out.:D
 
   / Diesel runs rough once warm?
  • Thread Starter
#8  
If it were fuel it would do the same on startup correct?
 
   / Diesel runs rough once warm? #9  
Fresh fuel means nothing. Both times I have had fuel issues it was just after fueling up. PULL the Fuel Filter and take a look.

Chris
 
   / Diesel runs rough once warm? #10  
If it were fuel it would do the same on startup correct?

If it were fuel quality, yes. Filter problems (fuel quantity) take longer to show up, since the engine uses very little fuel at idle or unloaded. Once it has burned what was in the filter, it has to draw more fuel through the filter, ergo the problem.

If you haven't changed the fuel filter recently, it's a good place to start.

Chilly
 

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