Strange BX Starting Issue

[pap71]

may be talking about the fuel pump, one injector shouldn't be real expensive

Fuel pump wouldn't cost much either. Maybe the injector pump?

 

[tjkubota93]

Is the dealer telling you that only one injector is sticking? I am trying to understand how one injector can cause this. I am not a diesel mechanic but worked for a GM and Honda dealer ship for 35 plus years. I have had many cars with bad injectors but the engines never reved like that. I know this is two different animals but am trying to understand how a stuck injector can cause this.

A gas engine's speed is controlled by limiting air with the throttle.

A diesel engine's speed is controlled by limiting fuel, it can get as much air as it wants.

So-any extra fuel can result in uncontrolled engine speed. I have seen more than one do it. The most memorable was one that was grossly overfilled with oil.

Thats the basics. After that you gotta look at interwebs or pay your local community college for some learnin.

That engine has an injector pump and poppets. A stuck poppet would not result in a runaway. Neither would a fuel pump. An injector pump could. They are high $ too.

 

[drssg]

Thanks for the overview, tjbeck93. The tractor's still in the shop, so I'm just going from memory and a phone call with them. I'll confirm the actual parts that were replaced when I get the paperwork.

 

[whis]

I can't spell or type very well that's why I said fuel pump

 

[l0ad3dr3v0lv3r]

Hi all. I know this thread is pretty old, but I have been having the EXACT same issue here in Ontario were we're sitting at -12 right now. Tractor would fire up, rev extremely high and stay there while black smoke shot out the exhaust. After several minutes the RPM's would start dropping, even if I gave it more throttle, right to the point of sputtering and then dead, and then nothing would get it to turn over again. This morning I added some diesel fuel additive and it seems to have at least temporarily fixed the problem. I'm hoping that was it as that was a cheap fix. I was hoping drssg would let us know what was finally fixed on his tractor and if that resolved the issue?

 

[drssg]

I reread this thread, and I noticed that my final post was that I would post the exact part that was replaced, when I got the tractor back from the shop, which I never did. Sorry.

I found the paperwork, and the part description just says ASSY PUMP, but the comments described it as an injection pump. The part number is 16006-51012. Just that part cost $830, seven years ago.

That fixed the problem, but a year later I had another fuel issue in that it would crank, but wouldn't start. They initially suggested replacing the same pump again. When I reminded them that the pump was only a year old, they suggested that they could ship the pump out and have it serviced. That was $369.

Since then, the tractor has run well, with daily use. I never did try using fuel additives or cleaners. I would say that you may or may not have resolved your issue. My original issue was sporadic. Good luck.