2000 ls180 low on power intermittent(sometime very low)

[Bighot-dog]

Hi, i bought my nh ls180 about 1 year ago. The hour meter show only 710hours at this time. when i receive it, it run strong and have more power than i need it. Since around 10 hour of work with it, it has bizare power problem. The power of engine came low, sometime very low and occur at all engine temp and all wheather. First time i've notice the problem , when i work on a muddy terrain, the power came down as low as i can stall the engine just try to move in muddy landscape OR lift heavy bucket. The engine restart good and the power came back. it run good at idle and engine rev good when you give throtle. Sometime when the problem is there, i just shutdown/restart it, and i can work again. The power is never at top since the start of this. when i try to start moving fast with it, the engine drop around 3-400rpm,but sometime 1000+rpm drop and i need to let the comand back to let the engine re-rev up. When it happen , as soon as the engine rev up , i ear the turbo whistle to help engine but power arent good when i load it. I dond see if it make some kind of smoke at this time.... Itry to use it whitout the air filter for a test but that change nothing. i've change the fuel filter and again , no change. All oil and coolant level are ok. I've check all clamp and tube on intake. All help will be apreciate, thks I see on some forum that the ``lift pump`` is a common problem on this model, could it make small and huge power problem on the same workday ?

 

[antfarmer2]

I would pull the fuel line closest to the engine to cheak the flow.......sound like restricked flow or bad line sucking air

 

[Bighot-dog]

I would pull the fuel line closest to the engine to cheak the flow.......sound like restricked flow or bad line sucking air

You talk about the line between the fuel filter and fuel injection pump ? i think that in service mode, the electric fuel pump should run constantly... how much fuel is consider corect for this test ?, thnks

 

[antfarmer2]

You talk about the line between the fuel filter and fuel injection pump ? i think that in service mode, the electric fuel pump should run constantly... how much fuel is consider corect for this test ?, thnks

It should be a good stream the excess goes back to the tank

 

[antfarmer2]

It should be a good stream the excess goes back to the tank

Could be water in the fuel or loosen the fuel cap could be a pluged vent

 

[jerry]

Could be water in the fuel or loosen the fuel cap could be a pluged vent

Check your lift fuel pump, mine acted a lot like that and it was loose in the body clamp. If you have the little round canister pump grab it and see if you can wiggle it or turn it in the clamp. The clamp is the ground for the pump.

 

[jerry]

Check your lift fuel pump, mine acted a lot like that and it was loose in the body clamp. If you have the little round canister pump grab it and see if you can wiggle it or turn it in the clamp. The clamp is the ground for the pump.

Mine would idle but drop off to almost no power under load, I thought the fuel had gelled but it was pump trouble.

 

[jerry]

Mine would idle but drop off to almost no power under load, I thought the fuel had gelled but it was pump trouble.

I was wrong the clamp is not the ground but redoing the clamp and ground wire did fix my flow trouble.

 

[Bighot-dog]

I was wrong the clamp is not the ground but redoing the clamp and ground wire did fix my flow trouble.

thks a lot, i'll check that this week and come back on that

 

[jerry]

thks a lot, i'll check that this week and come back on that

If it is set up like mine take the hose off the outlet of the pump first and check for flow, if good then hook it up and take the hose off where it connects to the injection pump and check flow there also. On mine to make the pump run continuously I have the service/run switch on service. Hope it helps , at least you will know it has good fuel supply. You did change all the fuel filters?