Is this a sign of a bad injector?

[oachs83]

I have a 2004 Lull 944e-42 with a 4 cylinder diesel engine. Once at operating temperature and you are closer to or at full throttle it will sputter, lose power and kick out a lot of white smoke with a faint bluish hue. It will not do it all the time as there is times I can use it the entire day and it’s fine and other times it becomes almost unusable. I noticed on the bad days if I shut it down for 10-15 minutes it will work okay for a bit but then start acting up again.

The oil and coolant are all where they should be and I have not lost any fluids during this issue. Does this sound like a bad injector? Thank you.

 

[Nige]

Without being there it sounds almost like a shortage of fuel. Before diving into the fuel injection system have you done the basics such as replacing the fuel filter, clean the screen/water separator (if equipped), make sure the breather in the fuel cap is clear, and drained any water & sediment from the fuel tank.?

 

[oachs83]

I did replace the fuel/water separator filter but just noticed there is an inline metal fuel filter as well. I’ll try that and look at fuel cap too. Thank you

 

[Nige]

just noticed there is an inline metal fuel filter as well. I’ll try that and look at fuel cap too. Thank you

In addition don't forget to drain enough fluid from the tank to ensure that you remove any accumulated water/cr@p that might be lying in the bottom.

 

[oachs83]

This inline filter was hidden behind the motor and Fran and I frankly never knew it existed. I just replaced it and it seems to be running much better. Need more seat time but it’s night and day difference from this morning.