1994 F-350, starts and runs great under a load. At idle smoke a little, under no load, such as coming down a hill half throttle, smoke is terrible. Blue in color and burns nose and eyes. Under a load smoke clears up, has plenty of power under a load. New filter, conditioner and injector cleaner and two tanks of new fuel run through system. I just purchased to pull trailer with mini excavator and light dump loads. Runs great except for this smoke.
Truck sat for about a year without running prior to my purchase. Ideas?

Thanks,

Wayne

 

Welcome To FTE ...

how much have you driven it since you bought it ?...

 

I've had it for about 2 months, maybe 750 miles in total. I think I have driven enough to get the cobwebs out. When I first started it ran rough and smoked much worse. The fuel conditioner treatment and injector cleaner helped almost immediately as far as smoothing out how it ran. Does not lack at all for power, just the dang smoke.

Thanks for your help [and the welcome].

Wayne

 

Strange that it smokes down hill and not up. I assume black smoke?

Welcome to FTE

 

I guess what I am looking for is a direction more than anything else. Should I be looking at the pump, the injectors, injector seals?

Thanks again for any help.

Wayne

 

Not black smoke at all Neal, thats the strange part. At light throttle to maintain speed on a downgrade the smoke is very heavy and blue/white. Smells of raw fuel. If I let off the throttle completely the smoke stops or put a load on by accelerating, the smoke stops. Well it doesn't stop. it becomes normal black smoke of burned fuel. I've been around a lot of diesel engines over the years [never a PSD] the closest to this situation is an like an old Detroit with bad rings that doesnt burn the fuel completely, but that is all the time, idle under load, doesn't matter. Plus I have great power and it only smokes when not under a load, which doesn't lend itself to bad rings.

Wayne

 

When I got mine it smoked like a freight train ,,it also had been sitting awhile ...Very soon ,,the IPR stuck & it wouldn't run,,,after changing the IPR ,,the smoke went away ,,,

On a gasser ,,what you are describing ,may be valve seals ..

but yours is fuel ,not oil ...IPR could be sticking closed a bit too long ..do you have access to a scanner ?...

 

Yes, I'll check the codes and see if anything shows.

Thanks,

Wayne

 

Don't need codes ... need live data ....ICP pressures, IPR DC % ., ect....

 

i assume this is definatly a powerstroke and not an idi?

 

Good call ...

 

makes a world of difference for diag....

 

which ever it is it kind of sounds like a sticking injector

 

No turbo, it's IDI.

 

That changes things. You will want to go one forum down. I will contact a mod to move this thread for you. They will be able to help you in the IDI forum. Good Luck!