Random puffs of smoke?

[RSchwarzli]

On the weekend while towing a 10,000 lb trailer, my father who was traveling behind noticed alot of random puffs of black smoke coming out the stacks. He said they were about 5-10 seconds apart, mostly while going up hills. What causes this and is this something to be concerned about?



Thanks!



Robert

 

[RSchwarzli]

Anyone have any thoughts?

 

[JGrefenstette]

robert.

this reminds me, ive had some what of the same issue with my 93'. i havent pulled anything with it yet, but i have notice when pulling up this one mountain, that if i watch my pipe i do occasionally get a short burst of black smoke. its really random. it only seams to do it under a load with steady throttle pressure, not accelerating, just maintaining it.

anyone have any clues? could it be that our injectors are getting a little worn out and there showing it when we lug the motor.

robert - i dont no what rpm you were running when you noticed it, but i felt like i was probly chugging mine a little when it would puff.

 

[RSchwarzli]

I was running 2300 rpm, 22psi and about 750* aft turbo. Almost WOT, but not quite.



Robert

 

[rlyons]

It's more than likely just the governor kicking in and out trying to maintain a steady speed. Not anything to worry about.