black smoke from cummins exhaust?

I have found that since the reduction/elimination of sulfur in the fuel, everyone is smokin. Today you can see every shift from every truck...there was a reason for the sulfur in fuel, to make it burn cleaner and hotter. Now to get the hot burn we are adding some additive here ane there...and son of a gun, our cost to operate gets higher, but the other side of us paying more is someone is making more...ON OUR DIME!

 

its probley turned up, as long as your EGTs are not getting to hot then your good.

 

being an 88 im guessing its a mech motor, isnt there a smoke adjustment on the fuel pin/diaphram like on the smaller cummins motors.

 

It is common on the mech. engines it is not due to the low sulfur all these mech engine smoked a little and when you changed the button in the pump and cranked them up they would smoke like a train.

 

Those engines will smoke when you take off or shift gears until the turbo spools up again. If the pump has been turned up it will smoke a little more. The pump has a little thing on the top called the aneroid that is supposed to limit the fuel until the boost comes up. Sometimes the diaphragm inside it goes bad and it will smoke more too. There should be a 1/4 inch steel line going from the aneriod to the intake manifold. On a hard pull it would not be unusual to see 1000 degrees on the pyro. Just going down the road not working the engine too hard, I would guess you would see 600-700 degrees.

 

yeah id keep it under 1100-1200 my c15 acert sees 1000+ on mountains


what are your pyros now?

 

I am glad you still have the 1988 377 Pete. Black smoke is common in an old truck like yours. I would like to come out there and drive it for a week. It would be like a trip down memory lane.