I haven't seen this discussed here. When I first start my engine I get a puff of black smoke, is that just a momentary rich mixture from fueling while turning the engine over or do my injectors leak after shutdown, or is it soot from my last shutdown?? I noticed when I tried setting the timing up it got worse? I assume everyones truck does this...or not? Its kind of embarrasing when someone is standing near the exhaust when I start it in a parking lot or gas station.

 

It is normal to get a puff of smoke upon start up. The VE pumps on the first gen's do this. The VE pump starts the engine at full throttle untill it gets to idle speed.

 

So thats why you never need to touch the throttle when starting. Learned something new.

 

So, the 2nd Gen Cummins don't start off in the full fuel position? I was under the impression that all mecanically goverened diesel did.

 

All diesels I have ever seen puff on start up... don't have any experience with 3rd gens, but my grandpa's truck (a 96) puffs too, and that's the p7100 pump.

 

haha, my truck loves to let out a puff of smoke and startup, and some nice little black chunks of carbon out the stacks...not a good thing to get on the girfriends clothes...

 

Ahhhh, I think I see were you're going wrong....scrap the clothes..... ;D

Pastor Bob: ... and Adam said unto Eve... stand back I've no idea how big it's gonna get.... ;D

 

Pastor bob??? You're all over the place, man!

 

Personally, I like doing that to certain people ;D

 

Nothin wrong with puffin on the guy next to ya at the gas station, maybe he will decide to get a diesel to fight back with lol

 

[quote author=furious70 link=board=9;threadid=23422;start=0#msg220718 date=1070979468]
Personally, I like doing that to certain people ;D
[/quote]
Hey, me too...and Bob, I tried that excuse already....next time she came wearing all black, I thought she went goth or something....decided not to say that again

 

Most all Diesels start at WOT untill RPM picks up to where the governer is set.

The 24V's start WOT untill idle RPM is achieved. My P-7100 12V has a hard time starting becuase of the screwy governer springs in it. A light tap on the throttle, and she lights off with a flick of the starter. The '03's also start with the ECM telling the injectors to throw lots of fuel.

The puff of smoke is perfectly normal. It is "rich" or overfueled for just a moment, and that's why you see the puff.

Merrick

 

IT is also my understanding that Diesel normally start in a more advanced state of injection than what they normally run at. Opposite of what a spark ingnited engine does.

 

I'm glad to know that, I've wondered the same thing since I got my 1st Gen several years ago. Seems like it's puffing a little heavier now.