cummins... bought used.. had it 45 days, never smoked. Til other day.. 144k miles.. new injectors at 130k bosch brand (have reciept from shop) started to run stanadyne (lube formula) since april1st.. (day i bought it) starts, and idles fine.. power seems good. Great mpg 16.4 in town. Stock except for AFE intake and 5" exhaust and cummins exhaust brake.. hauled camper last weekend(8K) .. went great.. started to puff black at start up after that.. i used exhsust brake alot that weekend.. now "sometimes" it puffs white at cold start, then goes away..always has a little black at cold start.. almost no blow by when cold, and even less when warm.. coolant level is full, never changed.. keeping an eye on oil level to see if its burning it thru engine or leaking at turbo..also warching to make sure it dont rise from leaky injector.. cleaned air filter twice since i bought it just to be sure..
Im thinking..sticky injector, needs new fuel filter (which i ordered a 5 micron to change it out), scored piston wall or bad ring, valves out of adjustment, valve guide seal, leaking turbo??
I didnt run it hard pulling camper, so im sure my EGT's were good..
Am i on the right track? Im a diesel newbie..thx for reading, any info/advise is appreciated
Last edited by Lil evil; Today at 10:03 AM.
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Old Today, 09:59 AM
Lil evil
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Could be fuel filter- I wouldn't worry about it too much honestly. Is it just smoking at cold startup or when driving as well? Not turbo, would be fuel/injector related if anything but you would notice it running poorly also.

 

Not when driving, only get a bit of black if i get on it from turbo lag.. last 2 cold starts has only puffed a little of black smoke..no white.. i have Zero blow by now..checked it today..cant hardly feel any air coming from oil fill hole, and no smoke from there

 

I wouldn't worry about it, sounds normal to me. I had some smoke during cold starts with stock injectors especially if I didn't let the grid heater cycle. These motors don't like the cold but are more tolerant than most others!