Smoking under no load

[FarmerJG]

Need some info I replaced 3 injectors about 3 weeks ago and the truck ran right for about two weeks then it started to smoke when I started it up and gradually got worse. Everytime I let off the throttle the truck would starts blowing blue smoke untill I got the rpms up so I pulled it into the shop pulled the egr valve and turbo and cleaned them both.

Now when I am driving down the road everthing seems fine running 22 psi of boost and no smoke but when I stop put it in neutral and give her some throttle she smokes bad any ideas.

[Newman]

What did the EGR valve and the inside of the intake look like?

[FarmerJG]

The egr had some coke build up not to muchit it didn't seem stuck but I'm not sure if its working properly can't get it into the dealer until mon for a diagnostic

The intake had some oil in it

[rollincoal6.4L]

What did the CHRA seal look like. Was there any oil on either the compressor side or turbine side of the turbo, if so then the CHRA oil seal has failed and the CHRA needs to be replaced and the intercooler flushed of the excess oil.

[FarmerJG]

I was a little worried about that but there wasn't alot of oil their what was there might have been from the valve cover going into the intake and the truck seems to be getting a lot of fuel that is not burning it doesn't seem like oil is causing the smoke but I could be wrong

[rollincoal6.4L]

Was there any oil on the exhaust side of the turbo, not on the intake side.

[FarmerJG]

There wasn't any oil present on the exhaust side of the turbo I did end up running some injector cleaner through her it's not smoking too bad anymore just on start up think I'm back to another bad injector should have changed all 8

[howell_jd]

You really need to check for diagnostic trouble codes (DTCs). Throwing parts at a problem is a sure way to lighten your wallet and occupy your time but is not certain to correct your issue. Start your assessment with codes.

Having changed the injectors you could have improperly seated them allowing oil and fuel to bypass the gaskets and/or o-rings causing your smoke. Recent work is frequently a good spot to double check.

There is oil in the turbo on the compressor side because of the positive crankcase ventilation (PCV) system. There will always be oil in the turbo on the compressor side unless you do a crankcase ventilation (CCV) reroute with inline filtration. Your description of the "valve cover going into the intake" is spot on for the PCV system. Oil vapor is picked up along with combustion gasses that blow-by the piston rings from an earlier compression-combustion cycle and recirculated to burn off in a subsequent cycle.

The turboshaft or CHRA (center housing rotating assembly) is oiled of course and if not properly cooled down before shut off, the oil may coke and cause the turbo to seize but this isn't likely to be demonstrated by excessive smoke out the tailpipe. It will throw a code. You won't likely see 22 psi of boost though because it will seize. If it's leaking then you'd see the most smoke under load not with no load as you describe...although anything seems possible with the 6.0L sometimes.

Codes along with a description of your truck's year of manufacture, mileage, your driving habits, and any modifications will further help any "on-board" assessment.

Good luck!

Jonathan

[FarmerJG]

Thanks and most of the time when trying to diagnose these 6.0 I have found that they don't throw a code which is what this is doing back to checking the injectors proly going to go to the dealer