Truck is "belching" white smoke.

Good afternoon folks. Every once in awhile, my truck starts to growl or rumble from deep within her bowels, shake a little, then "belches" white/light gray smoke out of her stacks. She's been doing this since I got her. Sometimes she'll go weeks without doing it, other times (like yesterday) she'll do it several times a day.

I have yet to add a drop of oil in her (besides regular changes at 13,000 miles). I get a sample done by the people in Ft. Wayne every change, and they come back stellar. Report says I can go to 16,000 between changes if I want. I also had her overheads done a month ago.

Can this have anything to do with the fact that she's "neutered"? It's a DD S-60, 14L, DDEC VI.

Looking forward to your insights.

 

Is the engine using any coolant?

 

Injector? Idk. It could be the harness too. Mine does the same thing once in three days or once in two weeks. Never figured it out. DD15.

 

No. I've NEVER had to add coolant since I bought her.

 

Yours rumbles and shakes also before belching?

 

The DDEC VI was plagued with injector issues ever since its inception. Basically the same injector as a Volvo D13, and we all know that story. I am obviously only guessing at this and taking into account that your "tune" and equipment mods are correct.

 

That would probably explain the weak power on any little hill? I thought doing the overheads might have solved this but no.

 

This ^^^^^ I would maybe think you might a injector cup that might be leaking also

 

I guess the injectors are next on the list to get checked out then.

 

Injector cups are easy to change when injectors are removed. Cups are stainless steel, so weak point is cup o rings.They just "unscrew" from head. You will need proper cup removal tool (amazon under $100) If ordering, make sure you get correct one. DDEC V used similar tool. Just different enough to not work on DDEC VI.