Were stumped??--a feind just bought an older model used GM diesel & on his way Home Me following all of a suden! anemonous amont of White smoke came pouring out his tail pipe! it wa So BAD I couldn*t see any thing! He shut it down & pulled over WE checked but every thing seemed Normal? I removed the Air cleaner & saw Mist? or Fog? in the manifold--WE waited a few minutes & It started right UP & ran Normal--Off we went again--10 or so miles latter Same thing happened? WE did the wait thung again & finally made it to his Home but I dono? & niether does He? any one KNOW?? what the problem IS?? WE called the GUY he bought it from! He says it never happened to HIM?? my friend Don*t Dare drive IT! as it REVs UP really Bad & Hes affraid to Blow the engine UP? --Ole JIM--

 

It's getting an alternate fuel souce from somewhere.
See if there's oil in the intake tract from a blown seal in the turbo, or an high oil level in the pan due to a leaking injector.
It sounds like it's a runaway situation.

 

well if it was a run away situation getting an alternate fuel source from anywhere other than the injector then it wouldn't shut down..... but i dono.... tell him to trade it in on a dodge...

 

more details... the gm diesels have a CDR valve on them to reburn the crankcase vapours [like a pcv valve].. a little vapour/mist/fog in the intake from it can be normal.. as for the white smoke???.. if it is a turbo engine and egr equipped, you could get massive black smoke if the egr sticks.. if the fuel pump goes nuts [electronic control] you could have a white smoke situation if the pump goes full fuel and the timing goes way retarded...

 

Sounds to me like the time one of my GMC Buddies in his 01 had alot of water in the fuel in Florida!!!! Well this only helped the #3 Cylinder Injector Crap out and the entire piston was burnt to he}} and back!!!! Thankfully GM had a recall on his injectors at the time and the entire motor was replaced!!! Good Luck!

 

I DONO? here the Weird part He contacted the original Owners--Ole Couple--beautiful Truck--they drove it all the way from Montana--to Maine & it never missed a beat as they now live w/ thier SON & his wife--they showed Him receipts of work done just before they came to Maine--new delivery Pump-- injector Pump & tune Up truck looks like New! not a scratch on it any where! thier Son operates a Car rental Co--all nice people--a local diesel mechanic is going to look it over? the previous owner made the Appointment & Hes as confussed as we are! my freinds a perfectionist! hes a contractor & does re-modeling small business--I does all thier sons work--thats how He met the original owners--as soon as I find out? what the problem Is? I*ll keep you all Posted!--Ole JIM--

 

The Diesel Page

 

GEE! I*M really Surprised No ones ever had this happen to them? the Over Reving? & white Smoke WE won*t be able to find out any thing? until some time Monday? as thats when the diesel mechanic gets to look it over!--Ole JIM--

 

Check the fuel return check valve on top of the injection pump, if the pump is going bad it will send small bits of fiber in the check valve and plug it up, then it over pressurize the pump.

My old 6.9 used to do the same thing, same pump on both.

The check valve is a short fitting screwed into the pump, then the return line goes into it.

Rick