I just bought another 7.3 and its pullin some stuff on me. When I start it its not smoking or surging or anything but after it runs about 3-4 minutes it will start smoking blue, but the tricky part is that the blue smoke does not smell like oil at all it is clearly fuel smoke by scent it burns your nose and eyes. Now I think it is bad injector o-rings because of the blue smoke and fuel scent, but I want to know what yall think before I dig into it possibly chasing the wrong thing. the truck is a stock 96 with 195000 on it and injectors appear to be pretty sound because this truck will **** *** its just smoking.

 

coulif its fuel u could have a cracked injector cup or a nozzle could be getting stuck

 

But wouldnt I be experiencing at least a little power loss and a miss? I also forgot too mention above that the smoke will totally clear after about 5 miles of driving and wont come back unless I idle for long periods of time or shut it down for an hour or two and restart.

 

ya true it would be missin if it was an injector cup... do u have a lotof blow by?

 

Yeah quite a bit of blow by thats another reason I am thinkin injector o-rings. I think they are letting some compression escape around the injectors causing blow by because the piston rings are fine. And the motor is tight.

 

sorry toook so long to reply ...are you haven any water loss?

 

if its got blowby wont it smoke 24/7??

 

all motors have nblow by just depends how much

 

Blow by is not caused by injector O rings.

Run a cylinder contrubution test, buzz test, compression test and leak down test.

That will tell you all you need to know.

I would bet you have some injector issues, but I doubt its the external O rings, more then likely some internal issues with the injectors with 200k.

 

my truck has 205+k and it smokes pretty hard when its cold but as soon as it warms up there is hardly even a haze at WOT.