My truck started acting up a couple months back with blowing oil out of the blow by tube and covering the bottom of the truck.. Changed oil thought I overfilled it, ran good. Then started a rough idol and light white smoke, found out through a computer test that #6 injector was bad replaced it along with oil again and still misses and blow white smoke until engine gets to 200.. The other day we switched #4 and #6 injector to make sure the new injector was good and still on the computer when individually shutting down each injector #6 does not change the tone. i had a smarty and an edge juice with attitude on it and took the smarty off and have my edge on 0 or stock.. Out of ideas anyone had this problem before or can point me in the right direction?

 

Blowing oil out the tube IS very bad! More than likely you melted a piston! Blow by
test done?

 

No need for blowby test. You did melt a piston either from overheating or a stuck open injector, probably injector. #6 is always the first to go. Stacking chips that way is asking for trouble.

 

I had a similar issue it ended up being both broken compression rings on #6 cyl.

 

just going through fixing the same problem i had a valve seat come loose on cyl6 and broken rings on 6 and 1 broken ring on cyl 1. Id start with pulling the head and seeing what damage is done could be lucky like me and just need to hone it out put new rings in and have the head rebuilt worse case you might have to pull the motor and have it machined.

 

Any updates on the diagnosis or repairs?