12.7 detroit smoking and rattling

Mine does it on occasion. I have air bubbles returning to passengers side tank only. After idling especially, it smokes, and misses, till it’s revved up. Then goes away. It’s an air in fuel problem I thing. Like it almost loses its prime. Maybe yours is sucking air between tanks and fuel pump. Maybe a timing sensor or bad wire? Those are my guesses on mine.

 

Possible. Like i mentioned before, anything causing loss of compression will have the same symptoms.

Mis adjusted valves, timing, jake, etc. With no compression it can't burn fuel.

 

Someone had a Jake problem, on here recently, had them rebuilt. Another thread, maybe it was yours?

 

Because of no compression. Cut out the fuel, smoke stops. No compression puts raw fuel into the exhaust.

They're in the right direction

 

Yes. Probably not the injector. They know it's been replaced. They need to check valves and see if something is holding one open. Then pull rockers and check valve height. If one is noticeably higher than the others, or lower, there's issues.

Finally yes, pull the injector and stick a camera through the cup to check the piston and cylinder wall.