Sounds like you got some good blow by if you are still smoking after warm up.

It's all blueish white smoke right?

Start monitoring your oil and coolant levels for one. Maybe smell the crank oil for fuel or get the oil checked at a lab for fuel content.

While the engine is idling take the oil filler cap and place it upside down on the filler hole if it blows off I guess you got some good blow by and replacing injectors aren't going to help that. Next step would be to do a compression test on each cyclinder.

I bought my first powerstroke a few weeks ago

How do you know the knock is not normal?

The knock could be starving injectors from low fuel pressure or yes air in fuel. If you want to check for air in fuel I suppose you could get the return line from the fuel bowl to pour into a large glass jar and look for bubbles or foam. I could not really tell you more with out hearing the knock.


Do you have access to some one with auto enginuity sofware? If so they might be able to tell you something?

Good luck.

 

I would think if you had a leak between the pump and engine you would have a fuel leak. If it were on the tank side of the pump it might suck some air. I don't know for sure. Good luck

 

Ok frashdog so I tried your cap trick. It slides off after 4 seconds. Lots of engine shaking and tilt though so its hard to tell if its not just sliding off from that alone. There is some smoke that comes out of the oil fill cap but its not billowing or thick just a steady small amount. Isn't some blowby normal on these engines because of the high compression? Its only got 140k on it, i thought it should be just getting broken in...

yea the smoke from the tailpipe is mostly white w/ a blue tint and smells strongly of unburnt fuel. It smokes from start untill warm, then on hard acceleration but not very much when idleing warm. It's always 75 degrees here so the engine is never very cold.

Its not burning any coolant Ill start monitoring oil now. 3 of the 4 injectors I replaced had lots of carbon build up on the nozzles... do you think if the other injectors have carbon build up or partially clogged nozzles that could cause my symptoms or would a clogged or dripping nozzle keep oil from squirting out the oil spout?

 

Ok frashdog so I tried your cap trick. It slides off after 4 seconds. Lots of engine shaking and tilt though so its hard to tell if its not just sliding off from that alone. There is some smoke that comes out of the oil fill cap but its not billowing or thick just a steady small amount. Isn't some blowby normal on these engines because of the high compression? Its only got 140k on it, i thought it should be just getting broken in...

yea the smoke from the tailpipe is mostly white w/ a blue tint and smells strongly of unburnt fuel. It smokes from start untill warm, then on hard acceleration but not very much when idleing warm. It's always 75 degrees here so the engine is never very cold.

Does not sound like the blow by is that bad. Some blow by is normal. Can't really tell how bad unless you do a compression test. It should by fine at
140k, but you never know how it was treated proir to you. Poor air filtration (dusting) or over extending oil change intervals can push an engine to early demise. Do you know the history of service?

Its not burning any coolant Ill start monitoring oil now. 3 of the 4 injectors I replaced had lots of carbon build up on the nozzles... do you think if the other injectors have carbon build up or partially clogged nozzles that could cause my symptoms or would a clogged or dripping nozzle keep oil from squirting out the oil spout?

I'm not to familiar with injector trouble shooting but, sounds like it may be your injectors as per what you found on the others. Did you change the fuel filter? Did truck sit for ling period of time? How old is fuel?

 

If I had to guess its probably a cracked injector nozzle. ####ty part is that they are real hard to see with the naked eye.