I have a 7.3 IDI turbo. It has a little knock at high speed. I had to replace injector pump, lift pump, and injectors. This has helped with the knock but it hasn't stopped it. It is not smoking at high RPM anymore but at an idle it still does. Is there any suggestions on what I should try next?

 

welcome to diesel bombers and where does it sound like its coming from maybe needs valve adjustment go here and introduce yourself Diesel Bombers Introduction - Diesel Bombers

 

The sound is not all the time. It is on the left side down low.

 

its not a lifter or something of that nature is it

 

We are not for sure as we have not checked that. How would I check that? But that wouldn't cause it to smoke would it?

 

ok cummins boy, back to your side...

these engines do not have valve adjustments. hydro lifters.

i hate to say it but could be a wrist pin. i just seen one come threw a buddys shop that had a knock on right bank, ended up being wrist pin on num 7 cyl.

 

Will that cause it to smoke? I have another question if the fuel injector pump is turned up too high will it cause the knock at high accelaration and smoke at an idle because of over fueling?

 

could be a timing issue, did u have the pump timed after installing the new IP?

 

No it was not timed. But we have advanced and back it back off and it does change the way the knock and smoke is.

 

have it timed properly if possible,

as for the smoke, any color, smell? if it blueish? white? grey? smell like antifreeze?



u say left side, is that from in the drivers seat?