12.7 Detroit need a new turbo (upgrade?), hauling light and best mpg?

FYI, that oil in the ECM can wreck it if left alone. It's coming from your injector harness. Oil can actually travel down the inside of the wire and into the ecm.

See it fairly often where an ECM is 1/2 full of oil.

Swap that injector harness ASAP

 

It looks to me like it's coming from the seal though.

 

I don't doubt that the cam seal and thrust plate o ring are leaking, but it's almost impossible for oil to get into the ecm from outside. The seals are very good.

Pull your two injector harness plugs, white and black on the front of the ecm, and see if there is oil in them.

I've never seen an oil leak cause oil to get into the ecm. Injector harness leaks are very common.

 

I see now. Thanks. Will check it out

 

k31 here. i still have my 171702 for sale if any interested.

 

i just got my computer fried. due to oil. mechanic says it can go inside the oil pressure sensor wire. might as well replace it . its abiut 50 bucks. very easy to do

 

on another note. so i have decided to slow down to 60 mph and this is my current mpg. im pulling an empty dryvan in FL. ill post an uodated when running loaded. at 65 67 mph i was getting 7.2 loaded so we ll see how it goes

 

The Dash Numbers wont do justice unless your Ecm is set Bang on to read milage If it has been tuned its likly off

 

Do manual calculation

 

is not. i do manual calculation and the dash is accurate