Chattering ISX15

[Rawze]

If you suspect egr cooler leaking there will usually be signs of it, like IMAP and crossover pipe building up with crud.

Are you doing any oil sampling (with an actual lab, not a speedco quick-check BS machine) to check for higher then normal wear metals or coolant dillusion?
Has the dips$it stealershit even bothered to suggest you do this?

If you want to test egr cooler for leaks ...

Remove the elbow pipe from the back side of it and pressurize the coolant system to 20 psi and let it sit over night. - Check for coolant seepage in the back of egr cooler next day.


As far as fuel mileage loss etc. do the usual tests like pressurize engine and check for CAC, egr and other leaks.

Also ensure your not getting air in the fuel system. could be something as dumb as a fuel filter or line getting air past an o-ring, etc.

Maybe make an appointment with Mr. Hag to have him test drive it and get a second perspective/perhaps different direction to go in.