Between Omaha and Des Moines, 7 miles South of I80 | cheddarbob56 - 10/17/2012 11:03 That makes alot of sense, I didn't think about that earlier. So you're take on it the problem is the motor swap and the ECM not talking to each other.
Your jake problem, can't be the motor swap, from 3406E to C-15, BECAUSE you stated that it worked, when you purchased the truck(assuming the C-15 was already installed).
Have you tried, shutting OFF the cruise switches, and just try the jakes, setting still, in the yard, but you have to rev up the engine and let it coast back down to idle, when testing, WITH jake switch ON.
Also, are there jakes switches, on the tranny shift tower???? Are they turned ON???? (Some trucks have those, too)
Another thing, Did you put the correct mounting bolt, for the jakes oil supply, into the correct holes, that hold down each jake head, onto the rocker arms????
Edit: Did you set rocker arm shaft, down correctly, to supply oil to jake heads, too?
Edited by 4WD 10/17/2012 12:19
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Peterbilt 379 cruise control
