Have you tried removing the brake wire input at the oem ecm connector and then see if the high idle works? If it does then the input is grounded....
I would look at the wiring harness a bit closer. Do the 10lb pull test on each wire. If that's OK. Remove the ecm plug and load test the circuit...
It will be under the cab on the drivers side.
The mxs doesn't have different washers for the Jakes. If you had a platinum kit installed at a dealer they should have checked for any rocker arm...
Use some soapy water to confirm where the leak is.
The freightliners came with a catalytic converter exhaust after 02. I think the exhaust restriction was about 60" of h2o. I have seen guys just...
You should be getting 50psi. I would fix your exhaust issue first. If your boost is still low. I would confirm your air cleaners are good....
Is your engine a twin turbo? Bxs or mxs serial number? If it is your boost should be closer to 50 psi.
You would need to check the test spec number from each ecm. Then compare the numbers on the cat site to compare the iron differences. If that's...
It is possible to be plugged. Best way to confirm is to perform an exhaust restriction test.
