I have a 2008 F450 6.4. I blew a turbo boot while pulling our big trailer. It got real hot fast and burnt down the motor. Three cylinders scored and two cracked heads. After, while checking things it would not show boost. I had the motor rebuilt and is back in and sound great but still doesn't show any boost. I replaced the map/iat1 sensor and the exhaust pressure sensor, still nothing. I drove it and it doesn't seem like it has any boost. The turbo's were rebuilt too. I have deleted the egr and the dps a long time ago.
What am I missing?


Thank you
Melvin R Dennis

 

do you have a cat and dpf

if you do, disconnect the exhaust down pipe before the cat and re-check it.

if you get boost , either your cat or dpf is clogged

 

Something to consider, Boost is usually a calculated value based upon Manifold Absolute Pressure Sensor.

 

Also, MAF and MAP are different sensors.