1996 f 450 . What is the fuction of the MAP sensor unit and how can I run with it unpluged any harm done thanks RAY 450

 

"MAP: Manifold Absolute Pressure sensor Strategy and feedback input; The PCM monitors manifold pressure to control fuel delivery in order to minimize smoke. It also optimizes injection timing for detected boost. It also monitor boost to limit fuel delivery to control maximum turbo boost. Frequency output; 111Hz=14.7psi, 130Hz=20psi, 167Hz=30psi. PID: MAP (pressure basline 14.7psi), MAP HZ (frequency), MGP Manifold Gauge Pressure (pressure base line 0psi) turbo boost "

pretty much what is does is tells the computer how much boost the turbo is putting out and tells the computer about it so it can fuel based on boost pressure among other things. When you unplug it the PCM will use generic values to replace the actual value. You can leave it unplugged but you will not get perfect performance out of it. I would not do this for an extended period of time. a few days would be ok.

 

Like TJ says, it's OK to run it with the electrical connector unplugged but you need to leave the rubber hose on there or you will be loosing boost from the turbo.
Why do you want to do this?