limp mode started intermittently about 6 months ago on my 98.5 24v with an edge comp box. Assumed it to be the MAP sensor so I just unplugged the MAP sensor. Driven it this way for about 6 months with no issues.

This last week it has gone back into limp mode. The difference now is that in blows black smoke and gets up to 3-5psi boost. 'if I hammer down the throttle it will cut off the boost and blow smoke.

I have cleaned all the connector point from the comp to engine. When I plug the MAP sensor back in it still is in limp mode, without all the smoke.

any ideas?

 

sounds like the pump going south have you checked for codes?

 

codes from autozone

P1693-Tachometer circuit failure
P0237-Map sensor too high for too long
P0237-MAP sensor voltage too low
P0238-MAP sensor voltage too high

 

Have you tried replacing the MAP sensor? Use a GOOD one from Dodge or Cummins.
Also take the Edge out of the system until you find the problem, It could very well be the Edge that is causing it.