I was replacing the vacum hose on my 93 W250 today, from the brake booster to the speed control servo. I was also going to replace the vacum hose to the drivers quarter panel mounted "gizmo". Where the hose branches at a 3 way tee connection - from the brake booster to the servo, then to the brake booster tee to a "gizmo" mounted on the drivers side quarter panel (which has an electrical connection plug on it). Anyways, the plastic male vacum hose end on the "gizmo" broke. Soooo, now I need to replace this "gizmo." What's this "gizmo" called? Is it an idle air control module? I searched the fsm, but couldn't locate a match.

 

Sounds like the low vacuum sensor. You don't want to replace it, just fix it.

https://www.dieseltruckresource.com/...ghlight=mig%2A

 

Dave,
Thanks for the forum link to the mig tip fix for the low vacum sensor! That's a nifty way of fixing the broken male vacum nipple. I will probably just plug the vacum hose to the sensor, until I get around to the mig tip fix