Hello everyone! I believe my air pump is going south as evidenced by a loud screeching sound that comes around for about 30-40 seconds after I start up the car. It sounds like a turbine spooling up actually, except really high pitched. I was wondering if anybody knows how the ECU tells the air pump to turn on and if it were possible to just cut this wire and not have the pump activate? I have a 1992 300E with old school Cis-E, so I don't have to worry about the car spitting out error codes or even a check engine light...Thanks!