Hello,

My 1994 c220 vacuum pump has an electrical short, so I have to remove its fuse. I would like to know whether the vacuum system that is controlled by the vacuum pump has anything to do with the other vacuum system that is used for engine management or emission control.

My car recently has shown codes for O2 sensors and MAF (the symtoms are frequent stallings at idle). I have replaced the two O2 sensors and cleaned the MAF's hot-film element with non-chlorinated brake cleaner. After that, no code is shown but the stalling still persists. I'm afraid that the lack of the vacuum pump's vacuum system may play a role?

FYI, the OVP is of the new type and the wiring harness is good.

Thanks a lot for your help.

Best regards,

Eric