Humming noise from (I think) a throttle vacuum switch???

Discussion in 'General Motoring' started by Jamie, Jun 9, 2006.

  1. Jamie

    Jamie Guest

    On my 1987 740, I'm noticing a "hum", intermittently from what I think
    is a vacuum device. If you look at the cable spool attached to the
    throttle body, a cable on the end goes toward the firewall, through a
    diaphragm looking, black rubber 'thingy', and into the firewall. With
    your hand you can compress this device, as it is soft rubber.

    With the engine idling, every few seconds it hums then stops then hums
    then stops. Can this be repaired, replaced? What is it?

    Thanks!
     
    Jamie, Jun 9, 2006
    #1
  2. Jamie

    Jamie Guest

    I've been notified that this is probably the Cruise Control
    Servomechanism.

    Thanks.
     
    Jamie, Jun 9, 2006
    #2
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