W124 300D OM603 Engine - Diagnosis of Faulty Vacuum Shut-off valve

Discussion in 'Engine' started by tomghannon, Aug 30, 2011.

  1. tomghannon

    tomghannon Member

    Messages:
    41
    Joined:
    Oct 10, 2010
    Location:
    Co. Clare, Ireland
    Car:
    1992 W124 300TD, 2001 W210 E320CDI
    Hi All,

    Following on from an earlier thread regarding problems switching off my 300TD, it appears that either the shut-off valve is faulty or there is an intake of air somewhere in the vacuum system leading from the ignition switch.

    Can anyone give me a few general pointers on how to properly diagnose and repair - my mechanic cant take the car until next week and I am growing a little weary of popping the bonnet every time I want to turn off the engine :eek:

    Thanks
     
  2. kevin747

    kevin747 New Member

    Messages:
    14
    Joined:
    Mar 28, 2008
    hi i think the vacuum system may have a leak
    try to put headlights on and use headlight roll switch (by the light switch)
    to see if lights go up and down , if not listen at the roll switch for hissing
    and also look under bonnet for yellow one way valves that can leak vacuum
    fix the leak and fix the turning off problem
     

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