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

tomghannon

Member
Joined
Oct 10, 2010
Messages
41
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
 

kevin747

New Member
Joined
Mar 28, 2008
Messages
14
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
 

Users who are viewing this thread

Top Bottom