Originally posted by JimSmith
The older W123 series cars ... In this system, the vacuum also is used to shut the fuel supply to the engine off when you turn the engine off with the key. ... So, a not so unpopular solution for cheapskates like me is to disconnect the door lock system and plug the lines to restore the functionality of the key shut off device.
Heh.. Interesting stuff Jim, I never knew this was the case with W123s - Neat engineering! (And end-user engeering by you..!)
brewtoo - perhaps you can disable the trunk's's 'unlock and disable alarm' switch (unplugging the electrical connection, probably) and then try the door one(s) individually. This should be the easiest way to diagnose the problem, provided there is no system technicalities that make this un-feasable.