Thread: Engine still running for 5-10 seconds after turn off ignition.
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Old 12-22-2010, 06:33 AM
Basstrip Basstrip is offline
Basstrip
  
Join Date: Dec 2008
Location: California
Posts: 111
relay location?
Where should I look for the relay? Do I hook up vacuuum gauge at the hose or at the shut off valve?
Quote:
Originally Posted by M.B.DOC View Post
The 1992-95 300SD (S350D) has an odd system for the vacuum shutoff.

Instead of direct vacuum like most other MB's, it used a relay that energized a switch-over valve that allowed vacuum to pull the shut-off diaphragm closed.

Had a few cars that that relay didn't send signal quickly to vacuum valve.

Testing is STILL done with a vacuum guage teed into the brown line at the pump.
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