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16Volt's Avatar
Join Date: Oct 2013
Location: Seattle, WA
Posts: 987
Identify this connector (at distributor)

Sorry for all the new guy posts -

So I was poking around under the hood and found this connector unplugged, any ideas? Looks to me like its ignition related or maybe this the o2 sensor connector?

20140119_205902 by thecrashingdoor, on Flickr

20140119_205837 by thecrashingdoor, on Flickr

Interesting it has a Mercedes stamp on it. Thanks folks.
- 86 Porsche 930 - Mr.Hyde
- 86 BMW 635CSi - Dr.Jeykell
- 2006 Infiniti M45 Sport
Old 01-19-2014, 09:23 PM
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
They used to be plugged into vacuum switches that were part of emissions controls. One operated the diverter valves in the air pump system and the other blocked the vacuum retard line to the distributor to advance timing and help raise idle speed a few hundred rpms for a minute or two after a cold start.

The red vacuum line is for vacuum retard and the blue one is vacuum advance/boost retard on the distributor.
The red one looks a little beat up from people wrenching on the 13mm nut below it while adjusting ignition timing. Those vacuum lines are really old now and with the colored fabric over the rubber hose you can't see if they are dry rotted, cracked, or broken underneath and they should be replaced.
Old 01-19-2014, 09:55 PM
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