67 250se coupe cold start solenoid - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 01-16-2005, 02:28 PM Thread Starter
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Date registered: Aug 2004
Vehicle: 67 250SE Coupe
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67 250se coupe cold start solenoid

Can anyone please help with my cold start solenoid? I need a wiring diagram to locate where the power comes from, to the solenoid.

i checked the switch(solenoid) with 12v and it clicks. also confirmed with engine running and engaged switch, engines blogs down with extra fuel injected. tested for power at wire when ignition key is turned to start. switch has a blip of power when key turned. i am not sure how long this stays open for the extra shot of gas. i am also not sure if switch opens in run and not start and for how long a duration. i dont know what tells the switch the engine is cold to allow function of cold switch.

wire runs from switch on the intake manifold and disappears into a bundle running along the firewall. not sure if it runs to a relay on the firewall or into the cabin.

Thanks in advance...........grez
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post #2 of 2 (permalink) Old 01-27-2005, 12:29 AM
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Date registered: Jan 2004
Vehicle: '03 SL500, '91 300SL, '91 500SL, '00 S500. '98 E320, '96 C220
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RE: 67 250se coupe cold start solenoid

I think you have a thermo-time switch in the side of the block which controls a relay which switches power to the start solenoid. If the layout is similar to an SL, this relay is among a group located just in front of the brake booster.
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