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Registered
Join Date: Jul 2003
Location: Perfidious Albion
Posts: 4,184
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Looks like 911.617.117.00 "temperature switch" to me. Part #30 on PET diagram 103-05
Aka as TTS (Thermo Time Switch) in the CSV (cold start valve) circuit, causing it to add extra fuel while cranking (wired to the yellow wire on the starter solenoid) in cold conditions. Typically only does this for a few seconds - there's also an internal heater, which opens the circuit/removing the path to ground once it gets up to the temperature rating.
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'77 S with '78 930 power and a few other things.
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