Anyone know what the little switch/sensor does thats mounted on the firewall next to the battery terminal does? 86 325es.
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Firewall switch?
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It's only on eta and 318i models that had the seperate idle control module. It's an air temperature switch that closes below 32 F I assume as it feeds directly to the idle module that it changes the idle speed when it's real cold outside. The Green/yellow wire going to it should be a switched 12 volt source85 325e 2.7 ITB'd stroker
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