That is the TCS (transmission controlled spark) solenoid. The way it works is... it will allow vacuum advance only to operate in 3rd gear. It will also allow advance at certain engine temps as well... at start up when cold and also when very hot to help cool the engine down. If its all hooked up and working properly you will notice a slight drop in the fast idle during warm up when it reaches a certain temperature. The 3 prong temp switch in the front of the intake is part of the TCS system also.
|