tjhayes1 Posted July 1, 2020 Share Posted July 1, 2020 I've looked through the FSM, my Haynes manual and searched forums on multiple sites. I can't identify this part on top of the thermostat housing and where the hoses are supposed to be attached. Any help is appreciated. Thanks! Quote Link to comment Share on other sites More sharing options...
Roberts280Z Posted July 1, 2020 Share Posted July 1, 2020 I think this is a vacuum solenoid, used to interrupt the vacuum to the vacuum advance on the distributor. The vacuum line on the right of your picture goes to the vacuum canister, via a T fitting that would be in the lower left of your picture. The unconnected fitting goes to your vacuum advance on the distributor. I can't find any direct discussion of this in the FSM, but I've looked at mine, and at related items in the FSM, where it is described (I think) as a 'vacuum switch solenoid', or 'vacuum cuiting solenoid', and is used in M/T non-CA models. Quote Link to comment Share on other sites More sharing options...
NewZed Posted July 1, 2020 Share Posted July 1, 2020 Roberts280Z is correct. It's energized by the top gear switch. For some reason, maybe emissions or knocking reasons, Nissan did not want the vacuum advance to work in the lower three gears. Quote Link to comment Share on other sites More sharing options...
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