markjs Posted January 19, 2006 Share Posted January 19, 2006 I got two vaccum switches up near the firewall on the passenger side that used to be connected. Car runs fine without them, but someone told me that on of them helps the timing advance under certain conditions....... I'd like to know what they are for, and what they should be connected to, if anything....? Link to comment Share on other sites More sharing options...
idosubaru Posted January 19, 2006 Share Posted January 19, 2006 what vehicle, engine, transmission, year, Link to comment Share on other sites More sharing options...
markjs Posted January 19, 2006 Author Share Posted January 19, 2006 Sorry, it's an '84 GL Wagon FWD, 1800CC Carter/Weber carb, 5 speed manual. I didn't get much sleep LOL Link to comment Share on other sites More sharing options...
NoahDL88 Posted January 19, 2006 Share Posted January 19, 2006 It could be for your vent settings, the mix and blend doors are operated by vacuume, so without them it may be stuck on "not defrost" which in Washington is rather important. Link to comment Share on other sites More sharing options...
naru Posted January 19, 2006 Share Posted January 19, 2006 I got two vaccum switches up near the firewall on the passenger side that used to be connected. Car runs fine without them, but someone told me that on of them helps the timing advance under certain conditions....... I'd like to know what they are for, and what they should be connected to, if anything....? The vacuum switches don`t have anything to do with timing.There is a thermosensor that does though. They should both be hooked to manifold vacuum.Between them,the two switches act like a primitive map sensor w/two different trigger points. Switch #1 tells the ECU to ignore the O2 sensor under certain conditions. Switch #2 tells the ECU to respond more quickly To the O2 sensor under certain conditions. Link to comment Share on other sites More sharing options...
markjs Posted January 20, 2006 Author Share Posted January 20, 2006 Well that's just weird! My car lacks an O2 sensor and does not even have a hole to mount one in, yet, there are two vaccum switches for it and the ECS light shows the code for O2 sensor.....Well I prolly needn't wonder. Link to comment Share on other sites More sharing options...
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