After having a discussion with another poster off forum I thought I'd better mention this. The vacuum for advance to your ignition distributor on a stock D is cut off at idle by the idle speed switch. This is done by a normally open solenoid valve which closes when powered on at idle. This a three-way solenoid valve. Three-ways exhaust one port out the top when not active. Thats what that little cap is for on top of the solenoid, it's where the atmospheric pressure comes in to equalize the vacuum in the distributor. (Three-ways used in vacuum applications usually have a filter there to keep dirt from being sucked into the valve and whatever device it's controlling.) This means it's imperative the vacuum plumbing to this solenoid is correct. If you plumb it backwards you'll trap vacuum in your advance and also have an open path through the solenoid exhaust port to the intake manifold when the solenoid is activated at idle. Pay careful attention to the vacuum plumbing schematic because the ports are not marked on the part itself. The solenoid port closest to the electrcial connector must go to the intake manifold and the port farthest away must go to the distributor. Don't ever treat it as a simple two-way solenoid, in which case the plumbing would not matter. Get it wrong and you'll have problems. Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=251812.3170658.4537139.1261774/D=egroupweb/S=170512 6215:HM/A=1693352/R=0/SIG=11tralmvc/*http://www.netflix.com/Default?mqso=6 0178293&partid=3170658> click here <http://us.adserver.yahoo.com/l?M=251812.3170658.4537139.1261774/D=egroupm ail/S=:HM/A=1693352/rand=782610710> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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