thedoctor Posted April 25, 2012 Share Posted April 25, 2012 In preparing to install the intake manifold on ea81, noticed this broken piece. Is it a vacuum valve or something? I have to find a replacement STAT. Link to comment Share on other sites More sharing options...
TheLoyale Posted April 25, 2012 Share Posted April 25, 2012 I'm usually pretty good at playing the random part identification game, but this one is a tuffy. I would also like to know what this is! I'm sure someone has one as well. -Tom Link to comment Share on other sites More sharing options...
thedoctor Posted April 25, 2012 Author Share Posted April 25, 2012 These are vacuum lines right? Link to comment Share on other sites More sharing options...
FlatFourFrenchy Posted April 25, 2012 Share Posted April 25, 2012 It appears to be a thermal vaccum switch. It looks like the ones GM used during the smogged late carbed models. Link to comment Share on other sites More sharing options...
TheLoyale Posted April 25, 2012 Share Posted April 25, 2012 What year is this motor? My '83 EA81 doesn't have this, that I can remember. Link to comment Share on other sites More sharing options...
thedoctor Posted April 25, 2012 Author Share Posted April 25, 2012 This is a 1983 dl ea81 Is there is any chance I don't need this piece? Link to comment Share on other sites More sharing options...
92_rugby_subie Posted April 25, 2012 Share Posted April 25, 2012 You sure its an EA81? My 84 DL was a EA71... until GD and I swapped it. Link to comment Share on other sites More sharing options...
thedoctor Posted April 25, 2012 Author Share Posted April 25, 2012 EA81 is stamped on the block. I have a single barrel Carter-Weber carb. And the vehicle is front wheel drive. Link to comment Share on other sites More sharing options...
skingry Posted April 25, 2012 Share Posted April 25, 2012 (edited) It's the "Thermo Vacuum Valve I"... it's used to reroute throttle plate vacuum that normally goes to the distributor, EGR valve, and vapor canister to the air cleaner (ie. the valve modulates the vacuum pressure between manifold levels and atmosphere levels when it's activated). The valve is only activated when the coolant is between a certain temperature range (which I think is something like 58F to 98F)... so, it's pretty much useless, because the amount of time your engine coolant is normally going be in that range is probably between 30 seconds and 2 minutes (depending on ambient temp). I've bypassed it all together on my CA setup EA81. PM me if you want a copy of the pages from the FSM outlining it (if you're super curious and dying to look at vacuum schematics). Edited April 25, 2012 by skingry Link to comment Share on other sites More sharing options...
thedoctor Posted April 27, 2012 Author Share Posted April 27, 2012 (edited) ? Edited April 27, 2012 by thedoctor Link to comment Share on other sites More sharing options...
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