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Is there a 7 digit number on it, maybe starting with 323?
It's on your vacuum diagram, if you look at the right one. I assume you do not have your own copy of the '79 TSM. There is a digital copy on the Tom Collins site now. Look at page V-16 and forward. They call it a "VSD valve" for what I don't know (vacuum supply dump?) It's a dump valve - if there were anything about it in the TSM, it would be in Fuel System - EGR. The '82 TSM has a section about them.
When you say "clean up" do you mean remove a bunch of it or put it back the way it came from the factory? It looks fine to me ... study the manual and it will become less mysterious, and you'll have less trouble with the "clutter."
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
I think I'm going to take out the AIR system- not rip it out just remove it. Pre '81 emission test is just a probe in the tail pipe so I'm probably good without it.
I also want to look at things like the if the VSD was eliminated in later years I want to delete it as well.
I've not been one to rip out emissions stuff just because its emission stuff. But in the case of the FSJ i think simpler is better.
This confirms that I have the California emissions stuff. I have that VSD valve and the check valves. There is actually a 2nd check valve on that Tee'd off live of the VSD on mine.
