Anybody know anything about 90’s vacuum controlled EGR systems? I’ve got one of those goofy little Japanese import trucks, and finding info about how it’s supposed to work is a nightmare.
There’s a pretty good vacuum leak out of the top of the vacuum amplifier/signal doodad. Kinda UFO shaped deal between the vacuum advance, intake manifold and the canister.
Any ideas on diagnosis, or ways I can figure out what’s doing what would be helpful.
A wax plug is truly insane. Parts for the emission system are pretty slim pickings, mostly just used off eBay. I think my bigger problem is the carb needs a rebuild something fierce. I have the carb kit and the time now so I should be able to tackle that soon. The fuel air mix screw has a little rubber washer in it that is pretty much gone so that can’t be helping any.
Pure Rube Goldberg… today it would be solenoids, temp sensors and the ECU powered up 24/7, which I guess is the advantage.
It also made a random robot-farting noise about 8 hours after cooling down which I believe was the evap purge canister venting. Gave me the heebie-jeebies a few times when I was out late at night, smoking a cigarette.