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.
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.