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.
For vacuum leak? I usually 1)look for any visible wear on all the hose and vacuum stuff 2)listen to the hissing and find out where, or 3) get a can of throttle body cleaner and start spraying on place i suspect there’s a vacuum leak. If the timing drop then there’s leak there.