this post was submitted on 13 Oct 2025
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Mechanic Advice

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90's EGR Systems (lemmy.world)
submitted 4 months ago by Fuckfuckmyfuckingass@lemmy.world to c/mechanicadvice@lemmy.world
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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.

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[–] psx_crab@lemmy.zip 2 points 4 months ago* (last edited 4 months ago)

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.