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 1 week 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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[–] empireOfLove2@lemmy.dbzer0.com 3 points 1 week ago

Another tip I've done for pinpointing vac leaks, the bodge job farmer way. If you don't have a smoke pen and don't want to go buy one, use some brake cleaner (non chlorinated) or starter fluid. Give it GENTLE TINY sprays around vacuum connections and components and see if the engine idle changes. An increase in idle means it's drawing the fluid in and burning it, aka a leak. Do it sparingly and wait a minute between sprays so you don't have a buildup of flammable vapors.

Incidentally this is a great way to also find bad spark plug wires...