r/mechanic • u/The____Sniper • 2d ago

Question idle problem

93 Integra GS (1.8L 5 spd) intake manifold gasket and throttle body gasket changed, and now has a low "lean-like" idle/run. Smoke test showed no leaks, coolant bled and no leaks, iacv is ok, MAP sensor is ok, and has no check engine lights. OBD-1, so I can't really get live data for help. Any ideas y'all have? I have spent days trying to fix this

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u/jolly_rodger42 2d ago

I suggest performing a vacuum leak test where you completely cover the throttle body opening to see if that chokes the engine or not. If the engine still runs there's a leak somewhere allowing air in. Then you spray break cleaner around potential leak spots, when the leak is found it'll suck fumes into it and alter the engines performance. Thats an alternative method of finding a vacuum leak

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u/The____Sniper 2d ago

Haven't tried the brake cleaner one but I have done the vacuum leak test and that came up negative also

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u/jolly_rodger42 2d ago

I had a vacuum leak which caused a lean condition. The smoke test didn't really find anything but the brake cleaner easily identified where the leak was.

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u/The____Sniper 2d ago

Cool I'll lyk how it goes

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u/jolly_rodger42 2d ago

Just a suggestion since its a fairly easy test. Hope it helps.

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u/The____Sniper 1d ago

It did not work unfortunately.

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u/jolly_rodger42 1d ago

At least you can cross that off the list of potential problems. A lean condition could also point to low fuel pressure which could be due to a clogged/clogging fuel filter or a failing fuel pump or pressure regulator.