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Start engine. Listen for a hissing noise. Take a can of carburetor cleaner and spray onto all suspected leaking areas. Spray short sweeping sprays, careful not to spray onto hot exhaust or ignition parts. If idle improves or rpm raises when you are spraying a certain area, you are close. Try to pinpoint a gasket or vacuum hose. You will notice a improvement in idle when sprayed directly on leaking part. Replace gasket or hose.

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โˆ™ 2006-03-12 05:35:14
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Q: How to fix a manifold vacuum leak in a 1994 Honda Civic DX?
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