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Checking for vacuum leaks-good methods 200 1986

posted by  Don Foster on  Sun Dec 15 00:21 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
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I wouldn't use starter fluid (ether). It's much, much too flammable and dangerous. WD-40 works fine, but is messy.

I like to use carb cleaner. It's not highly explosive, leaves no residue, and will wash crap off the engine as it dribbles away.

Another trick is to probe around with an UNLIT propane torch, aiming raw, unburned propane at suspicious locations. When the gas is inhaled through a vacuum leak, the engine smooths out.

As with ether, I feel this is dangerous.

A really good method to locate a leak is to use a 4-foot piece of clean fuel hose. Stick one end in your ear (hence the "clean" part) and probe around the engine with the other end. Use it as a stethoscope to locate a "hisssss."
--
Don Foster (near Cape Cod, MA)






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