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| − | There are several methods for locating vacuum leaks. Occasionally, you may experience a vacuum leak into the intake ports from the crankcase of the motor due to the intake manifold / cylinder head interface not being machined parallel. No amount of propane or carburetor cleaner will find such a leak. The best way is to insure the elimination of such a problem while building the motor. See the wiki article: [[Manifold/Head vacuum leak, internal]].
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| − | =Propane method=
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| − | #Get a soldering propane tank and valve attachment.
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| − | #Unscrew the end of it so you have a threaded pipe without the nozzle.
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| − | #Attach a 2 foot piece of hose to the end.
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| − | #Start the engine and let it warm up a bit.
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| − | #Turn on the propane and run the hose all around the vacuum lines and the bottom of the carb.
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| − | #If the engine smooths out or revs up a bit, you have found your leak.
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| − | PLEASE do this in a well ventilated area due to propane gas and exhaust fumes!!
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| − | =Carburetor cleaner method=
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| − | #With the car running, using a can of carburetor cleaner spray down the hoses and vacuum connections.
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| − | #Notice a change in the running of the engine and you might have found your leak.
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| − | [[Category:Engine]]
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