Editing Finding vacuum leaks
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{{youcanedit}} 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]]. =Propane method= #Get a soldering propane tank and valve attachment. #Unscrew the end of it so you have a threaded pipe without the nozzle. #Attach a 2 foot piece of hose to the end. #Start the engine and let it warm up a bit. #Turn on the propane and run the hose all around the vacuum lines and the bottom of the carb. #If the engine smooths out or revs up a bit, you have found your leak. Hold bottle UPRIGHT during testing as liquid propane may run out of an inverted bottle. PLEASE do this in a well ventilated area due to propane gas and exhaust fumes!! =Carburetor cleaner method= #With the car running, using a can of carburetor cleaner spray down the hoses and vacuum connections. #Notice a change in the running of the engine and you might have found your leak. [[Category:Engine]]
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