Finding vacuum leaks

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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]].
+=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.
+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]]

Revision as of 18:07, 16 December 2008