Editing 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 aroung 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]]