Finding vacuum leaks
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| + | ==Initial Diagnosis== | ||
| + | If you suspect a vacuum leak you may be able to verify your suspicion by performing a simple check. With the air cleaner removed (carbureted engine) and the engine at idle speed, place a wadded-up rag over the carburator throat to choke off the air supply. If the engine rpm speeds up, chances are you have a vacuum leak. | ||
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 engine. See [[Manifold/Head vacuum leak, internal]]. | 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 engine. See [[Manifold/Head vacuum leak, internal]]. | ||
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