Finding vacuum leaks

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 ==Vacuum gauge method (internal)==
-If the above methods fail to locate an external leak, the following procedure may be used to determine an internal leak.
+{{Note1}} See [http://www.crankshaftcoalition.com/wiki/Vacuum_gauge_engine_diagnosis '''Vacuum gauge engine diagnosis'''].
+The following procedure may be used to determine an internal leak:
 #Disconnect/remove the primary wire between the coil and distributor.
 #Adjust the idle screw so the throttle plate in the carburetor is completely closed.
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 #Connect vacuum gauge to a manifold vacuum source.
 #Have assistant crank engine while you read vacuum. If gauge reading is 0-2", you may have an internal leak between the manifold/head.
+{|
+|-align="top"
+|[[File:Vac2normal.gif|thumb|400px|Normal vacuum]]
+|[[File:Vac4vac leak.gif|thumb|400px|Vacuum leak]]
+|}
 =="Untraceable" vacuum leak==
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 [[Category:Engine]]
 [[Category:Carburetors]]
+{{Category:Troubleshooting]]
+[[Category:Good articles]]

Revision as of 11:51, 29 December 2012