<VV> Leak Detecting...
rusecular at yahoo.com
Tue May 26 02:28:50 EDT 2009
"...An engine tuner once told us that 90 percent of all drivability
problems could be traced to vacuum leaks. If your street motor
is suffering from part-throttle hiccups or the lean-surge blues,
take a few minutes to search for a vacuum leak, first make
sure all the carb and intake-manifold bolts are tight.
Also make sure all the vacuum outlets on the engine are closed off
and that all vacuum lines are intact. It's common to discover a rubber
vacuum plug is missing or cracked. If everything is secure, start
the engine, warm it up, and shoot short squirts of WD-40 around
the intake and the carb and listen for a change in idle speed.
If you locate an area where the engine speed increases when you hit it
with WD-40, then you've found a vacuum leak. The engine speed
increases because the leak pulls the WD-40 into the engine and
burns it, temporarily increasing engine speed. This can make a
mess that will have to be cleaned, but it works to locate
hard-to-find vacuum leaks..."
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