Fixing Holley Power Valve Hiccups
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Note that you can see the spring loaded valve (arrow) in the cut-out portion of the tester. This way, you can use a running engine as a vacuum source. If the spring-loaded valve stays retracted (up), the valve is good. If the valve stays down, the power valve is bad and should be discarded. We’ve discovered that even new power valves are sometimes bad, so be sure to test your new valve as well. When using any tester, make sure it works properly. If you test 10 valves and they’re all “bad,” suspect that your tester has a leak. View Related Article
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