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Power Valves?
How can you tell if the power valve in your carb. is blown? Does it run rich at an idle? Is there a way to test it out of the carb.?
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Take it out of the metering block and suck on it. If the plunger goes in and out it's OK....
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Jack's right...........
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Quote:
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Thanks guys, I will take it out today and test it, but what are the symptoms of a blown one while the car is running?
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I have never been able to get a carb to hold a tune with a blown power valve. If you had a backfire, and are chasing an even idle, I have always found it was a blown valve. As others have said, it is a cheap part. There is also a way to put a "ball bearing" in as a check valve to keep the power valve from blowing out during backfires.
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When a power valve "blows", it's always open, causing a rough idle because of the extra fuel. The engine will run fine at other times. I've tried sucking on them as a test without success personally, so I'm resigned to replacing them if the idle is as described. Oh, by the way, a catalitic convertor will turn a nice cherry red because of the extra fuel. Spectre makes a power valve saver for around $10 or so, and Holley sells a 2-pack for around same price, although the Spectre unit is just a bit easier to install.
Dan |
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