Carburetor Tuning 201
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One thing the vacuum gauge is still good for is figuring out if you have the correct rated power valve. The power valve opens at wide open throttle when vacuum drops off and it is stamped as to what vacuum will open it. Run a manifold vacuum line inside the Jeep, and watch the A/F ratio gauge and the vacuum gauge at the same time (while someone else drives, of course). If the engine leans out before or after the valve's rating, change the valve. You should see a brief richening of the mixture near the rating of the power valve as it opens. View Related Article
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