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Vacuum Control Valve

  1. Ensure all vacuum hoses are in good condition and properly routed. Disconnect intake manifold vacuum hose from anti-afterburn valve or air by-pass valve at "T" fitting and plug hose. Attach vacuum gauge to "T" fitting.
  2. Start engine and raise engine speed to 3000 RPM. Quickly release throttle while observing vacuum gauge. If vacuum control valve is functioning properly, gauge should reach highest reading shortly after releasing throttle, then drop to 22.4 in. Hg for a few seconds before dropping to a normal vacuum reading.
  3. If reading is not within specifications, loosen locking screw and turn vacuum control valve adjusting screw until proper reading is obtained. Tighten locking screw and return all hoses to original positions.
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