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Feedback Vacuum Control Not Within Limits

  1. Disconnect manifold vacuum input hose from Vacuum Solenoid Regulator (VSR) and connect vacuum gauge to hose.
  2. Start and run engine at idle. Ensure that throttle is fast idle cam and note vacuum gauge reading. If reading is less than 12 in. Hg, check for leak in vacuum hose. Repair and retest. If reading is greater than 12 in. Hg, go to next step.
  3. Reconnect manifold vacuum input hose to VSR. Disconnect vacuum control hose from carburetor and connect vacuum gauge to it. If average vacuum reading is less than 1.75" or more than 3.25 in. Hg, replace VSR and retest. If average vacuum is between 1.75-3.25 in. Hg, check CARBURETOR FEEDBACK DIAPHRAGM ASSEMBLY and retest.
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