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1979 Corolla

  1. Using "T" fitting, connect vacuum gauge between intake manifold and vacuum control valve. See Figure. With engine at idle, pinch off vacuum hose between control valve and delay valve. Check that throttle positioner is at idle position when vacuum is below 22 in. Hg.
  2. Press accelerator to full open position and quickly release it. Check that throttle positioner is activated when vacuum is above 23 in. Hg. If throttle positioner does not operate as described, vacuum control valve is defective and should be replaced.
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