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Vacuum Amplifier

  1. Remove air cleaner and disconnect vacuum line from thermo valve (vacuum amplifier-to-EGR solenoid line from solenoid valve on Calif. B2000). Connect vacuum gauge to disconnected hose. Run engine at idle and disconnect vacuum amplifier-to-carburetor vacuum line at carburetor. Gauge reading should be 1.6-2.4 in. Hg on 626 models and 1.8-2.2 in. Hg on all other models.
  2. Slowly increase engine speed to 3500 RPM. Gauge should read 3.6 in. Hg. If vacuum amplifier does not respond as outlined, replace vacuum amplifier.
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