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Vacuum Amplifier

  1. Check for adequate manifold vacuum. With engine idling at normal operating temperature, connect a hand-held vacuum pump to hose on vacuum amplifier leading to venturi port on carburetor. Apply approximately 2 in. Hg.
  2. Disconnect hose to EGR delay timer (if equipped). EGR valve should open and engine speed should drop at least 150 RPM. If engine speed does not drop 150 RPM, replace vacuum amplifier.
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