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Home >> Mercury >> 1980 >> Bobcat Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION (EGR) System >> Testing >> Carburetor EGR Ports

Carburetor EGR Ports

  1. Attach a vacuum gauge directly to EGR source on carburetor. With engine running, open throttle quickly to at least 1/2 open position. Avoid overspeeding engine.
  2. Observe vacuum gauge for a quick rise and fall as throttle is opened and closed. If vacuum is evident, EGR port is open. If no vacuum is evident, EGR port in carburetor is plugged or restricted and should be cleaned.
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