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CARBURETED Models (Ported EGR Valve)

  1. Disconnect Green-striped hose from carburetor. Plug carburetor nipple. Connect a vacuum pump to disconnected vacuum hose. With engine coolant temperature at 113°F (45°C) or less, raise engine speed to 3500 RPM. Apply vacuum. Vacuum should bleed down.
  2. With engine coolant temperature at 185°F (85°C) or more and engine at idle, apply vacuum. Vacuum should bleed down. Raise engine speed to 3500 RPM. Apply vacuum. Vacuum should bleed down to about 3.2 in. Hg, then hold.
  3. Reconnect Green-striped hose to carburetor. Disconnect vacuum hose from EGR valve and connect a vacuum pump to EGR valve. With engine idling, apply vacuum. If vacuum holds and idle becomes unstable or engine stalls, EGR system is functioning properly.
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