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All Models (Ported EGR Valve)

  1. Check vacuum hose for correct routing. Disconnect vacuum hose from carburetor. Connect a hand-held vacuum pump to hose. Warm engine to normal operating temperature. With engine at idle speed, apply vacuum to EGR valve.
  2. If vacuum holds and idle becomes unstable or engine stalls, EGR valve is functioning properly. Reconnect hose to carburetor. Disconnect hose from EGR valve and connect a vacuum gauge to hose. Increase engine speed to about 3000 RPM. If vacuum is present on gauge, system is functioning properly.
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