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1970-73 All Models (Ported EGR Valve)

  1. Ensure engine is at normal operating temperature. Disconnect vacuum hose at EGR valve. Connect a hand-held vacuum pump to EGR valve. Start engine. Apply vacuum to EGR valve. If engine runs rough or stalls, and EGR valve holds vacuum, EGR valve is functioning properly.
  2. Connect a vacuum gauge to EGR hose. Increase engine speed to about 3000 RPM. If vacuum is shown on gauge, system is functioning properly.
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