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Exhaust Gas RECIRCULATION: Testing

  1. Warm engine to normal operating temperature. Connect tachometer to engine. Increase engine RPM. Check that EGR valve opens at 1900 RPM on Turbo models or 2600 RPM on Non-Turbo models.
  2. Return engine to idle. Disconnect EGR hose at thermal vacuum valve. Create a vacuum in the EGR valve using a vacuum pump or by sucking on the hose. Engine should run rough or stall. If not, replace valve.
  3. Disconnect hoses from EGR valve and throttle housing vacuum port(s). Blow through hoses. Air should not pass when engine is cold, but should pass with engine warm.
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