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Home >> Mitsubishi >> 2009 >> Lancer ES, Automatic CVT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (EGR Function Testing - CHRYSLER/MITSUBISHI) >> EGR Function Testing - CHRYSLER/MITSUBISHI >> Test 2 >> 1978-87 Carbureted (Dual EGR Valves)
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1978-87 Carbureted (Dual EGR Valves)

WARNING: This page is about a different variant/trim than selected.
  1. With engine cold, start engine and allow to idle. Observe sub-EGR valve and ensure it does not operate as engine speed is increased to 2500 RPM. If sub-EGR valve operates, thermovalve is defective.
  2. Allow engine to warm to normal operating temperature. Observe sub-EGR valve and ensure it does operate as engine speed is increased to 2500 RPM. If sub-EGR valve does not operate, sub-EGR valve or thermovalve is faulty.
  3. Disconnect Green-striped vacuum hose from carburetor nipple and attach a vacuum pump to hose. Manually pull on linkage of sub-EGR valve, and at same time apply 6 in. Hg. If idle becomes rough, main EGR valve is functioning properly.
  4. Connect a vacuum gauge to directly to carburetor nipple. Increase engine speed to about 3000 RPM. If vacuum is shown on gauge, system is functioning properly.
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