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Home >> Opel >> 1976 >> Opel Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> 1974 Models

1974 Models

  1. With engine at normal operating temperature, connect tachometer to engine and note idle RPM. Disconnect vacuum hose that goes to air cleaner at intake manifold.
  2. On non-California models, connect vacuum line from EGR valve to intake manifold fitting. On California models, leave regulating valve connected to intake manifold source but connect shut-off valve vacuum hose to intake manifold fitting.
  3. When hose is connected to intake manifold, idle speed should decrease by at least 200 RPM. If not, remove EGR valve and clean EGR valve and exhaust gas recirculation passage. Repeat test procedure. If idle still does not drop, replace EGR valve.
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