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Home >> Opel >> 1974 >> Manta Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> 1979 Models
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1979 Models

  1. Detach vacuum hose from EGR valve and connect an outside vacuum source, such as hand pump with gauge. Apply about 4 in. Hg and hold this level. Vacuum should not leak down.
  2. While applying vacuum, watch movement of valve stem. At 4-5 in. Hg, stem should move diaphragm to full up position. If valve does not respond as indicated, it must be replaced.
Fig 1: 1974 EGR System (California)
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