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Home >> Mazda >> 1984 >> GLC 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Component Testing >> EGR THERMO Valve
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EGR THERMO Valve

  1. With engine at operating temperature and idling, disconnect the vacuum hose from EGR valve. Apply manifold vacuum to EGR valve. Engine should idle rough or stall.
  2. If engine does not respond as described, remove thermo valve and check operation of valve opening. Valve should start to open at 104°F (40°C) and open completely at 158° (70°C).
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