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Home >> Geo >> 1991 >> Metro XFi >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emissions Systems & Sub-Systems >> Exhaust Gas RECIRCULATION System >> EGR Modulator
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EGR Modulator

  1. Remove EGR modulator. Plug one upper vacuum hose fitting while blowing air into remaining upper vacuum hose fitting. Air should pass through the filter.
  2. Connect vacuum pump to one of the upper vacuum hose fittings. Plug remaining upper vacuum hose fitting (exhaust gas pressure port). Blow air into the bottom vacuum hose fitting, while applying vacuum with vacuum pump. Vacuum should be obtained. Replace EGR modulator if defective.
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