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Home >> Geo >> 1996 >> Metro Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 1.0 & 1.3L >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION >> EGR System Check

EGR System Check

  1. With engine cool, ensure EGR valve is not loose or broken. Replace if necessary. Start engine and warm to normal operating temperature.
    WARNING: Wear gloves while testing EGR valve to prevent injury from burns.
  2. Place finger on bottom of EGR valve diaphragm. Increase engine speed. Note if EGR valve diaphragm moves. If diaphragm does not move, allow engine to idle. Disconnect vacuum hose from EGR valve. See Fig 1. Apply 8 in. Hg of vacuum to EGR valve and place finger on diaphragm. Vacuum should hold, diaphragm should move and engine may stall. If EGR valve operation is as specified, go to next step. If EGR valve operation is not as specified, replace EGR valve.
  3. Check for carbon in valve which may cause a restriction. Restriction may be small enough so that engine may stall, but large enough to cause DTC P0400 to set. If EGR valve is okay, check EGR pressure transducer. If EGR valve is not okay, replace valve.
Fig 1: Identifying EGR System Components
G96I09863Courtesy of GENERAL MOTORS CORP.
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