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Home › Isuzu › 1990 › Impulse Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests - EFI › Emission Systems & Sub-Systems › Exhaust Gas RECIRCULATION › EGR Valve

EGR Valve

  1. Using a vacuum pump, apply vacuum to EGR valve diaphragm. EGR valve diaphragm should hold vacuum. Check that vacuum does not leak down and EGR valve diaphragm moves to a fully open position.
  2. Inspect EGR valve diaphragm for cracking. Check valve and seat for deformation and carbon deposits. Replace EGR valve if defective.
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