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Home >> Isuzu >> 1983 >> Impulse Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Component Testing >> EGR Valve >> I-Mark and P'UP
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I-Mark and P'UP

  1. Detach vacuum hose from EGR valve and connect 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 4.7 in. Hg (Fed. Man. Trans.) or 3.9 in. Hg (all others), stem should move diaphragm to full up position. If valve does not respond as indicated, EGR valve replacement is necessary.
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