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Home >> Jeep >> 1981 >> Cherokee Base, 2D Utility, 4.2L Eng VIN C, 4WD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> Valve Opening Test
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Valve Opening Test

  1. With engine at normal operating temperature and at curb idle, rapidly open and close throttle (open throttle sufficiently to obtain at least 1500 RPM). A definite movement should be noticed in the EGR diaphragm.
  2. If diaphragm does not move, probable causes are: faulty vacuum signal to EGR; defective EGR diaphragm or defective back-pressure sensor diaphragm (if equipped); or leaks in vacuum lines or connections.
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