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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. Movement should be noticed in 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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