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Home >> Jeep >> 1989 >> Wrangler Islander, 2.5 E >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Vacuum Transducer Test >> 2.5L & 4.0L Only

2.5L & 4.0L Only

  1. Disconnect transducer vacuum lines and (if applicable) backpressure line. Remove transducer.
  2. Plug transducer output port and apply 1-2 psi of regulated compressed air pressure to transducer backpressure port. See Figure . Apply a minimum of 12 in. Hg to transducer input port. Vacuum should hold. If not, replace vacuum transducer.
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