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Home >> Ford >> 1989 >> Probe GL, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Vacuum Control >> EGR Valve/BACKPRESSURE Transducer Assembly
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EGR Valve/BACKPRESSURE Transducer Assembly

  1. Check vacuum hose routing. Disconnect EGR valve hose and connect vacuum gauge to hose. With engine warm, there should be vacuum to valve at 2000-3000 RPM. If vacuum does not exist, check vacuum lines from EGR to source.
  2. Clamp a plug (freeze plug may be used) into end of tailpipe, about 1/16" less than I.D. Connect vacuum pump to EGR valve. DO NOT disconnect transducer from EGR valve.
  3. Idle engine and gradually apply 6-10 in. Hg. EGR valve stem/diaphragm should move smoothly and engine should drop at least 100 RPM.
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