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Home >> Ford >> 1981 >> Courier 2.3L Eng VIN 2, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> EGR Valve Without BACKPRESSURE Transducer
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EGR Valve Without BACKPRESSURE Transducer

NOTE: This test applies only to EGR systems which DO NOT have backpressure transducer.
  1. Start and run engine to normal operating temperature (to be sure PVS is open).
  2. Check all vacuum hoses for proper condition and that they are tightly seated on connectors.
  3. Remove vacuum supply hose from EGR valve and plug hose. Attach another vacuum hose to EGR valve and attach a vacuum gauge to hose (preferably one calibrated in 1 in. Hg increments).
  4. Gradually apply 8 in. Hg to EGR valve and watch EGR valve stem. At idle, it should take no more than 1 in. Hg to cause stem to move (begin to open). If stem does not start to move, replace EGR valve.
  5. Turn engine off and apply 8" Hg to EGR valve and hold it. Vacuum should remain (within 1") for at least 30 seconds. If not, replace EGR valve.
  6. Restart engine and idle. Apply 8" Hg to EGR valve. Valve stem should move full length of travel and idle condition will get rough, RPM decrease and possibly stall. If not, EGR is not functioning and system is plugged. Clean as required.
  7. Reconnect all hoses to original (normal) positions, restart engine and idle at normal operating temperature. If idle is not acceptable, EGR valve may not be sealing.
  8. Install new gasket and adjust curb idle. Recheck idle condition. If no improvement, problem is elsewhere, reinstall original EGR valve and perform other engine diagnosis to seek out problem area.
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