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Home >> Mercury >> 1976 >> Capri II Base, 2.3L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION (EGR) System (CAPRI II) >> Testing >> EGR System
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EGR System

  1. Check all vacuum hoses to make sure they are in good condition. Remove EGR vacuum supply hose from EGR valve and install a vacuum hose from EGR valve to a hand-held vacuum pump and gauge. Start engine and stabilize temperature.
  2. Gradually apply vacuum to EGR valve, while observing movement of EGR valve stem. Valve stem should be seen to move at 1 in. Hg. If valve does not start to open, it must be replaced. With engine off, apply 8 in. Hg to EGR valve. Vacuum should hold for a minimum of 30 seconds. If not, replace EGR valve.
  3. With engine at idle, apply at least 8 in. Hg to EGR valve. Valve stem should move to full extent of its travel. Engine should run rough or stall. If not, there is something plugging EGR system. Clean system and repeat test.
  4. Restart engine and stabilize temperature. If engine idles roughly, EGR valve may not be sealing properly. Install a new EGR valve and gasket. Recheck idle condition. If there is no improvement, problem is elsewhere, reinstall original EGR valve and check other components.
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