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Home >> Mercury >> 1983 >> Capri Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Testing >> EGR Valves >> Ported EGR Valve
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Ported EGR Valve

  1. With engine cold there should be no vacuum to valve. If vacuum exists, check TVS or PVS function. At warm curb idle there should be no vacuum to valve.
  2. With engine warm, there should be vacuum to valve at 3000 RPM for 2.3L engines, and kickdown RPM on all other engines. If not, check vacuum lines, TVS and PVS and replace as required.
  3. With engine at idle, apply 8 in. Hg vacuum to valve. Valve stem should move, opening valve and idle should roughen. If stem moves but idle does not roughen, clean valve passages.
  4. With engine idling, apply 4 in. Hg vacuum to valve and trap. Vacuum should not drop more than 1 in. Hg in 30 seconds. If so, replace valve.
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