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Home >> American Motors >> 1978 >> Gremlin Base, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> EGR System >> Testing >> EGR Valve >> Closing Test

Closing Test

  1. With engine at normal operating temperature, manually depress EGR valve diaphragm. This should cause an immediate drop in engine speed.
  2. If not, passage between EGR valve and manifold may be plugged. If engine idles rough and is not affected by depressing diaphragm, fault is in hoses or EGR valve.
  3. If engine idles properly but there is no change in RPM when valve is depressed, exhaust gases are not reaching the combustion chamber. Check for a plugged passage between the EGR valve and the intake manifold.
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