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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 >> Opening Test

Opening Test

  1. With engine at operating temperature, rapidly open and close throttle (rev engine to at least 1500 RPM). A movement should be seen in the EGR diaphragm.
  2. If diaphragm does not move, probable causes are: faulty vacuum signal to EGR valve; defective EGR diaphragm or backpressure sensor diaphragm; vacuum leak.
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