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Electronic EGR Valve

NOTE: Electronic EGR valve system is controlled by the EEC system. This article covers testing of EGR valve only. See appropriate article in the COMPUTERIZED ENGINE CONTROL section for testing of EVP sensor and Electronic Vacuum Regulator.
  1. Check vacuum lines for correct routing. Disconnect vacuum hose at valve and connect vacuum gauge to hose. Disconnect connector at EVP on top of EGR valve.
  2. Start engine and apply 8 in. Hg (27.2 kPa) of vacuum with engine idling. Engine idle should become rough or stall. If idle did not drop, remove valve and check for plugged inlet or outlet ports. Clean ports if they are plugged. Replace valve if inlet or outlet ports are not plugged.
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