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1983-84 Pulse-Width Modulated EGR Valve

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  1. Check vacuum lines for leaks and electrical connectors for proper installation. Place transmission in Park or Neutral. With engine idling at normal operating temperature, push up on underside of EGR valve diaphragm. Engine RPM should drop. If engine RPM does not drop, clean EGR valve and passages.
  2. Check for EGR valve diaphragm movement with engine RPM decreasing from 2000 RPM to idle. EGR valve diaphragm should not move. If EGR valve diaphragm moves with RPM change, check Park/Neutral switch for open circuit or misadjustment. If EGR valve diaphragm does not move, disconnect ALDL test connector and ground test terminal. If EGR valve diaphragm moves, EGR valve is functioning properly.
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