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System Functional Check (Exc. 2.6L)

  1. With engine fully warmed up and idling in Park or Neutral, abruptly open throttle to approximately 2000-3000 RPM. Visible movement of EGR valve stem should be noted. Repeat several times if necessary.
  2. Attach hand vacuum pump to EGR valve with engine at idle. Apply at least 5 in. Hg vacuum and engine should run rough or stall.
  3. Attach vacuum gauge to EGR hose and open throttle quickly several times. A fluctuation of several in. Hg vacuum should be noted.
NOTE: V8 and 6-cylinder models incorporate electronic EGR control within the spark control computer.
  1. Check vacuum hose condition, routing and installation. Cold start and run engine at idle, then increase speed to 2500 RPM. Secondary EGR valve should NOT operate. If valve operates, replace thermo valve.
  2. Warm up engine to at least 150°F. Accelerate engine to 2500 RPM and note that secondary EGR valve DOES operate. If not, check EGR valve or thermo valve and replace as necessary.
  3. Disconnect green stripe hose from carburetor nipple and connect vacuum pump to hose. Pull sub EGR valve by hand and apply 6 in. Hg vacuum. If engine idling speed becomes unstable, valve is operating properly. If no change, check and replace EGR valve or thermo valve as required.
  4. Reconnect green stripe hose to carburetor and disconnect yellow stripe hose. Apply 6 in. Hg vacuum with hand pump. Engine idle should become unstable if primary valve is operating properly. If no change, check and replace EGR valve or thermo valve.
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