Exc. 2.6L Engine
- With engine fully warmed up and idling in "P" or Neutral, abruptly open throttle to approximately 2000-3000 RPM. Visible movement of EGR valve stem should be noted. Repeat several times if necessary.
- 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.
- 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.