EGR Valve & EGR Valve Position Sensor
The EGR valve with this system looks like standard EGR valves, but is air operated rather than vacuum operated. See Fig 2. Mounted on a spacer plate under the carburetor, the EGR valve has a built-in sensor which tells the ECA what the position of the EGR valve stem is. This valve and sensor assembly has no openings for maintenance or testing. If defective it must be replaced.