EGR Vacuum Circuit
- Disconnect wire 146 from electrovalve. Connect a jumper wire in place of it on electrovalve. Connect other end of jumper wire to ground.
- Start the engine. There should be vacuum at the vacuum converter and electrovalve should be open. Disconnect link-rod from vacuum converter lever.
- With engine idling, move converter lever smoothly in direction of acceleration for injection pump lever.
- Diaphragm of EGR valve should move smoothly until the EGR valve closes completely. If not, complete the following vacuum checks.