Exhaust Gas RECIRCULATION: Testing
- Check condition of all lines and connections. Start and run engine until normal operating temperature is reached. While observing EGR valve, open and close throttle several times.
- The EGR valve should open and close with RPM change, and close immediately when throttle is closed. Using a hand-held vacuum pump, apply vacuum to EGR valve. Valve diaphragm must retain vacuum when open. If not, clean or replace EGR valve as necessary.