Exhaust Gas RECIRCULATION (EGR) System: Testing

1. Check condition of all lines and connections. Start engine and run until normal operating temperature is reached.
2. While watching 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.
3. Using a hand operated vacuum pump, apply vacuum to EGR valve. Valve diaphragm must retain vacuum when open. If not, clean or replace EGR valve as necessary.

Fig 1: Triumph TR8 Exhaust Gas Recirculation

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