EGR Function Testing Ford Festiva I

1989 Merkur & 1991-95 Escort/Tracer 1.9L (Ported EGR Valve)

1. Check vacuum lines for correct routing. Ensure no vacuum is available to EGR valve with engine idling. Disconnect idle air by-pass valve connector.
2. Disconnect vacuum hose at EGR valve and plug hose end. Connect a vacuum pump to EGR valve. Start engine. Apply 5-10 in. Hg to vacuum hose. If idle becomes unstable or engine stalls, EGR valve is functioning properly.
3. Reconnect idle air by-pass connector. Connect a vacuum pump to EGR vacuum supply hose. Ensure engine is at normal operating temperature. Increase engine speed 1500-2000 RPM. Vacuum gauge should read more than 5 in. Hg. If system operates as indicated, system is functioning properly.

1988-89 Festiva & Tracer (Ported EGR Valve)

1. Ensure engine is at normal operating temperature. Check vacuum lines for correct routing. Ensure no vacuum is available to EGR valve with engine idling. Start engine. Place finger against EGR diaphragm. Increase engine RPM. Diaphragm should move.
2. Remove EGR vacuum supply hose from EGR valve and plug hose end. Connect a vacuum pump to EGR valve. With engine idling, apply 6 in. Hg to EGR valve. If vacuum holds and idle becomes unstable or engine stalls, EGR valve is functioning properly.