Testing Ported EGR Valve on Honda Accord 1990-1993
- Run Accord engine to operating temperature and allowit to idle. Attach a vacuum gauge to EGR vacuum hose. Locate EGR vacuum solenoid.
- Using a jumper wire, ground signal wire from ECM to EGR vacuum solenoid. Vacuum should be present at EGR vacuum hose. On some models, engine speed may have to be increased 3000-4000 RPM.
- Connect a vacuum pump to EGR valve. Start Accord engine. Apply vacuum to EGR valve. If engine runs rough or stalls, and gauge holds vacuum, EGR valve is functioning properly.
