Exhaust Gas RECIRCULATION Valve (Optima & MAGENTIS (CANADIAN) 2.4L)

NOTE: For Exhaust Gas Recirculation (EGR) valve removal and installation, see EXHAUST GAS RECIRCULATION VALVE under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL & INSTALLATION article.

1. Connect vacuum pump to EGR valve fitting port. Apply vacuum to EGR valve and observe if vacuum is held. See Fig 1. If vacuum is held, go to next step. If vacuum is not held, replace EGR valve.
2. While vacuum pump is connected to EGR valve fitting port. Start engine and let it idle. Apply vacuum and observe for idle changes. If idle change is observe, EGR valve is operating properly. If no idle change is notice, turn engine off and go to next step.
3. Remove EGR valve, check for excessive carbon deposit. Connect vacuum pump to EGR valve fitting port. Apply vacuum and ensure EGR valve moves freely, blow air into exhaust pipe port, while vacuum is apply. See Fig 2. Air should go through and out intake port. While blowing air into exhaust pipe port, release vacuum and ensure no air passes through. If malfunction is found, repair or replace EGR valve as necessary.

Fig 1: Testing Exhaust Gas Recirculation Valve Vacuum Diaphragm (Optima & Magentis (Canadian) 2.4L)

Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Testing Exhaust Gas Recirculation Valve Operation (Optima & Magentis (Canadian) 2.4L)

Courtesy of KIA MOTORS AMERICA, INC.