Exhaust Gas RECIRCULATION (EGR) Solenoid Valve: Inspection

Engine coolant temperature: 80~95°C (176~205°F)

1. Disconnect the vacuum hose from the throttle body EGR vacuum fitting and connect a hand vacuum pump to the fitting.
   Fig 1: Installing Vacuum Pump To EGR Solenoid Valve Fitting

   Courtesy of HYUNDAI MOTOR CO.
2. Start the engine and check to see that, after increasing the engine speed, vacuum raises proportionately to engine speed.
   NOTE: If there is a problem with the change in vacuum, it is possible that the throttle body port may be restricted and require cleaning.
   Fig 2: Vacuum VS. RPM Graph

   Courtesy of HYUNDAI MOTOR CO.