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Home >> Kia >> 2017 >> Optima EX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (EGR Function Testing - KIA) >> EGR Function Testing - KIA >> Test 2 >> 2.4L & 3.5L

2.4L & 3.5L

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  1. Connect vacuum pump to EGR valve fitting port. Apply vacuum to EGR valve and observe if vacuum is held. 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 and operate engine at 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. 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. To check EGR control solenoid, see EGR CONTROL SOLENOID.
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