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Home >> Kia >> 2023 >> Carnival EX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control/Fuel System - General Information >> Troubleshooting >> Basic Troubleshooting >> Symptom Troubleshooting Guide Chart >> Poor idling
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Poor idling

Diagnostic procedure Additional check point
  1. Check the fuel pressure
  2. Check the Injector
  3. Check the long term fuel trim and short term fuel trim
  4. Check the idle speed control circuit (Check DTC)
  5. Inspect and test the Throttle Body
  6. Check the ECTS and circuit (Check DTC)
  • DTC
  • Low compression
  • Intake air leaks
  • Contaminated fuel
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