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Home >> Kia >> 2023 >> Carnival EX >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Engine Control/Fuel System - General Information) >> Troubleshooting >> Basic Troubleshooting >> Symptom Troubleshooting Guide Chart >> Poor idling

Poor idling

WARNING: This page is about a different car, the 2024 Kia Carnival. However, it is still accessible from the selected car via links, so may be relevant.
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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