2024 Kia Niro Plug-In Hybrid EXFACTORY OEM SERVICE PROCEDURE

Unstable Idling

Inspection Procedure Possible Cause
  1. Inspect fuel pressure
  2. Inspect Engine Coolant Temperature Sensor (ECTS) and circuit (Check the DTC)
  3. Inspect long-term fuel trim and short-term fuel trim
  4. Inspect idle speed control system (Check the DTC)
  5. Inspect and test Electronic Throttle Control (ETC) module
  6. Inspect injector
  • Check the DTC
  • Low fuel pressure
  • Intake air leakage
  • Contaminated fuel
  • Weak sparks when ignited
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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