LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Kia >> 2023 >> Niro Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control/Fuel System - General Information (PHEV) >> Troubleshooting >> Basic Troubleshooting Guide >> Symptom Troubleshooting Guide Chart >> Engine is unstable while driving
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine is unstable while driving

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