FixVault

Engine is unstable while driving

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