Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2023 Kia Telluride EX X-LineFACTORY OEM SERVICE PROCEDURE

Unstable idling

Inspection Procedure	Possible Cause
Inspect fuel pressure Inspect injector Inspect long-term fuel trim and short-term fuel trim Inspect idle speed control system (Check the DTC) Inspect and test Electronic Throttle Control (ETC) module Inspect Engine Coolant Temperature Sensor (ECTS) and circuit (Check the DTC)	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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