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.
All Models
Idle speed, ignition timing and ignition timing advance are controlled by the ECM and are not adjustable. When engine is idling the ECM tries constantly to adjust actual engine speed so that it matches specified value. This means that the actual engine speed when idling should always be approximately the same as the specified engine speed. If the idle speed is too high or too low, or if the engine does not idle smoothly, and there are no malfunctions stored in the DTC memory, perform the following tests:
- Check intake system for un-metered air (vacuum leaks).
- Check Throttle Valve Control Module. See AIR INDUCTION SYSTEMS in SYSTEM & COMPONENT TESTING article.
- Check EVAP canister purge regulator valve for constant open condition. Perform testing procedure under appropriate EVAP valve related DTC in appropriate SELF-DIAGNOSTICS article.
- Preform adaptation of Throttle Valve Control Module. See THROTTLE VALVE CONTROL MODULE ADAPTATION under DIAGNOSTIC FUNCTION 04 - BASIC FUNCTION in appropriate SELF-DIAGNOSTICS article.
NO RELATED
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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.