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Why does 2004 KIA Spectra idle rough although check engine light is not on and spark plugs have been changed?

Here are a few possible reasons why your 2004 KIA Spectra might be idling rough even though the check engine light is not on and the spark plugs have been changed:

1. Vacuum leaks: A vacuum leak can cause a car to idle rough by allowing unmetered air to enter the engine. Check all the vacuum hoses and connections for leaks.

2. Dirty throttle body: A dirty throttle body can cause idling issues. Clean the throttle body with a throttle body cleaner and a rag.

3. Faulty idle air control valve (IAC): The IAC valve controls the amount of air that enters the engine at idle. A faulty IAC valve can cause the engine to idle rough. Try cleaning the IAC valve. If the engine idles better with the IAC disconnected, the valve may need to be replaced.

4. Faulty oxygen sensor: An oxygen sensor that is not functioning properly can cause the engine to idle rough. Check the oxygen sensor with a multimeter to see if it is still working.

5. Fuel injector issues: A dirty or faulty fuel injector can cause a cylinder to misfire, leading to rough idling. Try cleaning the fuel injectors.

6. Engine timing issues: Incorrect timing can cause the engine to idle rough. Check the timing belt or timing chain. If the timing belt is old, it may need to be replaced.

If you are not comfortable performing these checks, you can take your car to a qualified mechanic for diagnosis.

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