- Vacuum Leak: A vacuum leak can cause the engine to run lean (lack of fuel), resulting in rough idling and fluctuations in RPM. Check for any loose or cracked hoses in the vacuum system.
- Idle Air Control (IAC) Valve Issue: The IAC valve regulates the airflow at idle, and its malfunction can lead to unstable idle and engine racing. Check the valve's functionality or consider cleaning it.
- Throttle Body Issues: A dirty throttle body or faulty sensors within it can disrupt proper airflow and idling. Cleaning the throttle body and inspecting its components might be necessary.
- Faulty Oxygen Sensor: The oxygen sensor provides feedback to the engine control unit (ECU) about the air-fuel mixture, and a faulty sensor can confuse the ECU and cause erratic idling.
- Fuel Injector Problems: Clogged or faulty fuel injectors can cause inconsistent fuel delivery, affecting idling stability. Cleaning the injectors or replacing them if needed might resolve the issue.
- Spark Plug Issues: Check the condition of the spark plugs. If they are worn or damaged, they may not provide adequate spark, resulting in rough idling.
- Air Intake System Issues: Blockages or leaks in the air intake system can affect airflow, impacting engine performance and idle. Inspect and clean the air filter and ensure proper airflow through the system.
Note: Diagnosing engine issues can be complex. If you're not comfortable performing these checks yourself, it's advisable to consult with a qualified mechanic or service centre.
