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Car Shakes When Idle – Top 7 Causes & Easy Fixes | OBD Spark Car Shakes When Idle – Top 7 Causes & Easy Fixes Advertisement Why Does Your Car Shake When Idle? If your car shakes when idle, it usually means the engine is not running smoothly. This issue is often related to air-fuel imbalance, sensor faults, or mechanical problems. OBD Spark Insight: Engine vibration at idle is often an early sign of deeper issues like vacuum leaks or misfires. Top 7 Causes of Car Shaking at Idle 1. Dirty Throttle Body Carbon buildup restricts airflow causing unstable engine performance. 2. Vacuum Leak Extra air enters the engine, leading to a lean mixture and shaking. 3. Faulty Spark Plugs Worn or dirty spark plugs cause misfires and engine vibration. Advertisement 4. Bad Engine Mounts Worn mounts fail to absorb engine vibrations. 5. Faulty MAF Sensor Incorrect airflow readings disrupt fuel injection. 6. Fuel Injector Issues Clogged injectors lead to...

Rough Idle Causes – Why Your Engine Runs Unevenly | OBD Spark Rough Idle Causes – Why Your Engine Runs Unevenly Rough idle occurs when your engine runs unevenly while the car is stationary. You may feel vibrations, hear irregular sounds, or notice unstable RPM. OBD Spark Insight: Rough idle is not just annoying — it's an early warning sign of engine problems. Top Causes of Rough Idle 1. Dirty Throttle Body Carbon buildup inside the throttle body restricts airflow, leading to an improper air-fuel mixture. Effect: Engine shaking and unstable idle. 2. Vacuum Leak Cracked or disconnected vacuum hoses allow extra air into the engine. Effect: Lean mixture causing rough idle and misfires. 3. Faulty Sensors (MAF / O2) Sensors send data to the ECU to control fuel injection. Effect: Incorrect readings lead to poor engine performance. 4. EGR Valve Problems A stuck EGR valve disrupts combustion by allowing incorrect exhaust gas flow. Effect: Rough i...