Your car shaking when idle can be caused by several common issues, including:
- Worn Spark Plugs: Spark plugs ignite the air-fuel mixture for the engine to run. If they're worn or dirty, they may misfire and cause shaking during idle. Replacing spark plugs every 30,000 to 50,000 miles is recommended.
- Damaged Engine Mounts: Engine mounts dampen vibrations and secure the engine to the frame. If they wear out or break, you may feel excessive vibrations while idling.
- Dirty or Clogged Fuel Injectors: Fuel injectors deliver fuel to the engine. If clogged with carbon deposits, they may disrupt fuel flow and contribute to shaking.
- Clogged Air Filter: A dirty air filter limits airflow to the engine, causing an improper fuel-air mix and shaking at idle.
- Vacuum Leaks: Loose or damaged vacuum hoses can introduce excess air into the mix, leading to engine misfires and vibrations.
- Faulty Oxygen Sensor: This sensor helps regulate fuel-air mixture. A failing sensor can send incorrect data and cause rough idling.
- Other possible causes: Faulty alternator, damaged engine belts, throttle body issues, or engine misfire.
Addressing these issues typically requires inspection and tuning by a mechanic to pinpoint the exact cause and make appropriate repairs or replacements to restore smooth idling.
