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Engine Shakes At Idle

A car that shakes while stopped with the engine running usually has a misfire or worn engine mounts.

Normal risk

Usually drivable, but have it checked soon. A flashing check engine light needs immediate action.

Short answer · Why does my car shake at idle?

Most often one cylinder is misfiring because of a spark plug, coil or injector, or the engine mounts are worn and pass vibration into the car. Check if the check engine light is on and read the fault codes. If it flashes, avoid heavy loads.

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Safe checks you can do

  1. Check the warning lightsA steady or flashing check engine light points to misfires.
  2. Shift into neutral or parkIf the shake drops, worn mounts may be part of the cause.
  3. Read fault codesP0300–P0304 point to misfires.

Questions that narrow it down

  1. Is the check engine light on or flashing?Points to a misfire.
  2. Does it shake more with the AC on?More load shows weak mounts or idle control.
  3. Does it also hesitate when driving?Supports a misfire.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Ignition misfirePlugs or coils.
  2. Vacuum leakLean mixture at idle.
  3. Worn engine mountsVibration passes into the body.
  4. Dirty throttle body or idle controlUnstable idle.

Questions about Engine Shakes At Idle

Can bad mounts damage anything?

They let the engine move more, which can stress hoses and exhaust parts.

Is some vibration at idle normal?

Diesel and three-cylinder engines vibrate a bit more, but a new shake is not normal.