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Car Shakes When Starting The Engine

A strong shake as the engine starts or stops usually comes from worn engine mounts, a weak battery that slows cranking, a misfire on start-up or a worn dual-mass flywheel.

Normal risk

Usually not urgent. Have it checked if the engine also runs rough or a warning light comes on.

Short answer · Why does my car shake when I start it?

During starting and stopping, the engine passes through low speeds where it vibrates most. Healthy mounts absorb this. Worn mounts, a slow crank from a weak battery, a cylinder that misfires until warm, or a worn dual-mass flywheel make the shake stronger. Diesels naturally shake a little more.

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Safe checks you can do

  1. Note if it settlesA shake that settles after a few seconds may be a cold misfire.
  2. Check cranking speedSlow cranking points to the battery.
  3. Watch the engine moveExcessive rocking points to mounts.

Questions that narrow it down

  1. Is it worse when cold?Cold misfire or glow plugs on diesels.
  2. Is there a rattle when switching off?Dual-mass flywheel.
  3. Is the engine light on?Read misfire codes.

Possible causes

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

  1. Worn engine mountsShake passes into the cabin.
  2. Weak batterySlow, rough cranking.
  3. Misfire on start-upRough until warm.
  4. Dual-mass flywheel wearShake and rattle on start or stop.
  5. Glow plug faultDiesels run rough when cold.

Questions about Car Shakes When Starting The Engine

Is some shake normal?

A brief, mild shake is normal, especially on diesels.

Does start-stop make it worse?

Frequent restarts make worn mounts more noticeable.