How to detect bad motor mounts

Written by justin cupler Google
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How to detect bad motor mounts
Your motor is designed to only move a little bit under torque; motor mounts make this possible. (motor image by Petr Efremov from

Motor mounts are designed to keep your car's engine in place and allow for minor movement under hard torque. A bad motor mount is not only annoying because your car now makes all kinds of clunks and thuds, but it can also cause major damage to other components as they are not lining up properly. Diagnosing a faulty motor mount is a relatively easy task; you just need to know the steps to take and what you need to look for.

Skill level:

Things you need

  • Flashlight

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  1. 1

    Open the bonnet of your vehicle.

  2. 2

    Start your vehicle. Have a friend put the car in drive and press the brake and gas at the same time.

  3. 3

    Observe the movement of the engine. If it moves more than an inch or so, there is a problem with a front mount. Use the flashlight and repeat Step 2 and observe the actual mount to see if it is broken or if a bolt is just loose.

  4. 4

    Place your car in reverse and have your friend press the gas and brake at the same time. Observe the engine movement. If it moves more than an inch or so, there is a problem.

  5. 5

    Repeat Step 4 and use a flashlight to observe the actual mount and see if it is broken or if it simply has a loose bolt.

Tips and warnings

  • Do not continue to drive on bad motor mounts as severe problems can occur, such as transmission problems, exhaust leaks and, worst of all, your accelerator cable can engage the throttle, causing the accelerator to stick.

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