# Knocking or Flexing Sound **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [October 13, 2018, 12:57am UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658 "2018-10-13T00:57:47Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [October 13, 2018, 12:57am UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/1 "2018-10-13T00:57:48Z")
Last week, I had a right front wheel bearing replaced in my 2005 Buick Century. Now it makes a knocking or flexing sound when I accelerate from a standstill or come to a stop. Sometimes I hear it when I turn the steering wheel when stopped. Could the mechanic have damaged or loosened something while replacing my wheel bearing? Could it be an engine mount? Loose struts? Any answers will be appreciated. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 13, 2018, 1:16am UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/2 "2018-10-13T01:16:13Z")
> [@jmcarc](#): > > a knocking or flexing sound Knocking I get, flexing I don’t understand. Is it on the same side as the bearing replacement? The knocking could be a worn stabilizer bar link. Spinning them with an impact wrench removing them can damage them. Or on a 13 year old car, it may be time to replace them. Have the mechanic that did the work look it over to make sure he didn’t leave something loose. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 13, 2018, 1:35am UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/3 "2018-10-13T01:35:37Z")
Bring the vehicle back, and ask that they check for a broken strut spring. Tester ---
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [October 13, 2018, 1:15pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/4 "2018-10-13T13:15:58Z")
I brought the car back to the mechanic Saturday morning, it was cool and rainy and of course, it wasn’t making the clunking sound. Could it be a heat-related issue? Could it be a worn CV joint that acts up when it gets warm from friction? ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 13, 2018, 1:20pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/5 "2018-10-13T13:20:18Z")
If you don’t answer my questions, I can’t answer yours… ---
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [October 13, 2018, 1:24pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/6 "2018-10-13T13:24:43Z")
It’s a knocking noise. I can’t tell which side. ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [October 13, 2018, 1:27pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/7 "2018-10-13T13:27:28Z")
Can you post a sound clip when its doing it?We are just guessing here. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 13, 2018, 1:30pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/8 "2018-10-13T13:30:45Z")
So what is a “flexing noise” ?? ---
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [October 13, 2018, 1:51pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/9 "2018-10-13T13:51:22Z")
Similar to a squeaky floor. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 13, 2018, 2:02pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/10 "2018-10-13T14:02:05Z")
I’m still thinking worn stab bar links. They clunk and creak, moisture would tend to quiet the squeak but not the clunk though. Could also be CV joints or a loose steering rack. Also agree with @tester check for a broken spring… the last coil against the strut is a good place to look. ---
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [October 13, 2018, 2:35pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/11 "2018-10-13T14:35:42Z")
I don’t have my car now (Oct 13 morning) it’s in the shop. The noise on the You Tube video link is similar, but my car makes it mostly on acceleration from a standstill or when coming to a stop. It doesn’t make the sound when cruising on a smooth surface. ---
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [October 13, 2018, 3:44pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/12 "2018-10-13T15:44:54Z")
I just called my former mechanic (now retired). He told me it could be worn engine mounts considering the 150,000 miles. is it possible? I just relayed this info to the shop where the car is now. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 13, 2018, 3:45pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/13 "2018-10-13T15:45:32Z")
Yes, that is possible ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 13, 2018, 4:01pm UTC](https://community.cartalk.com/t/knocking-or-flexing-sound/126658/14 "2018-10-13T16:01:40Z")
> [@jmcarc](#): > > Sometimes I hear it when I turn the steering wheel when stopped. I can’t see how worn engine mounts would cause a noise under that condition. Tester