Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
05-24-2014, 04:22 PM | #1 | |
AF Newbie
|
2008 Cobalt knock sound over bumps
There's a front end knock when driving over bumps. It's not incredibly loud and doesn't vibrate throughout, but it's noticeable. I checked the struts and they look pretty good, like new and turning the wheel they look fine. There is no issue with the shock travel; it bounces right back.
I changed the lower control arm bushings on both sides. They did look worn. The sound is still there. It's independent of each side. If the left tire hit a pothole it knocks on the left - same for the right. Next I think I look at the sway bar. everything looks very clean and rust free. The other 2 rubber bushings on the control arms looked brand new. Any ideas? |
|
05-24-2014, 09:24 PM | #2 | |
AF Enthusiast
Join Date: Aug 2011
Location: Beachside
Posts: 2,000
Thanks: 4
Thanked 303 Times in 301 Posts
|
Re: 2008 Cobalt knock sound over bumps
Check for looseness in the sway bar end links. Pretty common for them to wear and cause noises.
|
|
The Following User Says Thank You to gmtech1 For This Useful Post: |
Streetwise (05-24-2014)
|
05-24-2014, 10:00 PM | #3 |
AF Newbie
Thread starter
|
Re: 2008 Cobalt knock sound over bumps
|
05-24-2014, 11:17 PM | #4 | |
AF Enthusiast
Join Date: Aug 2011
Location: Beachside
Posts: 2,000
Thanks: 4
Thanked 303 Times in 301 Posts
|
Re: 2008 Cobalt knock sound over bumps
Easier than the bushings. Grab ahold of the ends of the sway bar and check for any up and down movement in the link ball sockets. Should not be any play.
|
|
The Following User Says Thank You to gmtech1 For This Useful Post: |
Streetwise (05-27-2014)
|
06-02-2014, 10:39 PM | #5 | ||
AF Newbie
Thread starter
|
Re: 2008 Cobalt knock sound over bumps
Quote:
I've seen guys grease them, is that a good idea? |
||
01-18-2015, 03:47 PM | #6 | |
AF Newbie
Join Date: Feb 2008
Location: Edmonton
Posts: 23
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: 2008 Cobalt knock sound over bumps
I know this is an old thread, but i'd like to add this anyhow for extra information. With the electric power steering there is a plastic bushing internally in the PS unit, and I think this is where the noise comes from. Search youtube for a good video explaining the solution.
|
|
|
POST REPLY TO THIS THREAD |
|
|