Help Diagnosing a Front Right Thump Sound - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Chevy Cobalt Owners Lounge General Chevy Cobalt discussion

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 03-26-2016, 05:42 AM Thread Starter
Initiate
 
Join Date: Jan 2010
Location: Deltona Florida
Posts: 37
Help Diagnosing a Front Right Thump Sound

05 LS with 115k


I have a thump sound whenever I start to move forward and again when slowing down. Sounds like something is moving when I accelerate and goes back when slowing down. Only momentarily not continuous.

If I have the car parked in drive on the ground and rotate the front right tire as far as it will go by hand forward and back I can feel the thump can not determine where it is coming from. Any suggestions as to where to start would be appreciated. Wheel bearings were replaced at 100k
gerardjg is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 03-26-2016, 05:48 AM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Sounds like lower control arm pancake bushing!

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #3 of 7 (permalink) Old 03-26-2016, 06:02 AM Thread Starter
Initiate
 
Join Date: Jan 2010
Location: Deltona Florida
Posts: 37
Quote:
Originally Posted by Coby7 View Post
Sounds like lower control arm pancake bushing!
Thanks I will look at that this weekend
gerardjg is offline  
post #4 of 7 (permalink) Old 04-09-2016, 06:10 PM Thread Starter
Initiate
 
Join Date: Jan 2010
Location: Deltona Florida
Posts: 37
Once I got the car jacked up it was the brake rotor, the 4 bolt holes were worn, the rotor would move about an 1/8 of an inch either way wearing into the wheel studs. New studs and rotors are on the way.
gerardjg is offline  
post #5 of 7 (permalink) Old 04-10-2016, 03:16 AM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
This means your lug nuts weren't torqued properly.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #6 of 7 (permalink) Old 04-10-2016, 05:11 AM Thread Starter
Initiate
 
Join Date: Jan 2010
Location: Deltona Florida
Posts: 37
Quote:
Originally Posted by Coby7 View Post
This means your lug nuts weren't torqued properly.
Thanks I guess I need to get my torque wrench calibrated or a new one is 100 ft lbs the correct torque?
gerardjg is offline  
post #7 of 7 (permalink) Old 04-10-2016, 06:36 AM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
For alloy wheels yes, 110 for steelies

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
Sponsored Links
Advertisement
 
Closed Thread

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome