Knocking sound coming from back of car - Page 2 - Pontiac G6 Forum
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post #16 of 32 (permalink) Old 02-22-2012, 12:06 AM
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Ok. I had this prob on my GTP. Have someone rock the car side to side. Crawl underneath the back and put ur hand on the sway bar(away from any pinch spots). Can u feel the vibration of the clunk noise when u touch the sway bar? If u can, chances are that u have worn out sway bar bushings. Just follow the bar to each side to where it appears to have a bracket clamp with 2 bolts holding it. Your sway bar bushings should be in between the sway bar and the bracket clamp on each side directly under the trunk/seat area(underneath, bolted to the rear subframe). Just ask if u have questions.
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post #17 of 32 (permalink) Old 03-12-2012, 09:22 AM Thread Starter
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I'm sorry for being so clueless but where is the sway bar in the back?? What am I looking for?? Would you happen to have a picture that points out where I should be looking??
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post #18 of 32 (permalink) Old 04-03-2012, 05:35 AM
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I have the same problem,dealership told me it was the shocks. I replaced a number of things on the car, struts, shocks, brakes on all four corners, front sway bar links, inner outter tie rods, and front sway bar bushings, took car for test drive, front was nice and tight/solid (big improvement) still clunking in the rear though. took it in for the alignment, no go, need front ball joint, but they did notice the rear sway bar bushing is totally worn along with the link. this is very common cause of clunking noises from the rear on g6's
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post #19 of 32 (permalink) Old 04-03-2012, 05:39 AM
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So ordered 2 front control arms/ball joints from rock auto $109.99 ea. and ordered the swaybar kit from gm parts direct $70.78 hopin to put in next weekend (workin this weekend to pay for parts), will post results as soon as it's done
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post #20 of 32 (permalink) Old 04-03-2012, 03:11 PM
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Double check if the spare tire in the trunk isn't loose, i had a prob like that before and it was my spare tire wasn't bolted tight to the chassis how some cars have it and that's what was making the knocking/clunk noise.
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post #21 of 32 (permalink) Old 04-04-2012, 04:06 AM
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had a clunking about a year ago shortly after having a flat and buying 4 new tires, turned out to be the tire shop put the spare in wrong. this time when a similar noise came around, the first thing i did was take the spare out and took it for a ride, still had clunk, figured I would at least get it aligned since I just installed struts and the tie rods, alignment guy also noticed a bad front ball joint (i thought it might be questionable but didn't want to fork out the dough when doing the tie rods and struts) and the sway bar bushing in rear was bad and had slop along with the link being worn, gm parts direct has the whole kit and kaboodle for $70.78, everywhere else i've looked just have the link for 50-60 and the bushing for around 10,I like to go oem when i can unless it's a cheaper and proven upgrade (made it 140,000 on oem). anyone know of a cheaper proven upgrade?
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post #22 of 32 (permalink) Old 04-04-2012, 05:14 PM
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Quote:
Originally Posted by Diavolo View Post
I'm sorry for being so clueless but where is the sway bar in the back?? What am I looking for?? Would you happen to have a picture that points out where I should be looking??
Here ya go man. I took a video for you.

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post #23 of 32 (permalink) Old 04-05-2012, 05:21 AM Thread Starter
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Here ya go man. I took a video for you.

http://www.youtube.com/watch?v=7x0mp...1&feature=plcp
Wow thank you so much man, I really appreciate your time and effort!!!! Thanks!!!

Now i should just put my hand on it and shake it to see if its loose right?
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post #24 of 32 (permalink) Old 04-06-2012, 08:07 AM
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Wow thank you so much man, I really appreciate your time and effort!!!! Thanks!!!

Now i should just put my hand on it and shake it to see if its loose right?
Well it probably won't be that loose. Check along that bar for worn or cracked bushings. You'll probably need a pry bar to move the bar a little to see if there is play. This maybe a stupid question but since nobody can find anything clunking in the back....did you look where the spare tire goes? Is there something in there clunking around?
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post #25 of 32 (permalink) Old 04-06-2012, 10:26 PM Thread Starter
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Well it probably won't be that loose. Check along that bar for worn or cracked bushings. You'll probably need a pry bar to move the bar a little to see if there is play. This maybe a stupid question but since nobody can find anything clunking in the back....did you look where the spare tire goes? Is there something in there clunking around?
Ya I did check the area where the spare tire is. Everything is screwed tightly!!
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post #26 of 32 (permalink) Old 04-06-2012, 11:47 PM
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I had an extremely similar issue on mine, it happened to be the that the jack and wrench for the spare were not put in right and clunking around in the back. I know you said you checked already but you may want to take the spare and tools out of the trunk and drive around and see if the sound is gone after that.
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post #27 of 32 (permalink) Old 04-07-2012, 06:34 AM
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i can see the gap between my sway bar and bushing, the link is also a bit spungie, found everything in a sway bar kit, don't need the sway bar but cheaper than buying the bushings and a link. http://www.gmpartsonline.net/parts/2...iagram=FQ05490
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post #28 of 32 (permalink) Old 04-08-2012, 06:19 AM
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I have the same problem, it sounds REALLY bad. Makes the car sound so unstable. I had a front clunk, but turned out it went away when I installed my eibachs and new struts/mounts. As for the back, my mechanic told me it was the bushing inside the shock where it mounts, so I went ahead and replaced the shocks; still there. Ill have to check out the rear sway, but I'm in the same boat you are! It sucks!s
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post #29 of 32 (permalink) Old 04-09-2012, 10:31 AM
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It has to be something in the suspension. Bushings, links, sway bar, maybe your fuel tank is lose, try and check for that. Are your tires aligned? maybe your need an alignment in general. Could be a couple of things. My mothers acura tl had a rear knocking sound and it was coming from the tire, we didn't know til one day it just exploded on the e-way and after replacing it and getting the wheel aligned, the knocking sounds went away.
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post #30 of 32 (permalink) Old 04-09-2012, 07:19 PM Thread Starter
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Originally Posted by USMC0311 View Post
It has to be something in the suspension. Bushings, links, sway bar, maybe your fuel tank is lose, try and check for that. Are your tires aligned? maybe your need an alignment in general. Could be a couple of things. My mothers acura tl had a rear knocking sound and it was coming from the tire, we didn't know til one day it just exploded on the e-way and after replacing it and getting the wheel aligned, the knocking sounds went away.
Just came back from my mechanic and he said its my rear sway bar bushings that need to be replaced!!!!

Luckily for me its only 9$ per bushing lol
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