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Old 02-07-2014, 08:25 PM   #1
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Knocking sound left rear

Hello everyone. I m new here and hope someone can help me. I drive a 2011 Mustang GT with a couple of mods. Since about 2 weeks I'm getting a hard knocking sound from the left back. I can actually fell it on the floor of the car. First i thought my muffler is lose because I had that problem in the past but that is definitely not the problem. When we had the car on a ramp we checked everything bud couldn't find anything. Now the really strange part. It gets extremely worse when it's wet or cold outside. I'm hoping someone had a similar experience because I'm currently in Germany and there are not to many Mustangs around. Therefore it's really hard to find a mechanic here that knows what he is doing. Thanks for your help.

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Old 02-07-2014, 08:30 PM   #2
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Mine started doing the same, but on the right side rear. I didn't get time to look into it before storing it for the winter, but mine sounds like it's a bushing or isolator going bad. Does yours happen only overt bumps or rough road, or is it at all times? And what mods do you have?

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Old 02-07-2014, 08:36 PM   #3
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Hello WhoDat.
It happens mostly on rough roads. If I go over a big bump nothing happens. If i drive of a smal curve it really sound like my muffler hits the drive shaft or something. But like I said the muffler is definitely not the problem. My mods are a boss 302 intake with a jlt carbon fiber cold air intake. Headers and muffler from stainless steel. Bama tune and a 4.1 gear ratio.

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Old 02-07-2014, 10:30 PM   #4
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It's the sway bar end links....Ford replaced mine just recently.
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Old 02-07-2014, 10:40 PM   #5
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Ok thanks 5LHO. So I guess you had the same problem? To bad they won't replace mine. Plus it's going to take at least 6 weeks for me to order one from the US. Is there any way of fixing it without replacement?

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Old 02-08-2014, 12:06 AM   #6
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You can grease them with brake grease for temporary relief. It's a long standing issue with s197. The links are cheap, at least this side. Several companies make replacements and Energy makes poly bushing kits you can replace the rubber with.

I do believe what did mine in were the 100+ dragstrip launches on slicks. Took out the right rear shock, too. Ford replaced all that, nonetheless.
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Old 02-08-2014, 12:47 AM   #7
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Now that you've mentioned the sway bar bushings, I remember reading about that a while back. I guess I have a good starting point when I pull mine out of storage in March haha. Thanks 5LHO.

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Old 02-08-2014, 05:04 AM   #8
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Well... My front tires do that sometimes. I bugged out too. Turns out it's wheel hop/skip, whatever you want to call it. IMO it happens when half the tire gets traction and the other half slips on the road surface. Does your noise happen when you're sitting still or only when you're moving at slow speeds?

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Old 02-08-2014, 05:07 AM   #9
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Oops.. Lol.. My phone didnt download the above posts until after I commented.. Stay safe!! Its good to know that your wheel isn't going to fall off on the highway :-[ LOL

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Old 02-08-2014, 07:37 AM   #10
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Thinking outside the box, you could always remove the bar until you have a solution. Drive carefully until you figure out how it affects handling...it's less of s big deal than one might think, at regular road speeds.
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Old 02-08-2014, 08:15 AM   #11
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Thanks everybody. I will look in to the whole thing and keep you updated as soon as I had the car checked out.

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Old 02-08-2014, 08:38 AM   #12
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Literally, I just got my car back from the dealer yesterday, from them replacing these links and the cure is complete.

Now, I teach auto shop so, I had already thrown it up on the lift and done my due diligence under there checking the bolts, pulling the bar and silicone brake greasing all the contact points, etc. so, I knew that was the problem before I took it in.
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Old 02-08-2014, 09:31 AM   #13
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ok on mine the smallest bumps made that knocking noise sounds nasty if its the same problem on mine i had broken one of my shock or struts dont remember cause i replaced them on both sides ...
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Old 02-08-2014, 09:57 AM   #14
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The right rear shock was also blown on my car and just replaced at the same time as the links. I knew it wasn't the shock because I pulled the bar and the noise went away.

Blown shocks can make noise though, there is no doubt about that but, the links are the most common issue by far on the s197.
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Old 02-08-2014, 10:14 AM   #15
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I do have to say that this is kind of disappointing for a car that has 15000 miles down and is 2 years old. The problem is that i don't have any warranty over here. I already had to replace the seat motors that normally would have been under warranty.

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Old 02-08-2014, 10:30 AM   #16
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I understand your pain but, that's why I'd never buy one unless I had the dealer network to back it up. These cars are a budget sports car, people forget that.

You can buy new end links for 16 bucks each at Tousley Ford or the Energy kit for 24 for everything. It'd probably cost you more to ship it to where you are.
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Old 02-08-2014, 10:37 AM   #17
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Well what can I say. It was always a dream to drive a Mustang. Since ford never sold them un Europe you don't have much of a choice. What disappointed me was the fact that I went to the dealer where I bought the car with the broken motors when I was in Florida last October. Still they refused to exchange it.

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Old 02-08-2014, 10:49 AM   #18
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I geddit. I've had many brands/types of cars, all had issues of some kind or other. I have had 4 Mustangs, all 5.0s: a '68, '79, '88 and this 2012. This thing flat out smokes all the others, even the '88, which was variously nitroused, turbo'd or supercharged at different times. Can't really complain too much, even though Ford had to reconstruct the MT82 at 3000 kilometers because a cheap outsourced bearing failed on the mainshaft. Otherwise, they have happily dealt with the minor niggles like the end links that have shown up over the last couple years.
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Old 02-08-2014, 05:15 PM   #19
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5LHO could you maybe send me a link where you found those parts. I would like to contact them to see if they ship overseas. Thanks.

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Old 02-08-2014, 05:40 PM   #20
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Here ya go:

https://parts.autonationfordwhitebea...?SiteID=214771
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Old 02-08-2014, 05:51 PM   #21
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Thanks. It doesn't show me the parts but I'm sure I'll find them.

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Old 02-08-2014, 05:55 PM   #22
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yep, just go into the top right dropdown, select the stuff you need and go looking. It bumps you back to this page if you try to link to a specific part. It's on about page 6 of the rear suspension part of the catalogue. 16 bucks each "Base w. Perf. Package" means BBP w/o means, well, base....get the right one b/c the BBP has a 24 mm rear bar and base has 22.
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Old 02-08-2014, 06:01 PM   #23
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Thanks again. If I have any more questions I let you know.

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