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Old 06-05-2014, 08:56 AM   #1
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Koni STR.t making noise

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I purchased and installed a set of Koni’s for my 2013 GT, now I hear a noise coming from the left front strut. This started immediately.

Though it was my first install, it went off w/o a hitch. I had the right tools, took my time and made sure everything was torqued to spec. When I test drove the car after the install everything was fine but then I started to hear a very faint noise like a piston working sound (hard to explain). If I have the radio on at barely audible levels you can’t hear it. After driving the car for 300 miles, I removed the wheels and re torqued all bolts, still the same noise. I found out if I drive the car for a couple of miles, I can physically pull up on the fender and the car makes the piston noise almost as if the Strut is binding on something.

Has anyone ever experienced this? If so, what have did you do to stop the noise?
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Old 06-06-2014, 01:45 AM   #2
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Were they the correct struts for the 2011+ models? Did you replace or have any issues with the strut mounts? If everything is tight and the install went well, I'd say you got a bad strut.
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Old 06-06-2014, 06:28 AM   #3
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Yes, they are the correct struts for the 2011+.

I didn't replace the strut mounts, had no problems with them coming apart like others have experienced.

I think the issue might be with the Strut as well. Going to have a mechanic friend take a look at it before I order a new one.
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Old 06-06-2014, 06:38 AM   #4
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The factory strut mounts are poorly made and even though it didn't come apart on you, I would still keep it in mind as the possible cause. An upgrade to C/C plates or at least the GT500 strut mounts would probably be a good idea.
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Old 06-06-2014, 09:08 AM   #5
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The factory strut mounts are poorly made and even though it didn't come apart on you, I would still keep it in mind as the possible cause. An upgrade to C/C plates or at least the GT500 strut mounts would probably be a good idea.

GT500 mounts don't work on 11+ struts.
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Old 06-06-2014, 09:59 AM   #6
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The factory strut mounts are poorly made and even though it didn't come apart on you, I would still keep it in mind as the possible cause.
This is what I'm thinking.
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GT500 mounts don't work on 11+ struts.
Correct. Which is a good reason to get 05-10 struts and use the GT500 mounts.
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Old 06-06-2014, 10:08 AM   #7
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Correct. Which is a good reason to get 05-10 struts and use the GT500 mounts.
That's what I have. 05-10 Koni STR.Ts with GT500 upper strut mounts. Not a sound so far.
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Old 06-07-2014, 07:13 AM   #8
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I have the Koni 11-14 I blew top mounts costs 42$ at ford hasn't made a noise since
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Old 06-07-2014, 07:20 AM   #9
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I have the Koni 11-14 I blew top mounts costs 42$ at ford hasn't made a noise since
How long were your Konis installed before your mounts went?
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Old 06-07-2014, 07:30 AM   #10
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A week or so it was only the driver side but it would make a terrible metal on metal sound when I turned the wheel.

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Old 06-07-2014, 12:18 PM   #11
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Yeah the mounts are going to make more noise when turning the wheel than from up and down motion. I still think you have a bad strut. Best way to tell is take that corner back apart separate the spring and strut and work the strut by hand. It should be firm and silent when you push down on the rod and return on its own to the top position within a couple seconds.
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Old 06-07-2014, 12:37 PM   #12
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Wait, so I was planning on getting bmr lowering springs with the gt500 strut mounts. Does this mean I need to get the 05-10 str.t koni's?
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Old 06-07-2014, 12:39 PM   #13
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Wait, so I was planning on getting bmr lowering springs with the gt500 strut mounts. Does this mean I need to get the 05-10 str.t koni's?
You need a strut for 05-10 years.
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Old 06-07-2014, 12:43 PM   #14
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Koni STR.t making noise

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Originally Posted by TCopp View Post
Wait, so I was planning on getting bmr lowering springs with the gt500 strut mounts. Does this mean I need to get the 05-10 str.t koni's?

With those strut mounts you use 05-10 struts.
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Old 06-07-2014, 09:20 PM   #15
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Originally Posted by Grabber Blue5.0 View Post
You need a strut for 05-10 years.

Why is this? koni made the 11-14 struts not compatible with gt500 mounts but they are for 05-10? Weird.
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Old 06-07-2014, 09:36 PM   #16
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Why is this? koni made the 11-14 struts not compatible with gt500 mounts but they are for 05-10? Weird.

It's because the 05-10 mustangs (including the gt500) use a different shaft size than the 11-14 v6/gt mustangs. Koni was one of the first aftermarket companies to recognize this and offer a specific 11-14 strut
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Old 06-07-2014, 09:41 PM   #17
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Originally Posted by Soccerluvr4 View Post
With those strut mounts you use 05-10 springs
Nope. I've got 11+ springs on 05-10 struts with gt500 mounts. Works like a champ.

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Why is this? koni made the 11-14 struts not compatible with gt500 mounts but they are for 05-10? Weird.
This goes for all aftermarket struts. It's due to the length of the threaded portion at the top of the 11+ struts being shorter than the 05-10s. It's not long enough to go through the gt500 mounts. I can say this from personal experience and wasted money.
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Old 06-07-2014, 09:46 PM   #18
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There's an extremely high chance its the factory strut mounts as users have reported. Also, I didn't see you mention anything about getting a proper alignment after installation... I'd recommend that as well.
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Old 06-07-2014, 09:50 PM   #19
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There's an extremely high chance its the factory strut mounts as users have reported. Also, I didn't see you mention anything about getting a proper alignment after installation... I'd recommend that as well.

I'd certainly not recommend getting an alignment done until he fixes the clunk. Otherwise he's just throwing away $80.
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Old 06-07-2014, 09:57 PM   #20
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It's because the 05-10 mustangs (including the gt500) use a different shaft size than the 11-14 v6/gt mustangs. Koni was one of the first aftermarket companies to recognize this and offer a specific 11-14 strut
Very good to know, thanks!
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Old 06-07-2014, 10:27 PM   #21
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There's an extremely high chance its the factory strut mounts as users have reported. Also, I didn't see you mention anything about getting a proper alignment after installation... I'd recommend that as well.

I'd certainly not recommend getting an alignment done until he fixes the clunk. Otherwise he's just throwing away $80.
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Old 06-08-2014, 06:19 AM   #22
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If you use the GT500 mounts an alignment isn't necessary.
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Old 06-08-2014, 02:49 PM   #23
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If you use the GT500 mounts an alignment isn't necessary.
Oops. Misread.
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Old 06-08-2014, 03:44 PM   #24
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If you use the GT500 mounts an alignment isn't necessary.

An alignment is recommended any time the suspension is apart. No adjustments may be needed, but still best to check. Tires aren't cheap, and even a slightly out if spec alignment can destroy them in weeks. Not to mention darty or floaty characteristics from the front suspension if toe or caster is off.
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Old 06-08-2014, 04:50 PM   #25
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Plan to do that in the next couple of days, I suspect that the unit is bad.

---------- Post added at 05:50 PM ---------- Previous post was at 05:49 PM ----------

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I'd certainly not recommend getting an alignment done until he fixes the clunk. Otherwise he's just throwing away $80.
Yep, that's my plan. Get all of this worked out before the alignment.
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Old 06-08-2014, 05:05 PM   #26
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An alignment is recommended any time the suspension is apart. No adjustments may be needed, but still best to check. Tires aren't cheap, and even a slightly out if spec alignment can destroy them in weeks. Not to mention darty or floaty characteristics from the front suspension if toe or caster is off.
Wrong. If you install the GT500 mounts with the arrows pointed in you'll gain back the camber you lost. The toe isn't affected enough to warrant checking. But by all means spend the money if it makes you feel warm and fuzzy.
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Old 06-08-2014, 05:58 PM   #27
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Wrong. If you install the GT500 mounts with the arrows pointed in you'll gain back the camber you lost. The toe isn't affected enough to warrant checking. But by all means spend the money if it makes you feel warm and fuzzy.

FYI...most places do not charge to do an alignment check so it's free if there's no adjustments needed. How's that for warm and fuzzy. 😁
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Old 06-08-2014, 06:03 PM   #28
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FYI...most places do not charge to do an alignment check so it's free if there's no adjustments needed. How's that for warm and fuzzy. 😁
I check my own alignment in my garage with nothing more than a straight edge and a digital level. Pretty smart huh? No fancy equipment needed.
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Old 06-08-2014, 06:19 PM   #29
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Koni STR.t making noise

No matter how good you are with that straight edge and digital level, you'll never get it as perfect as an alignment rack will. But if you want to continue to argue over the matter I'll oblige.
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Old 06-15-2014, 10:42 PM   #30
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Got the new Strut in, all is right with the world! No more noise. Surprised I had a problem with the first one. Handled everything with white gloves.
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Old 06-15-2014, 10:48 PM   #31
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I have the 11+ konis with ground control cc plates. The gc plates are the best way to go in my opinion and experience.
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Old 06-16-2014, 01:36 AM   #32
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Got the new Strut in, all is right with the world! No more noise. Surprised I had a problem with the first one. Handled everything with white gloves.

Good to hear! Were you able to get the strut replaced under warranty?
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Old 06-16-2014, 06:27 AM   #33
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Not yet but I have spoken to LMR and they told me I should be able to. Will contact them this morning to determine what the next steps are.
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Old 06-16-2014, 04:34 PM   #34
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No matter how good you are with that straight edge and digital level, you'll never get it as perfect as an alignment rack will. But if you want to continue to argue over the matter I'll oblige.
I am a machine and good at what I do.
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Old 07-08-2014, 11:33 AM   #35
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Sorry to thread jack, but grabber, if I changed the position of the arrow pointing inwards, I wouldn't have camber issues? Arrow pointing outward was obviously in the directions.....


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