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Discussion Starter · #1 ·
I have an Automatic base EcoBoost 2017 with 34k miles. Lately, I've been hearing a clunking noise from under the car. I'm hearing it from the converter, but my mechanic says he hears it from the back of the car. So we are trying to figure out if it was the torque converter or diff. When I step on it, under heavy load, I hear a clanking noise, sometimes the car stutters and it feels like its not putting down the power. right now we will replace the fluid from the trans and diff, check them for metal, and see where we go from there.

I would appreciate some advice on how to test for the issue or what it could be, thanks!
 

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I have an Automatic base EcoBoost 2017 with 34k miles. Lately, I've been hearing a clunking noise from under the car. I'm hearing it from the converter, but my mechanic says he hears it from the back of the car. So we are trying to figure out if it was the torque converter or diff. When I step on it, under heavy load, I hear a clanking noise, sometimes the car stutters and it feels like its not putting down the power. right now we will replace the fluid from the trans and diff, check them for metal, and see where we go from there.

I would appreciate some advice on how to test for the issue or what it could be, thanks!
Is it possible for you to put the clunking noise on video so we can hear it?
 

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What kind of clunking is it? Can you try and record the audio from your phone? Maybe fold your rear seat down and try to reproduce, you should be able to tell for sure if it's coming from the rear then.

Also, might be a dumb question but does it happen when you're spinning your wheels, like wheel hop noise? Cause that's normal to have some hop from the factory, look up some s550 wheel hop videos on YouTube. If that's your problem there are a bunch of different parts you can either piece together separately or buy a complete "stop the hop" kit from a few companies like steeda, bmr etc. I did a combination of bmr and steeda components over time so I could utilize the bigger bmr jacking rails and "stop my hop" at the same time for less than the full steeda kit in total.



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Could it be the auto?
 

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Discussion Starter · #5 ·
What kind of clunking is it? Can you try and record the audio from your phone? Maybe fold your rear seat down and try to reproduce, you should be able to tell for sure if it's coming from the rear then.

Also, might be a dumb question but does it happen when you're spinning your wheels, like wheel hop noise? Cause that's normal to have some hop from the factory, look up some s550 wheel hop videos on YouTube. If that's your problem there are a bunch of different parts you can either piece together separately or buy a complete "stop the hop" kit from a few companies like steeda, bmr etc. I did a combination of bmr and steeda components over time so I could utilize the bigger bmr jacking rails and "stop my hop" at the same time for less than the full steeda kit in total.



Sent from my Pixel 4 using Tapatalk
I'll try to get an audio recording today, it's not always reproducible as I figured out with my mechanic, but it's very audible when it does happen. And I don't think it's hop, the car doesn't put down enough power to hop in a straight line and its never had hop issues in the past. This issue started when I floored it to merged into traffic. I heard and felt the clunking noise as the car struggled to put down the power, stuttering when I tried to push it.
 

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That wasn't what I was thinking when you said 'clunking'. I'm going to take a guess and say "wheel bearing" maybe?? I think @TurboTigger604 replaced his at some point, so he could probably confirm if that's the noise it would make. I would lift the car and get underneath, and do a complete undercarriage and suspension inspection, with a flashlight. Something is askew.
 

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Discussion Starter · #8 ·
That wasn't what I was thinking when you said 'clunking'. I'm going to take a guess and say "wheel bearing" maybe?? I think @TurboTigger604 replaced his at some point, so he could probably confirm if that's the noise it would make. I would lift the car and get underneath, and do a complete undercarriage and suspension inspection, with a flashlight. Something is askew.
What confuses me is that noise only happens under load. Driving on the highway or around town like a grandma and it gives no issues. Also, what can cause a loss of power?
 

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That wasn't what I was thinking when you said 'clunking'. I'm going to take a guess and say "wheel bearing" maybe?? I think @TurboTigger604 replaced his at some point, so he could probably confirm if that's the noise it would make. I would lift the car and get underneath, and do a complete undercarriage and suspension inspection, with a flashlight. Something is askew.
The wheel bearings will create a clunk sound when taking off from a stop. Worth checking, jack up the car and wiggle back and forth at 9 and 3 oclock and see if the wheel has play.
 

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Discussion Starter · #11 ·
The wheel bearings will create a clunk sound when taking off from a stop. Worth checking, jack up the car and wiggle back and forth at 9 and 3 oclock and see if the wheel has play.
Okay, I went under the car and everything looks fine, I test drove it with my friend and he was able to recreate that sound. My car only has 34k on the od so its pretty clean underneath. It's starting to look more and more like its the converter. For now, it's safe to drive as long as I don't push it, in a few days I'll see the trans fluid for metal.
 

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The warranty just expired... I know, I have amazing luck, I should give the lottery a shot
You're going about it pretty methodically. You have some solid next steps. You'll get to the bottom of it. Keep us posted with the state of the trans fluid.
 

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Discussion Starter · #15 ·
You're going about it pretty methodically. You have some solid next steps. You'll get to the bottom of it. Keep us posted with the state of the trans fluid.
I bought the fluids, filter, and gasket to do a flush of the trans. I'm not looking forward to the repair bills, I'm having some bad flashbacks to my old 05' gt that cost me 4k in repairs in three months... Oh well, sometimes life be like that...
I'll keep you guys posted for what comes in these next few days.
 

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The warranty just expired... I know, I have amazing luck, I should give the lottery a shot
These cars come with a 60K/5yr power train warranty from the factory--and it transfers if the car is sold. That means even if you didn't purchase this car new you should still have 26K and some 2 years left on the power train warranty.
 

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Discussion Starter · #17 ·
These cars come with a 60K/5yr power train warranty from the factory--and it transfers if the car is sold. That means even if you didn't purchase this car new you should still have 26K and some 2 years left on the power train warranty.
I got told by the dealer that the factory warranty was only 3 years or 30k miles. when I bought the car I still had a year left and I didn't think something like this would happen anytime soon. I'm still waiting on the trans fluid, so I'll confirm if its a trans issue or not Monday-ish.
 

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