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Discussion Starter · #1 ·
Hi guys,

When I let go of the clutch quickly after shifting there’s a loud clunk under the car.

Also happens when when I tap the accelerator, it’s like somethings loose.

Been told that it’s not the clutch release bearing by a garage.

It’s making me hate driving.

Plz help.
 

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2014 ST3. Garrett Powermax turbo, Thermal Turboback, CPE intercooler, JBR intake, Innovative RMM
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What year is the car?
What mods does the car have?
 

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2014 ST3. Garrett Powermax turbo, Thermal Turboback, CPE intercooler, JBR intake, Innovative RMM
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First things i would check are the factory airbox where the 3 legs push through their rubber mounts(although usually it makes a squeak, not a clunk) as well as the rear motor mount. Ford did redesign the RMM for the 14 model year but that doesn't mean yours hasnt failed.

Im assuming there was nothing blatantly obvious wrong when the shop had it in the air to inspect it? Definitely needs put in the air if not.
 

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Discussion Starter · #7 ·
First things i would check are the factory airbox where the 3 legs push through their rubber mounts(although usually it makes a squeak, not a clunk) as well as the rear motor mount. Ford did redesign the RMM for the 14 model year but that doesn't mean yours hasnt failed.

Im assuming there was nothing blatantly obvious wrong when the shop had it in the air to inspect it? Definitely needs put in the air if not.
Thank you.

Ive borrowed some ramps from my neighbour so will put it up on them and check the mounts.

Not possible that it could be the transmission mount?
 

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2014 ST3. Garrett Powermax turbo, Thermal Turboback, CPE intercooler, JBR intake, Innovative RMM
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Thank you.

Ive borrowed some ramps from my neighbour so will put it up on them and check the mounts.

Not possible that it could be the transmission mount?
It could be but not as common. The rear motor mount (lowermost mount that does, in fact, bolt to the rear of the trans) is the only mount that directly handles the torque load applied by the engine.

Try to rock the engine and trans fore and aft (use a prybar if you have one available). If its bad you should hear it pop or see it move.

Just like in this video (although this RMM is aftermarket)

 

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2013 TS ST3, with some stuff done.
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Could be many things, duel mass flywheel, driveshaft, CV, diff, engine or gearbox mounts, to name a few.
 

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Hi guys,

When I let go of the clutch quickly after shifting there’s a loud clunk under the car.

Also happens when when I tap the accelerator, it’s like somethings loose.

Been told that it’s not the clutch release bearing by a garage.

It’s making me hate driving.

Plz help.
TGT has you on the right track.
What I would do is leave the engine off, trans in gear, then have someone push it back and forth to get the engine "rocking" and see if you can locate the thump that way. that will probably simulate what is happening. it does sound suspiciously like a loose or broken mount, but could be about anything banging if somethings come loose
 

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It could be but not as common. The rear motor mount (lowermost mount that does, in fact, bolt to the rear of the trans) is the only mount that directly handles the torque load applied by the engine.

Try to rock the engine and trans fore and aft (use a prybar if you have one available). If its bad you should hear it pop or see it move.

Just like in this video (although this RMM is aftermarket)

Hey!! You sum'b!
 

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2014 ST3. Garrett Powermax turbo, Thermal Turboback, CPE intercooler, JBR intake, Innovative RMM
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Thats the 2nd time I've used that video to demonstrate the movement that needs done. Your carnage is helpful.
Ugh, i still gotta talk to cpe about that too.
 

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2016 ST2, Absolute Black, Monster FMIC, Turbosmart BPV, ALEX' Shift Bushings,PCV-OCC, Innovative RMM
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Honestly if one wanted a hard durometer RMM, the Cobb gen 2 (gray bushing, no adjustable pin holes) looks better design, but it does use the stock bracket on the trans that isn't as good.

I had that Cobb and didn't like the vibes.

I've not used the cp-e.

I'm still liking the Innovative Solutions mount, but it also has pressed in bushings like the cp-e.
 

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Honestly if one wanted a hard durometer RMM, the Cobb gen 2 (gray bushing, no adjustable pin holes) looks better design, but it does use the stock bracket on the trans that isn't as good.

I had that Cobb and didn't like the vibes.

I've not used the cp-e.

I'm still liking the Innovative Solutions mount, but it also has pressed in bushings like the cp-e.
CPE stage 2 is the best by far, i ran mountune for a while and the CPE is a nice upgrade.
 

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2016 ST2, Absolute Black, Monster FMIC, Turbosmart BPV, ALEX' Shift Bushings,PCV-OCC, Innovative RMM
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CPE stage 2 is the best by far, i ran mountune for a while and the CPE is a nice upgrade.
... That the bushings can pop out of 😋😁
 

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My $ is on suspension bit(s) amuk! Chasing down noises is part of the joy of ownership. I'd start with getting front end up on jacks and taking wheels off so can access most of the suspension bits. Use hands and/or pry bar to see if you can reproduce noise. Also, may need to do more test drives and see exactly what combination of conditions needed to reproduce noise. accelerating decelerating turning braking turning L/R etc.
 
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