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My mechanic inspected our CT but couldn't find any visible damage to the CV axle shafts. Is the shake asymptomatic or will continuing to drive the car as is cause greater issues?
If a mechanic says it's not the CV axles then possibly the tires need rebalancing. I wouldn't want to drive long term with a vibration.
 

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The tires are fine.

I assume it's possible that damage to the CV axles could cause the vibration but not be visible to the naked eye.


Why not?
Vehicle preservation and safety.
How is it tires are dismissed as the source? Were they rebalanced?
 

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Hello!
First of all I bought this car on May 26, 2021. I found out about the ECO problems, did some research, and bought the S-VCM. I installed it correctly.
Carfax showed that there was a recent tire alignment and wheel balance, so I don't believe the problem lies there. Brand new tires btw.

ECO light came off and everything was fine at low speed; no shudders/shakes going up to like 50 mph on city roads.

I get on the Highway and it does fine accelerating to speed limit (70) I'll stay at same speed for a bit, but when I start to slowly accelerate the engine shakes. I'm lightly pressing on pedal to go up 5 to 7mph and along the way to the new cruising speed it will just shake until I stop adding gas. ECO light still doesn't come on. Its as if it went to ECO mode but not showing the light. Weird.
I figured S-VCM will work at all times. Seems to work at the low speed acceleration.
Can't be bad engine mount since it would shake all the time or most of time.
I'm thinking spark plug change might work. Idk when it was last done. If I get same problem after that then I'm at a lost.
Could it be some spark plugs going bad? I don't have check engine light on.

The car drives quiet and smooth until highspeed acceleration whether I kinda floor it or slowly accelerate

Oh and this is a V6 FWD

Edit: As of June 30, 2021 the New CV Axle shaft fixed the problem.
Not true.- just had the Rack and Pinion assembly replaced. The Front motor mount was failed. The hydraulic dampening was shot. A huge improvement in the shudder - Still there a tiny bit but much better. Also have S-VCM installed too. The car has almost 300K on it so take that in account too. So much info on this subject
 
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