So i have been searching the web far and wide and checking and replacing every possible outcome but I can't seem to find the solution, i have a shaking in the front end that feels like death wobble almost, ONLY at high rpms, when i let off throttle it goes away and so far it's led me to solve plenty of preexisting issues on my 04 tl, that being sticking calipers, unbalanced wheels, needing a tire rotation, tightening mounts and suspension component bolts and nuts, fixing tie rods, inspecting everything visually there, checking for any engine related issues whether fuel or spark related and nothing has really helped. Heck I've even put a different set of wheels and tires to the front end and still no change, checked the ebrake as well. So I'm here in hopes that someone here has experienced this issues because everything i am seeing is related to speed which mine is not, i can cruise at 70mph fine but if i floor it getting there everything goes bad. And yes before anyone asks i have checked the motor mounts and they have been recently been replaced. So please anyone who has had any issues similar chime in on this 🙏

 

How many miles are on the car?
Are the axles factory originals?

 

130k miles on it, i believe the axles are factory but I've had a couple people check them and everyone says they seem okay, i also had the car in the air in drive and tried to replicate the problem and it didn't shake, it only seems to shake driving on the street i dont know if that part matters but figured id mention it. There's almost no clicking clunking or anything else that should point towards axles, I've also tried launching the car to see if anything feels weird there and there's nothing off about that as well

 

Do bushes #9; 10 & 11 below show any signs of deterioration or tearing when up on the lift?

Are sub-frame bolts #25 & 26 properly fastened?

Are the #3 and two #14 steering rack bushings in good shape / tight?

Otherwise, outside of everything you have listed that was checked, not sure.

 

Bushing 10 has a little bit of wear, the subframe bolts seem to be tight as well. As for the rack the passenger side looks a little worn, theres a leak but i haven't noticed any steering issues at all or big loss of steering fluid (not sure what the symptoms of that would be) i will also double check the subframe bolts as well, can't leave any stone not double checked lmao I've been triple checking everything

 

has the car been lowered in the past or currently lowered? Usually vibration under acceleration is axles or the half shaft on the passenger side. (connects axle to trans - has a bearing that can go bad).

I had this issue and went with some ones from rock auto (APWI Brand)

 

Yeah its currently lowered not much at all though and it's only been a few months, is that something i can inspect to diagnose or confirm thats the issue or do i just gotta wing it? Another thing is my alignment is currently out of wack because of doing the tie rods but also my coilover on the front right where most of the issue is coming from, the dampening knob on that one was loose so it wouldn't adjust correctly and was set to full stiff when my driver front coil was not so i believe that is a big part of it too, alot of the shake went away and it mostly seems to be the alignment shaking the steering wheel like i feel like i habe to fight the wheel. But i will definitely check the half shaft if there's any way to physically inspect that, nothing near the axle really seems loose though (idk if thats a sign of bad half shaft but figured id mention that)

 

Okay so for an update... Looks like the shake isn't exactly isolated to just the front end. Whole car shakes. But anyways, I've now replaced the axle, ball joint, lower control arm, had my tires rechecked found out two of them were a good bit out of round, had those two replaced and rebalanced, got new hub rings for my wheels as they were worn, tightened a few things ie: app sensor, radiator, radiator fan, just a slew of random things I've checked. And i still have yet to fix this shake, seems to be more isolated to 55-80mph now with no shake really before and after those speeds, and it isn't only high rpms but just any load that is more than necessarily needed to maintain said speed. So if anyone could have any further update that would be great, thank you.

 

well if you had 2 wheels out of round, what about the other 2? I bought some used wheels that had 1 out of round so much that it had to be heated and rounded out.. And I have another one that is slightly out of round but it is not so bad that it cannot be fixed by "rotating the tire on the wheel". Discount Tire calls it a Road force balance. It is not when a tire wobbles down the road, but when basically thethe tire and the rim together as a unit is not round in the Up and Down direction. So it basically feels like you are running over bumps in the road.

Try swapping your wheels out tmporarily with another set to see if the problem remains.
Or Try moving the wheels around to different corners to see if it changes slightly.
And make sure you have the right size Hub adapters.
The wheel Nuts should also be formed just like your wheels. They have different nuts that are shjapped differently. If any are lose it may shift the tire/wheel around
bad shocks can also cause wheel hop. haha But they would have to be really bad

 

Thank you the reply 🤙 yeah i had the other two checked as well and they were fine, have already tried another set of wheels and tires as well as double checking the hub rings... I'm suspecting my front motor mount (innovative mount) is part of the culprit as now even tightened and the nut on holding both pieces together, you can see the top part of the solid mount lifting out of the hottom half a little. With these innovative mounts I've had the unfortunate issue of the nut on the bottom falling off even after tightening and thats happened twice now and i unknowingly was driving with a loose mount because of this and i believe it accelerated the failure of the mount. That's my last theory since so much has been checked... I asked my mechanic why it would go away around 80mph though snd he said the motor torque fall off would be the reasoning as not having as much power to lift the motor out of the mount which does make sense since the tl tends to fall on its face around 80-100. So I've gotten in touch with innovative regarding their warranty on this mount and will update if this does or doesn't solve the issue 🤞 if they take too long to reply though i might just switch back to oem mounts for now

Edit: forgot to mention, i have swapped out the lug nuts to the correct ones sold by the wheel manufacturer themselves and the coilovers are a few months old so it shouldn't be that as well 🤞

 

sometimes finding a good wheel alignment machine that is calibrated correctly, and a person who is skilled enough to use it,.. is hard to find.
You can literally go to another store and ask them to do a full balance on your tires, and they will measure something different than the first place you were at..
So I dont trust anyone.
And that guy who said the torque rolls off at 80... well.. I would not listen to that jabber.. blah blah blah... Just tell them anything! haha

 

Yeah you're right I've had the tires balanced at two different places now, definitely seen a different in terms of where they put the weights and how many. And yeah that could be true that it doesn't really fall off all that much but really the shake is the worst in 2nd and 3rd gear, while it is still felt in the others it seems to be in the strongest torqiest gears which is why im inclined to believe that possibility. For me atleast when im at 90-100 you can feel quite a power loss in the car
But again im open to all possibilities because ive tried so much with it and have came up short of solving this issue time and time again

 

That doing 90 or 100 doesn't have anything to do with torque rolling off which would solve a wheel balancing problem or a vibration problem haha it's stupid.. they're pulling your leg ...don't believe that Jibber Jabber.. it's illogical

 

Fair enough, either way i know the motor mount is atleast a problem of sorts because there shouldn't be play in it like that and when i do the test hold brake and hit gas you can feel the motor thud back down when you let off. Either way, I've had the tires balanced by two different shops now and that hasnt changed it so unless the third time is the charm i wonder why it would be that

 

Yeah if your engine is lifting up you probably have more than one bad motor mount

 

Yeah that's what i was thinking too but they are all less than a year old, and i took out all 3 mounts and inspected them and have only seen issues with the front 🥲 this whole situation makes no sense and that's what's really weird about it... I've even had multiple mechanics look at it and give me advice, some of which are my friends and still haven't got nowhere... Very odd

 

I Only said if you have a motor that is bouncing around and yeah you've got a bad motor mount I didn't say it was causing your vibration between 55 and 80.
Also I would go with OEM parts or close to OEM

 

Yeah i don't know what really is going on but ill eventually get to the bottom of this and be able to document this in the thread in case someone else has this odd issue

 

@Justin0104 , did you ever solve this issue? I have the exact same problem.. I think it is my half shaft but am unsure, and hoping it is not in the engine / transmission.

Please if you see this let me know.

Thanks

 

It ended up being both my cv axles were shot, i still have a slight shake after replacing them but i also have a slight bend in the lip of a rear wheel, as well as i have a tie rod that needs replacing so pretty sure that's all that's left but yeah the main shake was my cv axles. I replaced them with gsp axles from rockauto and they are the best aftermarket cheaper axles.