C70 vibrations
#1
C70 vibrations
Hi, first off, i wanna apologize that my first post is basically straight to asking for help.
I have a 2011 C70 that’s developed some pretty heavy vibration. Its worst at 80km/h while the accelerator is pressed. If i ease off the gas at that point the vibration eases off. To me, this seems to imply a drivetrain problem. However, when i took it to the mechanic, he’s trying to convince me that its the suspension and he basically wants to change all the shocks and stabilizer links. Does this make any sense, or is he trying to get me to waste 2k on suspension?
it feels like when the cv boot was busted, but that was replaced last year and the mechanic said it still looks fine now.
Thanks. Any help appreciated.
I have a 2011 C70 that’s developed some pretty heavy vibration. Its worst at 80km/h while the accelerator is pressed. If i ease off the gas at that point the vibration eases off. To me, this seems to imply a drivetrain problem. However, when i took it to the mechanic, he’s trying to convince me that its the suspension and he basically wants to change all the shocks and stabilizer links. Does this make any sense, or is he trying to get me to waste 2k on suspension?
it feels like when the cv boot was busted, but that was replaced last year and the mechanic said it still looks fine now.
Thanks. Any help appreciated.
#2
#3
#4
Upon further testing, it seems to happen mostly around the 1500 to 2000 rpm range and not just at 80km/h like i initially thought.
#5
if the vibration seems to be tied to engine speed vs roadspeed, that would move motor and transmission mounts further up my suspect list :-) I'd probably do a few more test drives to see if you can replicate. Have you worked with a buddy to see if the engine has some unusual sounds or movements when revving or even power-braking? Note: Safety first, don't do this in front of a garage or with your assistant standing in front of the car while you press the brake and gas at the same time.
Last edited by mt6127; 09-23-2022 at 12:29 PM.
#6
I don’t recall there being *much* vibration when revving it in neutral. But i’ll check it again to be sure. Unfortunately i’m away for work right now so I won’t be able to test it again until this weekend.
Is it possible to check the conditions of the motor mounts without getting it up on a shop lift? Where are they and what would i be looking for?
also, could it possibly be the turbo? I’m assuming 1.5 - 2k is around the rpm range for the turbo to spool up. But could a faulty turbo cause engine vibrations? I’ve never dealt with a turbo unit before so i have no idea what to expect.
Is it possible to check the conditions of the motor mounts without getting it up on a shop lift? Where are they and what would i be looking for?
also, could it possibly be the turbo? I’m assuming 1.5 - 2k is around the rpm range for the turbo to spool up. But could a faulty turbo cause engine vibrations? I’ve never dealt with a turbo unit before so i have no idea what to expect.
#7
I don’t recall there being *much* vibration when revving it in neutral.
Is it possible to check the conditions of the motor mounts without getting it up on a shop lift? Where are they and what would i be looking for?
also, could it possibly be the turbo? I’m assuming 1.5 - 2k is around the rpm range for the turbo to spool up.
Is it possible to check the conditions of the motor mounts without getting it up on a shop lift? Where are they and what would i be looking for?
also, could it possibly be the turbo? I’m assuming 1.5 - 2k is around the rpm range for the turbo to spool up.
The turbo spins all the time. It's not your turbo. At xx rpms the turbine blades are spinning fast enough to overcome the vacuum created in the engine (by the pistons sucking air in) which becomes boost stuffing more air and fuel in the cylinders - creating more HP.
Once again - a symptom of a worn outer cv joints is vibration when accelerating that stops when a steady speed is reached. To check for a worn cv joint requires dismantling the joint - a very messy job. You can't see a worn CV joint without taking it apart.
#8
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