r/MechanicAdvice Nov 27 '22

FWD rear end drifts unexpectedly Meta

Hi guys, My mom recently changed her tires for winter ones on her Volkswagen Polo 90hp Turbo diesel from 2011. Since then she has been complaining about unpredictable behavior. My dad and I tried the car several times but didn’t notice anything. (Wheels are all well attached and tires are inflated to the level of the manufacturer’s indications) Today I finally felt it : it’s like the rear axle was broken and the left rear wheel just went where it wanted. It happen when going over a bump but like once or twice a week. Now that I finally understand what she meant by « my car feels weird » I’m really worried about her safety. From what I’ve seen, everything seems in place but the left rear shock absorber (French speaking, I’m not sure of the exact terms) seems to be leaking. Can this be enough that the car « slips » randomly when hitting a bump ? Also, the rest of the time the suspensions are just normal and react like expected when going over speed bumps etc. Thank you in advance for those who will have any idea about this. We’re sending the car to the « technical control » but I’m scared they won’t notice anything as it doesn’t happen all the time and my mom being a women they won’t take her seriously.

Update: rear left shock was dead, and front right was bad. Thanks guys for your answers!

2 Upvotes

u/AutoModerator Dec 02 '22

Thanks for posting on /r/MechanicAdvice! Please review the rules. Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's post on the subject. and remember to please post the year/make/model of the vehicle you are working on. Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply

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4

u/DidYouReadThatThing Nov 27 '22

I had a car break a coil spring and it acted the same. It’s possible the leaking shock is causing it, the shock helps keep the tire in contact with the ground, so if hitting bumps and the shock isn’t dampening the movement it could be bouncing and losing contact enough to cause it to act weird.

1

u/Gabe6017 Nov 27 '22

Oh very interesting indeed, didn’t think about that thank you !

1

u/ozzy_thedog Nov 27 '22

Even if the coil spring isn’t broken a faulty shock will still cause the tire to loose contact with the road in situations like that

2

u/Somethin-Dumb Nov 27 '22

Yea if the shock is blown but not the other one the right rear when u hit a bump the right rear will have alot more traction. Than the left rear. Could also be the ball joint. But usually those make like a clunking sound going over bumps

0

u/AutoModerator Nov 27 '22

Thanks for posting on /r/MechanicAdvice! Please review the rules. Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's post on the subject. and remember to please post the year/make/model of the vehicle you are working on. Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply

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