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Go Back   E46Fanatics > Classifieds > For Sale, For Trade or Wanting to Buy > Suspension and Braking

Suspension and Braking
Springs, shocks, struts, coilovers, camber plates, sway bars, strut bars, suspension bushings, control arms, brake pads, big brake kits, etc.

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Old 07-10-2011, 04:09 PM   #1
Eric_e46
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Why does my car drift on it's own?

I don't really know if this is the correct place to put this on, but please bare with me.

I have a 323i 1999.. Completely stock suspension, so it's pretty worn out. However when I'm driving, let's say 70mph on the freeway, if there is a SLIGHT curve with a moderately bumpy road. My cars rear end will start drifting. Not a lot, but to the point where it scares me enough to slow down because i feel like ima loose control. It also needs that bushing, the one that holds the body?.. When I step on the break I feel the body shift forward.

Is it the bushing and the suspension that need to be changed? I'm terrified of turns with a bunch bumps on the freeway now.. I'll slow down to like 55 because I feel like one of these days it's gonna completely loose it.
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Old 07-10-2011, 04:13 PM   #2
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i'm going to say you have some issue with either your rear subframe (being a 99 it'll qualify for a free fix in case it's ripped off the body) or maybe a disconnected front sway bar... bad FCABs won't do that. put your car in the air (jackstands/lift) and start tugging on your wheels and see what is loose.
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Old 07-10-2011, 04:39 PM   #3
Many330i
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Have you ever changed any of your bushings?

Start with your RTAB's asap then change those rear shocks..
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Old 07-10-2011, 04:57 PM   #4
Eric_e46
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Quote:
Originally Posted by Many330i View Post
Have you ever changed any of your bushings?

Start with your RTAB's asap then change those rear shocks..
Quote:
Originally Posted by redbull 325is View Post
i'm going to say you have some issue with either your rear subframe (being a 99 it'll qualify for a free fix in case it's ripped off the body) or maybe a disconnected front sway bar... bad FCABs won't do that. put your car in the air (jackstands/lift) and start tugging on your wheels and see what is loose.
Nope.. The bushings and suspension are completely stock.

Sweet! There was a recall for my model?.. Maybe Its that and I can get it for free..
I really have to find the problem though.. It gets pretty scary.
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Old 07-10-2011, 05:27 PM   #5
dmax
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Originally Posted by Eric_e46 View Post
Nope.. The bushings and suspension are completely stock.

Sweet! There was a recall for my model?.. Maybe Its that and I can get it for free..
I really have to find the problem though.. It gets pretty scary.
Subframe settlement period is over, but that doesn't mean you can't try to make a new federal case out of it.

But, it could just be shocks that are an issue causing your rear end to bounce out, and frankly, it could just be the road and the speed you're entering turns at.

I'm glad you're slowing down when you feel out of control...that's a promising sign!

As far as the 'car moving forward' when braking...that sounds pretty much like the control arm bushings. FYI, there may be an M CAB that would work for you and it's a little more durable...stiffer, but not as stiff as poly.

Finally, check everything, as we don't really know what it is...but, if you're on the gas in a turn that has bumps, I'd expect the rear to push out...and frankly, the front too. Also, simple thing, make sure your tire pressure is very close to what the door jamb says it should be...tire pressure is the foundation of the rest of the suspension geometry, and little changes in it affect the handling considerably! I add just 2 lbs. to the front (riding on the higher side of psi in the front, and near the bottom for the rear and I've got perfectly neutral steering...just enough to steer nicely with throttle when I need/want to.

If you're running 45psi in back, that might be your problem entirely...idk what you have, so not accusing you...just saying!
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Old 07-10-2011, 06:04 PM   #6
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Maybe take it to a competent BMW shop to have a look? That could just be crazy talk, but maybe it's worth a shot.
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Old 07-10-2011, 10:59 PM   #7
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maybe...take it to a different section of the forums?

AKA not the for sale section
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Old 07-10-2011, 11:28 PM   #8
Milz328
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I just got back from road trip to boston and i noticed that im having a similar issue let me know if u figure out what it is
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Old 07-11-2011, 01:34 PM   #9
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IMO sounds like a bushing problem. My car was doing the exact same thing when mines were out. Every bump or imperfection in the road at high speeds would cause my car to swerve slightly. After i changed my front control arm bushings, the car was solid. Try changing that first before digging deeper.
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Old 07-12-2011, 11:04 AM   #10
Eric_e46
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IMO sounds like a bushing problem. My car was doing the exact same thing when mines were out. Every bump or imperfection in the road at high speeds would cause my car to swerve slightly. After i changed my front control arm bushings, the car was solid. Try changing that first before digging deeper.
How can I know which bushings are the ones I need?.. Front or back? And where can I buy them at?
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Old 07-12-2011, 09:18 PM   #11
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Most likely your rtabs. Your problem is in the rear since your car is drifting. Had the same issue with my e46 m. Have them checked.


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Old 07-13-2011, 03:50 PM   #12
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time to change your tires, perhaps?
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