Bump steer. Steering issue

LanDzia · 10-01-2023, 02:16 PM

E90 330i 2006 (late 2005 build).

I've been having bump steer (steering on its own left or right when going through various road imperfections).
Put the car on the lift multiple times, inspected with my mechanic all front suspension parts ... Bottom & upper arms, tie rods are looking perfect. Absolutely 0 play, all joins with no cracks or anything.
I've replaced both upper control arms in the past as they were shot, done alignment with no success.

I'm in the dark. No clue what could be the issue.

My mechanic thinks it might be steering rack itself, although he isn't 100% sure.
Also, I do not have any other issues with steering (except its a bit heavy, but I think it's normal. Changed power steering reservoir and fluid recently).
Actually, at high speed (90+ miles/h) car isn't stable anymore. It feels like there's a little play. This is likely related.

Any ideas anyone? Any experiences?

Hoody007 · 10-01-2023, 04:16 PM

What are your alignment settings?

LanDzia · 10-01-2023, 04:26 PM

Name: 20231001_212148.jpg
Views: 237
Size: 261.7 KB

Quote:

Originally Posted by Hoody007

What are your alignment settings?

Hoody007 · 10-01-2023, 09:30 PM

Hmmm. Those look good to me. What condition are your shocks in?

LanDzia · 10-02-2023, 02:51 AM

Quote:

Originally Posted by Hoody007

Hmmm. Those look good to me. What condition are your shocks in?

Honestly I'm not 100% sure. My mechanic told me they're OK and no need to change, however I feel these are original ones.
You think they might have relation?

AWD Addict · 10-02-2023, 02:04 PM

That's a likely culprit. Those would be pretty old if they're still original.

Hoody007 · 10-02-2023, 02:12 PM

Quote:

Originally Posted by LanDzia

Honestly I'm not 100% sure. My mechanic told me they're OK and no need to change, however I feel these are original ones.
You think they might have relation?

I’ve had bump steer issues fixed with new shocks in the past. Another good way to tell is by looking at your bump stops. If they’re rotting/worn away, it’s a good indication that you’re due for new dampeners.

The Nightman · 10-02-2023, 11:49 PM

2006 model year with 95k mile dampers? You'll likely benefit from new struts and shocks

LanDzia · 10-03-2023, 04:30 AM

Quote:

Originally Posted by The Nightman

2006 model year with 95k mile dampers? You'll likely benefit from new struts and shocks

I'm not sure as I haven't seen any receipt from previous owners for new ones.
I guess it's time to inspect it properly myself.

LanDzia · 11-12-2024, 01:33 PM

EDIT:
Replaced:
- Front wheels about 6 months ago (michelin pilot sport 4 zero pressure (run flats). Rears are same Bridgestone potenzas on about 4mm thread.
- Front & Rear Struts (Bilstein B4 M sport)
- Springs (Eibach Pro Kit)
- all associated parts when refreshing shocks (all mounts, bump stops etc. both ends)
- Inner & outer tie rods
- done four wheel alingment

Bumpsteer improved, however it's still there! What a bummer.
No other visible issue with any other suspention component.

What now? I feel like I've hit a wall.

10-01-2023, 02:16 PM	#1
LanDzia Enlisted Member 23 Rep 46 Posts Drives: E90 330i Join Date: Jun 2023 Location: UK iTrader: (0)	Bump steer. Steering issue E90 330i 2006 (late 2005 build). I've been having bump steer (steering on its own left or right when going through various road imperfections). Put the car on the lift multiple times, inspected with my mechanic all front suspension parts ... Bottom & upper arms, tie rods are looking perfect. Absolutely 0 play, all joins with no cracks or anything. I've replaced both upper control arms in the past as they were shot, done alignment with no success. I'm in the dark. No clue what could be the issue. My mechanic thinks it might be steering rack itself, although he isn't 100% sure. Also, I do not have any other issues with steering (except its a bit heavy, but I think it's normal. Changed power steering reservoir and fluid recently). Actually, at high speed (90+ miles/h) car isn't stable anymore. It feels like there's a little play. This is likely related. Any ideas anyone? Any experiences?
	Appreciate 0 Tweet Quote

10-01-2023, 04:16 PM	#2
Hoody007 Major 1652 Rep 1,275 Posts Drives: 335i ZMZ LCI \| 850i/6 Join Date: Apr 2018 Location: Dunwoody, GA & Boston, MA iTrader: (0)	What are your alignment settings?
	Appreciate 0 Quote

10-01-2023, 09:30 PM	#4
Hoody007 Major 1652 Rep 1,275 Posts Drives: 335i ZMZ LCI \| 850i/6 Join Date: Apr 2018 Location: Dunwoody, GA & Boston, MA iTrader: (0)	Hmmm. Those look good to me. What condition are your shocks in?
	Appreciate 0 Quote

10-02-2023, 02:04 PM	#6
AWD Addict Chief Executive 387 Rep 2,919 Posts Drives: 2008 335xi 6spd Coupe Join Date: Dec 2007 Location: Boston iTrader: (1) Garage List 2008 335xi [0.00]	That's a likely culprit. Those would be pretty old if they're still original.
	Appreciate 0 Quote

10-02-2023, 11:49 PM	#8
The Nightman Cometh 1236 Rep 1,406 Posts Drives: Boy's Soul Join Date: Jul 2016 Location: Boy's Hole iTrader: (4) Garage List E90 LCI "330i& ... [10.00]	2006 model year with 95k mile dampers? You'll likely benefit from new struts and shocks
	Appreciate 0 Quote

11-12-2024, 01:33 PM	#10
LanDzia Enlisted Member 23 Rep 46 Posts Drives: E90 330i Join Date: Jun 2023 Location: UK iTrader: (0)	EDIT: Replaced: - Front wheels about 6 months ago (michelin pilot sport 4 zero pressure (run flats). Rears are same Bridgestone potenzas on about 4mm thread. - Front & Rear Struts (Bilstein B4 M sport) - Springs (Eibach Pro Kit) - all associated parts when refreshing shocks (all mounts, bump stops etc. both ends) - Inner & outer tie rods - done four wheel alingment Bumpsteer improved, however it's still there! What a bummer. No other visible issue with any other suspention component. What now? I feel like I've hit a wall. Attached Images
	Appreciate 0 Quote