Steering pump/rack noise? Help diagnose! - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 19 Old 23rd May 2019, 03:55 PM Thread Starter
TexaZ3
Member, P500 Sport, MDM on (>800)
 
TexaZ3's Avatar
 
Join Date: Oct 2009
Location: Fort Worth, TX
Posts: 857
Thanks: 50
Thanked 72 Times in 68 Posts
Steering pump/rack noise? Help diagnose!

All right M5Board forum - my luck with my beast being trouble free appears to be over. Over the last couple of days, I noticed my steering pump (or maybe rack) making this screeching noise when I turn the wheel - only happens when I actually move the wheel - no noise when idle. I can feel slight resistance in the wheel, as if something is catching there. Please see video below for sound.



This is way more pronounced in the morning after the car has been sitting overnight, after I drive it for a short period of time, the noise "almost" goes completely away for the rest of the day - I still hear some, but much much more faint. It almost feels that something gets the oil/fluid it needs and stops being grouchy

I had a seeping leak from my steering expansion tank for a while now (typical few drops a week, nothing serious) but the tank is full. So any pointers before I start taking stuff apart and ordering parts would be appreciated.

E36 1999 M3 Coupe Dakar Yellow/Black Vaders
E36 2000 M Coupe Cosmos Black/Black Leather, Shark, Conforti CAI, B&B Exhaust, H&R, Bilstein.
E39 2000 M5 Imola/Black Heritage
E46 2005 M3 Coupe ZCP Carbon Black/Black
E63 2006 M6 Coupe Indianapolis Red/Black/Madeira, Style 343

Last edited by TexaZ3; 23rd May 2019 at 04:23 PM.
TexaZ3 is offline  
Sponsored Links
Advertisement
 
post #2 of 19 Old 23rd May 2019, 03:59 PM
sreten
Member, Sport: On DSC: Off
 
sreten's Avatar
 
Join Date: Apr 2016
Location: Frankfurt, Germany
Posts: 201
Thanks: 57
Thanked 43 Times in 40 Posts
When was the last time the power steering fluid was flushed? If it looks like coffee and has a burnt smell to it, I'd start by replacing the fluid.
sreten is online now  
post #3 of 19 Old 23rd May 2019, 04:20 PM Thread Starter
TexaZ3
Member, P500 Sport, MDM on (>800)
 
TexaZ3's Avatar
 
Join Date: Oct 2009
Location: Fort Worth, TX
Posts: 857
Thanks: 50
Thanked 72 Times in 68 Posts
Quote:
Originally Posted by sreten View Post
When was the last time the power steering fluid was flushed? If it looks like coffee and has a burnt smell to it, I'd start by replacing the fluid.
Fluid is clear red, does not smell burnt. I guess I could flush it, doesn't cost much. I don't think that's the problem, however, based on the fact that the noise goes mostly away with driving. It almost feels like something is not getting enough fluid after sitting, and then once it gets going, it gets its fix. Maybe bad expansion tank/filter? I do have some fluid seeping from the weep hole on the top.

E36 1999 M3 Coupe Dakar Yellow/Black Vaders
E36 2000 M Coupe Cosmos Black/Black Leather, Shark, Conforti CAI, B&B Exhaust, H&R, Bilstein.
E39 2000 M5 Imola/Black Heritage
E46 2005 M3 Coupe ZCP Carbon Black/Black
E63 2006 M6 Coupe Indianapolis Red/Black/Madeira, Style 343
TexaZ3 is offline  
 
post #4 of 19 Old 23rd May 2019, 05:02 PM
sreten
Member, Sport: On DSC: Off
 
sreten's Avatar
 
Join Date: Apr 2016
Location: Frankfurt, Germany
Posts: 201
Thanks: 57
Thanked 43 Times in 40 Posts
Maybe not a bad idea to replace the lines to address the leak and chuck in a new reservoir while at it. If it turns out that the pump is bad then you'd want to do that anyways.
sreten is online now  
The Following 2 Users Say Thank You to sreten For This Useful Post:
TexaZ3 (23rd May 2019)
post #5 of 19 Old 23rd May 2019, 05:51 PM Thread Starter
TexaZ3
Member, P500 Sport, MDM on (>800)
 
TexaZ3's Avatar
 
Join Date: Oct 2009
Location: Fort Worth, TX
Posts: 857
Thanks: 50
Thanked 72 Times in 68 Posts
Quote:
Originally Posted by sreten View Post
Maybe not a bad idea to replace the lines to address the leak and chuck in a new reservoir while at it. If it turns out that the pump is bad then you'd want to do that anyways.
Yeah, I don't mind replacing the lines/reservoir - meant to do it anyway. Just wanted to see if this is the pump before I get the new one (they are not that cheap), and go through the trouble of replacing. These are not really known to fail, at least I don't think so. Is there a sure-fire way to tell if this is the pump?

E36 1999 M3 Coupe Dakar Yellow/Black Vaders
E36 2000 M Coupe Cosmos Black/Black Leather, Shark, Conforti CAI, B&B Exhaust, H&R, Bilstein.
E39 2000 M5 Imola/Black Heritage
E46 2005 M3 Coupe ZCP Carbon Black/Black
E63 2006 M6 Coupe Indianapolis Red/Black/Madeira, Style 343
TexaZ3 is offline  
post #6 of 19 Old 23rd May 2019, 06:43 PM
xrviz
M5 Guru (>2000 posts)
 
xrviz's Avatar
 
Join Date: Nov 2014
Location: Oklahoma
Posts: 2,289
Thanks: 255
Thanked 236 Times in 219 Posts
The pump turns with the engine, the steering box turns with the wheel. I would think if the sound is only when you turn the wheel it is either the box or rack, not the pump.
xrviz is offline  
post #7 of 19 Old 23rd May 2019, 07:30 PM
kiznarsh
Senior Member (>500)
 
kiznarsh's Avatar
 
Join Date: Dec 2016
Location: SoCal
Posts: 503
Thanks: 19
Thanked 43 Times in 41 Posts
Quote:
Originally Posted by xrviz View Post
The pump turns with the engine, the steering box turns with the wheel. I would think if the sound is only when you turn the wheel it is either the box or rack, not the pump.

But the pump is only under load when steering, right? Because when my pump went bad, I could only hear the noise and a slight wheel vibration when I turned the wheel.


I suspect the noise goes away after a while as the fluid heats up and becomes less viscous.


I think it's the pump based on the video.

'03 M5 | 987.2 Cayman | @kian.ski
kiznarsh is offline  
post #8 of 19 Old 23rd May 2019, 08:00 PM
Sailor24
M5 Expert (>4000)
 
Sailor24's Avatar
 
Join Date: Oct 2010
Location: Cobourg Ont
Age: 57
Posts: 9,723
Thanks: 986
Thanked 1,967 Times in 1,651 Posts
Sounds like air in the system? Do you have any leaks? Is your breather hole plugged? Are your lines weeping? If your lines are weeping maybe air can get sucked in cold but as they heat up they sort of seal, all I got?
Sailor24 is offline  
post #9 of 19 Old 23rd May 2019, 08:21 PM Thread Starter
TexaZ3
Member, P500 Sport, MDM on (>800)
 
TexaZ3's Avatar
 
Join Date: Oct 2009
Location: Fort Worth, TX
Posts: 857
Thanks: 50
Thanked 72 Times in 68 Posts
Something is leaking, like I mentioned - but I have not figured out what exactly, yet. I guess the plan would be to get new hoses, reservoir, and ATF and replace those and the fluid first, and if that doesn't fix it, replace the pump?

What does everyone use for fluid? Just ATF (Dexron VI?) or something fancy like Pentosin CHF 11S? Is there even a difference?

E36 1999 M3 Coupe Dakar Yellow/Black Vaders
E36 2000 M Coupe Cosmos Black/Black Leather, Shark, Conforti CAI, B&B Exhaust, H&R, Bilstein.
E39 2000 M5 Imola/Black Heritage
E46 2005 M3 Coupe ZCP Carbon Black/Black
E63 2006 M6 Coupe Indianapolis Red/Black/Madeira, Style 343

Last edited by TexaZ3; 23rd May 2019 at 08:26 PM.
TexaZ3 is offline  
post #10 of 19 Old 23rd May 2019, 08:53 PM
Bojangles
Member, Sport: Off DSC: On (>50 posts)
 
Bojangles's Avatar
 
Join Date: Nov 2017
Posts: 65
Thanks: 5
Thanked 6 Times in 6 Posts
My car made that kind of noise after I replaced the lines and reservoir, but did not properly bleed the system. Try turning the wheel lock to lock while the engine is off and the reservoir cap is off. Then turn the car on and see if the noise goes away. If that helps, but the car still makes noise at next startup after sitting for an extended period of time, it's probably taking on air somehow when cold.
Bojangles is online now  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Noise on startup - power steering pump bracket Snowbeast E39 M5 and E52 Z8 Discussion 2 7th June 2013 07:24 AM
Press Release and official pictures (BMW M5 F10 Concept) Gustav F10 M5 Discussion 98 7th June 2012 05:36 PM
Steering noise, "creek!" nixter E39 M5 and E52 Z8 Discussion 18 31st August 2011 10:09 PM
Interior ventilation fan noise - related to steering? SleeperE39 E39 M5 and E52 Z8 Discussion 18 6th July 2009 08:45 PM
Autocar: M5 beats Ferrari F430 Just_me E60 M5 and E61 M5 Touring Discussion 204 10th October 2007 04:24 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome