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2002 W220 S500L, 2007 S211 E320 sport CDi, 1999 R170 SLK 230K Designo with AMG pk, 2007 R171 SLK280
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61 Posts
Discussion Starter #1 (Edited)
Hi all,
hope someone can advise?
Tonight after a short drive in the snow i got stuck on some ice, to get free i lost my patience and put my foot down alternating between reverse and drive (w mode engaged) getting upto around 4000 - 5000 revs while turning steering left to right, i got free but noticed a burning smell along with my steering becoming stiff like power assist dropping out and now when moving wheel left to right it becomes very stiff and assiciated with the whine that you get with low fluid? i checked the fluid level but seems fine?

aditionally i have noticed that the power assist is vertually non existant at idle but above 1000 rpm it feels almost normal but with a very loud whine, this morning i removed the pipe from behined the ps reservoir and drianed some fluid, re filled but no diffrence (fluid smelt burned)

have i killed something??

the car is 2002 S500L with airmatic (which incidently developed a small fault last week that i have not got round to sort - the pressure relief valve or wiring has fault but car has kept hight, not sure if related?)

any help or advice much appriciated as im not looking forward to what i may find in the morning?

Mark
 

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Premium Member
2000 CLK 430 Cabriolet 2003 S500 4Matic 2004 S55 2005 CLK 500 Cabriolet 2008 S 450
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780 Posts
The first thing I would check would be belt tensions. If the smell is burning rubber it could be a belt. Poor tension or burnt belt can result in PS difficulties.
Just a not of advice - losing your patience and abusing a car inevitably ends up in a repair, more often than not, an expensive repair. Good luck on finding the fault and hopefully this loss of temper will be an inexpensive lesson rather than the alternative.
 

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Registered
2002 W220 S500L, 2007 S211 E320 sport CDi, 1999 R170 SLK 230K Designo with AMG pk, 2007 R171 SLK280
Joined
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61 Posts
Discussion Starter #3
Thanks for Reply mrbobby, belt is fine, burning smell was not a rubber smell but think it was fluid?

the power assist is vertually non existant at idle but above 1000 rpm it feels almost normal but with a very loud whine as if the fluid is low? ive checked fluid level and its fine, also drained a bit from resovouir and re topped up but no diffrence?
it was very cold yesterday (-10) is it poss the pump has over run when i was turning lock to lock at high revs and cooked the fluid? (or as i fear cooked the rack :crybaby2: ?)
is it worth trying a full drain and replace of fluid? if so can anyone give guidence on proceedure? (eg where best to drain from? and if need to bleed when re filling?)

and yes i have already learnt not to loose patience but in defence i was on an incline at a junction onto busy roundabout with buses and lorries heading towards me at the time. :eek:

Thanks
Mark
 

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Premium Member
2000 CLK 430 Cabriolet 2003 S500 4Matic 2004 S55 2005 CLK 500 Cabriolet 2008 S 450
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780 Posts
Please accept my apologies. I didn't mean to be critical. It sounds as if you have a cooked power steering pump.

My advise, before wasting time and parts is to take it to good indie and have the problem diagnosted. It is hard to diagnose without being able to see smell etc.

In my experience fluid changes are not very often successful when a problem exists. Fluid changes and other maintenance are to avoid rather than fix problems. Good luck
 

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Registered
2002 W220 S500L, 2007 S211 E320 sport CDi, 1999 R170 SLK 230K Designo with AMG pk, 2007 R171 SLK280
Joined
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61 Posts
Discussion Starter #5
Thanks again mrbobby, please no apology necessary, it was a dumb thing to do and i was just injecting a bit of humour into the thread lol, its puzzling to me that there is no pressure relief or pump restriction to prevent this but i suppose its not expected to go from lock to lock at high revs??

My thought of fluid change was as the fluid is burnt i wondered if the properties of the fluid may have changed causing a reduced hyrolic performance at idle (if that makes sense?) but im guessing along with you that ive cooked the pump or my greater fear was ive damaged the rack?

think your right and its prob time to throw some money at a merc specialist (my usual mechanic is booked up till after the holidays so i'll have a look locally)

Thanks again for your help and i will post the findings just in case anyone else is daft enough to do what i did? lol

Mark
 
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