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Old 03-31-2011, 03:10 AM   #1
islanq
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Possible Power Steering Pump Failure?

Driving in town and about to make a left hand turn at a signal light. I notice a tiny rumble/vibration when turning the wheel then it goes away. I pass my destination (stupid POS Magellan) and turn into a residential to make a "u" turn and go back.

All of a sudden, the car start vibrating really hard through the steering wheel. I pulled over and shut down the car. Turn it back on, idle is fine and smooth, no CEL, temp is good, etc... I put the car in gear and start to turn the wheel to move away from the curb and the vibration returns heavily and the engine area is making a semi loud almost "thud" noise rapidly (only when the wheel is turned even slightly).

I pop the hood and check, no leaks or anything. Check the power steering res. and it's at perfect operating level. The belts are spinning on the pulleys freely.

When I turn the wheel I feel like I have assist but the rapid "thud" type sound that ensues when I turn the wheel scares me too much to really try.

Long story short I left my car parked across town because a random girl happen to be driving by who offered to give me a ride.

Has anyone had this happen? I replaced the whole steering rack within the last 1,000 miles (new ATF added and properly bled). Car has been running great and steering felt great, no precursor signs.

Ugh, on a side note, I offered the girl $10 for gas and being so nice to help a stranded motorist, she declined and said I should take her to dinner next week in my car when it's running again. Soooooooo, overall it wasn't 100% bad. I'd still like to know what's going on though.

Last edited by islanq; 03-31-2011 at 03:16 PM.
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Old 03-31-2011, 07:05 AM   #2
snowborder142190
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Well I am not sure if it has failed but we can check. Get a friend, or maybe the girl that helped you out, to turn the wheel while listen in the engine bay for the sound. See if it is coming from the pump area. If you still have power steering it would make me think that the pump is still working. Check everything while someone turns the wheel. Check the rack an see if somehow it has gotten loose.


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Old 03-31-2011, 02:17 PM   #3
too_desi
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Pump running dry perhaps?

I had the same issue (my car was sitting in snow for a few days) and i had the same loud noise when turning the wheel.

I somehow drove it down to the indy and it was the P/S pump allright. The drive was fine in a straight line or with minimum wheel turn. It didnt feel like it was hard to turn the wheel, but when making a full (left/right) turn, it would start moaning.

ended up upgrading to a used LF-30 from the junk yard + new P/S hoses

did set me back about $600 (parts + labour)

It's a scary noise when you don't know what it is.
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Old 03-31-2011, 03:16 PM   #4
islanq
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Quote:
Originally Posted by too_desi View Post
Pump running dry perhaps?

I had the same issue (my car was sitting in snow for a few days) and i had the same loud noise when turning the wheel.

I somehow drove it down to the indy and it was the P/S pump allright. The drive was fine in a straight line or with minimum wheel turn. It didnt feel like it was hard to turn the wheel, but when making a full (left/right) turn, it would start moaning.

ended up upgrading to a used LF-30 from the junk yard + new P/S hoses

did set me back about $600 (parts + labour)

It's a scary noise when you don't know what it is.
Thanks for the info! I have had low fluid in my res and can tell you it's a completely different sound then when the PS pump is struggling to get fluid. I have never heard a noise like this before.
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Old 03-31-2011, 04:01 PM   #5
iansanderson
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It's the PS pump if it varies with steering.

get a used one from a low mileage car and save a lot of money.

or check ecs tuning. They have aftermarket LUK LF-20 power steering pumps at a good price. install is easy.
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Cheat Sheet:

GT1/ISIS/MoDiC = Factory authorized diagnostic system used by BMW dealerships across the world.

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DME = Engine Management Computer
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Old 03-31-2011, 04:42 PM   #6
islanq
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Quote:
Originally Posted by iansanderson View Post
It's the PS pump if it varies with steering.

get a used one from a low mileage car and save a lot of money.

or check ecs tuning. They have aftermarket LUK LF-20 power steering pumps at a good price. install is easy.
Thanks for the info, Ian. I live like 20 mins from Bav Auto Recycling and a few other huge auto dismantles. I'll give my buddy a call so he can grab me a low mile pump.

Considering I have done CCV, intake manifold gasket, and a complete steering rack in the past few weeks. Pretty much all installs short of a complete engine rebuilt are seeming easy to me now! Lol

Nice sig BTW.
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Old 04-01-2011, 07:55 PM   #7
islanq
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Quote:
Originally Posted by too_desi View Post
Pump running dry perhaps?

I had the same issue (my car was sitting in snow for a few days) and i had the same loud noise when turning the wheel.

I somehow drove it down to the indy and it was the P/S pump allright. The drive was fine in a straight line or with minimum wheel turn. It didnt feel like it was hard to turn the wheel, but when making a full (left/right) turn, it would start moaning.

ended up upgrading to a used LF-30 from the junk yard + new P/S hoses

did set me back about $600 (parts + labour)

It's a scary noise when you don't know what it is.
UPDATE: I purchased a used OEM LUK LF-30 to replace my current one (which I thought was bad). I turn on my car to gimp it home, everything is FINE! No more rumble, steering moves perfect.

I'm thinking that when I replaced my rack (including hydraulic steering gear box) and drained the res. then put new ATF and bled the system, maybe some gunk or debris moved down and clogged a hose. After the car cooled off (today) the cooled ATF returned upward toward the res. and dislodged the problem area. I'm not going to replace hoses and flush the ATF again to ensure nothing else like this remains in my lines.

On a side note, I have a used OEM LUK LF-30 I just purchased for $230 w/ a 4 month warranty on it. Asking $200 + shipping.

Last edited by islanq; 04-01-2011 at 07:58 PM.
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Old 05-01-2011, 06:55 PM   #8
truajb
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I am hearing some noise when I turn the wheel all the way to left or right. Is this normal? Did you have the same problem?
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Old 05-19-2017, 04:49 AM   #9
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Quote:
Originally Posted by islanq View Post
ugh, on a side note, i offered the girl $10 for gas and being so nice to help a stranded motorist, she declined and said i should take her to dinner next week in my car when it's running again. Soooooooo, overall it wasn't 100% bad. I'd still like to know what's going on though.
braggggg
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Old 05-19-2017, 09:45 AM   #10
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braggggg
Wouldn't you?!
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Old 05-23-2017, 10:07 PM   #11
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Hell yeah!


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