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1999 S600 Sedan, 1999 S600 w/ 4-pl seating, 1995 S600 Coupe, 2-1992 600SEL's, 2002 ML55, 1998 SL600
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2,424 Posts
Discussion Starter #1
On cold start the past two days, my 1999 Sedan made an unusual growl that seemed to be made louder when turning the steering wheel. At least it changed pitch. This new noise seemed to dissipate after about 45-seconds and normalcy resumed.

Any ideas what it could be? If a bad power steering pump, why would the noise go away after a short time?

Again, it does NOT stay on, has only presented itself at startup and only then for a short period.

Thanks!
 

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1999 S500 (W140)
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170 Posts
Someone else brought this up recently, i think its your smog pump,, some kind of motor that pumps air into your exhaust,,, they seem to make more noise when its cold out...

hope this helps
 

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Premium Member
1999 S600 Sedan, 1999 S600 w/ 4-pl seating, 1995 S600 Coupe, 2-1992 600SEL's, 2002 ML55, 1998 SL600
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2,424 Posts
Discussion Starter #4
Thanks, Assman!

Seinfeld afficianado? Or a proctologist?
 

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Premium Member
1999 S600 Sedan, 1999 S600 w/ 4-pl seating, 1995 S600 Coupe, 2-1992 600SEL's, 2002 ML55, 1998 SL600
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2,424 Posts
Discussion Starter #5
Problem Found!

Just when all was quiet, this morning on start-up the growl was back, louder than before. Gradually, the noise went away 10-minutes into my 20-minute commute.

All of a sudden, the power steering is lost and I'm driving with the effort needed to turn a tank. Like nothing ever experienced before. Literally, needed two hands to make a 90-degree turn. Forget about trying to parallel park.

Anyway, prognosis: The power steering pump crapped out, big time. Let loose with power steering fluid all over the engine compartment.

Oh well, it'll be fixed soon enough.
 

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Premium Member
1999 S600 Sedan, 1999 S600 w/ 4-pl seating, 1995 S600 Coupe, 2-1992 600SEL's, 2002 ML55, 1998 SL600
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2,424 Posts
Discussion Starter #7
Nope, the car was just out from a full service, with all fluids checked. I picked it up on Saturday, the PS pump blew on Monday morning on the way in to the office.
 

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I think I may be having the same problem with my 2006 ML350. The pump hasn't crapped out on me, but I have the same noise on start-up which gets louder when I turn my wheels. Do you have an estimated cost for the repair?
 

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Premium Member
1999 S600 Sedan, 1999 S600 w/ 4-pl seating, 1995 S600 Coupe, 2-1992 600SEL's, 2002 ML55, 1998 SL600
Joined
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2,424 Posts
Discussion Starter #9
Not sure the costs for the ML, but the costs for the W140 are: new Power Steering pump: $1500 (none available), used/MB reconditioned w/ 1-year warranty: $654, fresh fluids, bleed system (connected to the suspension system in the W140), 2-hours labor.

Power steering pumps RARELY blow, or so I'm told. My PS fluid was topped off just two days before, so it wasn't low on fluid.

Who knows...shmeg in the system? Kink in the line? The mystery, my friend, continues....
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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7,639 Posts
Nope, the car was just out from a full service, with all fluids checked. I picked it up on Saturday, the PS pump blew on Monday morning on the way in to the office.
Sad to hear that Stryker ,i know how you feel about your Car beeing always Spotless & Perfect .
That's why they insist with the Warranty (other previous new thread) ,Bring the Car in for Service and they make sure you get it back with some sort of a Problem .
Blame the Dealer who done the Service on your Car somehow ,you may get lucky .
Ciao :thumbsup:
 

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Premium Member
1999 S600 Sedan, 1999 S600 w/ 4-pl seating, 1995 S600 Coupe, 2-1992 600SEL's, 2002 ML55, 1998 SL600
Joined
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2,424 Posts
Discussion Starter #11
I had brought it in to the dealer because I heard this noise on startup and they insisted I bring it in to determine the cause. Because the car made the noise on startup, they needed the car overnight. And they found nothing wrong! No noise (it didn't happen all the time), nothing wrong, no charge for the diagnosis. Detailed upon delivery.

Since I have a brass plaque on my own service bay at the dealership (not really, but they should, like they do in the hospitals), I don't think they fudged with the car. And they only allow their top-notch (A-level) master mechanics work on my stuff, so I wasn't being used for training materials, I'm sure.

Just one of those things?? Perhaps!
 

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Not sure the costs for the ML, but the costs for the W140 are: new Power Steering pump: $1500 (none available), used/MB reconditioned w/ 1-year warranty: $654, fresh fluids, bleed system (connected to the suspension system in the W140), 2-hours labor.

Power steering pumps RARELY blow, or so I'm told. My PS fluid was topped off just two days before, so it wasn't low on fluid.

Who knows...shmeg in the system? Kink in the line? The mystery, my friend, continues....
Thanks for the response! It was my power steering pump. I had to get it replaced, but thankfully I had a service contract that covered the repairs.
 
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