SBC buzzing noise with engine off
Thread Starter
Junior Member
Joined: Apr 2007
Posts: 39
Likes: 0
From: Chandler, AZ
06 R500 / 03 CLK430 Conv
SBC buzzing noise with engine off
I've noticed that with my key turned to the final position before starting the engine, that my SBC unit is making a whurring / buzzing noise. I've read all about the various noises that SBC makes, but is it right that this noise continues for as long as the key is in that position?
I thought the noise might come on when the driver's door was opened, or last a few seconds after switching the ignition, but this noise just carries on?
Thanks in advance.
I thought the noise might come on when the driver's door was opened, or last a few seconds after switching the ignition, but this noise just carries on?
Thanks in advance.
Thread Starter
Junior Member
Joined: Apr 2007
Posts: 39
Likes: 0
From: Chandler, AZ
06 R500 / 03 CLK430 Conv
I've just looked a bit closer, the noise is coming from a black 'thingy' in front of the sbc pump. It has two pipes and an electrical connection. The writing on it says Bosch PAD 12v. What's that?
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Joined: Jul 2003
Posts: 15,901
Likes: 4,632
From: North Scottsdale, AZ
'71 Pinto
I've noticed that with my key turned to the final position before starting the engine, that my SBC unit is making a whurring / buzzing noise. I've read all about the various noises that SBC makes, but is it right that this noise continues for as long as the key is in that position?
I thought the noise might come on when the driver's door was opened, or last a few seconds after switching the ignition, but this noise just carries on?
Thanks in advance.
I thought the noise might come on when the driver's door was opened, or last a few seconds after switching the ignition, but this noise just carries on?
Thanks in advance.
Under warranty:
Mention DTB P-B-42.46/27e the single suction damper is being replaced by a suction hose with integral double suction dampers (part # A2114208826). In the process, they will bleed the SBC system with Star Diagnosis.
Out of warranty:
Make sure all service campaigns and recalls have been applied to your vehicle, have the SA check your VIN in VMI. Normally only service campaigns and recalls do not expire - honored always. DTBs are only honored under warranty and/or extended warranty. However, in this case a part was modified for better brake performance (i.e.: eliminate noise) therefore, it may be worth your while to request a no cost goodwill repair from dealer and MBUSA.
If you want a copy f the DTB to present to your SA private mail your email address.
Last edited by konigstiger; Nov 18, 2008 at 11:15 AM.
Thread Starter
Junior Member
Joined: Apr 2007
Posts: 39
Likes: 0
From: Chandler, AZ
06 R500 / 03 CLK430 Conv
I did a bit more research and it's not related to SBC. It's the coolant recirculating pump. I think it is related to the REST feature, that I've never used.
I'd never noticed this pump running when the engine wasn't before. I found some articles that suggested it would run for a while after the engine has been running to prevent hot spots, that sounds fair enough. I'm going to see if the pump runs when the engine is cold, if it does, then that's daft.
I'd never noticed this pump running when the engine wasn't before. I found some articles that suggested it would run for a while after the engine has been running to prevent hot spots, that sounds fair enough. I'm going to see if the pump runs when the engine is cold, if it does, then that's daft.
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Newbie
Joined: Nov 2005
Posts: 7
Likes: 1
From: oeiras, portugal
2002 W211 E220CDI classic silver
I'm looking for the reason why my w211 220cdi does not start. in fact that pumps runs too much time when the key is turned (before ignition). is there any possibility of having a leakage in the pipes? do you have any scheme showing that circuit?
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From: Europe
223.168 & 213.012 & 906.633 & 214.005
You should be able to check the brake system pipes for leakage but if that was the case, you would also see it from the fluid reservoir. It must be more internal leak from the SBC pump valves.
The SBC brake system spare parts are the same as on other models (brakes may be different). If you look at EPC, you can find the right part for your car and also see which other models use the same part.
A bit outdated EPC copy hosted by this Russian site if you cannot have on-line access:
http://www.detali.ru/cat/oem_mb0.asp?TP=1
