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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 12-08-2011, 08:03 AM
KeithS KeithS is offline
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Location: Central NJ
 
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Posts: 1,650
Mein Auto: '11 335d, '00 540iT
So what pump/motor is running under the hood

As soon as my d wakes up (open door), there is something running under the hood. It also continues to run for many minutes after the car is shut off. I think it's the aux water circulating pump but have no idea why it would be running. Does this happen to your d? It's not very loud but something is running.
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  #2  
Old 12-08-2011, 08:16 AM
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floydarogers floydarogers is offline
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Location: Renton, WA
 
Join Date: Oct 2010
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Mein Auto: 335d, 328d, Toyota T100
Vacuum pump?

Could well be the vacuum pump running in anticipation of starting.
Lots of pumps on these cars.
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Old 12-08-2011, 08:26 AM
KeithS KeithS is offline
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Mein Auto: '11 335d, '00 540iT
Didn't think about the vacuum pump, but believe it's mechanically driven (that cylinder looking thing on the front of the engine?). But does everyone else's do this?
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Old 12-08-2011, 08:31 AM
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bimmerdiesel bimmerdiesel is offline
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Location: Bedford MA
 
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Mein Auto: 335d
no idea what pump it is. I thought its some kind electronic equipment. I also know its not specific to d. Coz it also happens in 335i and 328i.
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Old 12-08-2011, 09:30 AM
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floydarogers floydarogers is offline
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Location: Renton, WA
 
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Mein Auto: 335d, 328d, Toyota T100
Quote:
Originally Posted by KeithS View Post
Didn't think about the vacuum pump, but believe it's mechanically driven (that cylinder looking thing on the front of the engine?). But does everyone else's do this?
You're right, the vacuum pump is on the exhaust camshaft.

Just went down for the paper - opening the door starts what sounds like an electronics (ECU) cooling fan on the right side firewall. Something else going when shutdown. I've heard them both before. And last night when I came home and unloaded the trunk, sounded like the SCR transfer pump was running after shutoff.
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Old 12-09-2011, 10:20 PM
Snipe656 Snipe656 is offline
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Location: Humble, Tx
 
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Mein Auto: 2009 335d
Only sound I ever notice before turning on the car is the sound that reminds me of a computer booting up. Seems like it happens as soon as a door or trunk is opened and eventually if the engine is not started it sounds like a computer shutting down. I can't remember if the 328i loaner cars did it or not but always wondered if it maybe was the cause for some people's battery drain issues.
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Old 12-10-2011, 07:09 AM
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Flyingman Flyingman is offline
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Location: Miami
 
Join Date: Sep 2009
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Mein Auto: 335d
Yes, I have heard a number of different sounds, both when entering the car and then when getting out.

I've heard the electric cooling fan for the radiator when I shutdown, that is normal.

I've heard the fuel transfer pump or something like that in the rear of the car both when starting up and shutting down. Also normal.

I think I've heard something related to the DPF when I shutdown, that is very sporadic so assume perhaps it was in middle of it's cycle when I shutdown. Expect that is also normal.

Can't say I have heard anything abnormal other than the loud squeal of the fan belt, which has now been resolved with the new belt, thank you very much.
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Old 12-10-2011, 07:55 AM
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Stevarino Stevarino is offline
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Location: Annapolis, MD
 
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Mein Auto: 2008 335 / 2014 X-3
It is the computer

Every time I get into the car where it is in a quiet location, I hear the car hard drive spinning up.
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