Engine bay noise

[BarryP]

Hi guys
I have a 318ti. I have just noticed that when you turn the engine off there is something that keeps running for about 10 seconds or so then stops, sort of like an electrical humming noise. Just recently this noise has changed to a sort of low pitched scream. I think there is some sort of a problem, can anyone explain? (pardon my ignorance as I am not mechanically minded)
Cheers
Barry

[CirrusSR22]

Mine has always done it. I think it's normal and should be just fine. It's the idle air control valve that's making the noise. I've never figured out why it runs for that little bit after you shut down though.... Anyone know?

[losichu]

what year is your car? I dont think 96 had the control valve like the 95. Check crankcase vent valve if 96 up

[oakley]

most cars do, just always assumed its the cooling/ fans and the electrical componants shutting off as when they're ready! If u just put the key in but dont start the engine (just turn to ignition position) and then turn back and take key out it still ticks and makes the noises....

[gonzeno]

I have a '96 that had the same thing happening. I ended up buying a new one from the dealer at about $150 or so, and thats with the bmwcca discount! So if you can live with the whine for a few seconds after shutdown....Guess I'm to anal and had to change it! LOL

[oakley]

humm maybe i'll change it then was going to after having reading another thread on here about the same part...http://www.318ti.org/forum/showthread.php?t=17749

[oakley]

Can anyone tell me the part number for this? (the Ti's a yr 2000 e36 but I expect all m44 ones are the same?)

[trickiekid]

I noticed mine doing it the other day too. We just got done putting in HID's and heard buzzing, first I thought it was the ballasts then i located the noise coming from area of the intake manifold. It happens any time the key is put into the number 2 position (run)

[oakley]

yup thats the noise!

[oakley]

. I ended up buying a new one from the dealer at about $150 or so, and thats with the bmwcca discount!
What did u replace? A crankcase valve is only a few quid to replace... (real oem at $55 or thereabouts)

[gonzeno]

The idle air control vlave I believe. Two bolts and a gasket and connector.

[oakley]

Doh!! Heres hoping the ccvv does the trick then!! :)

[gonzeno]

I thought it was a sure thing as the noise it was making, and also that the idle was a bit rough. Well, it cured the noise after shut down (also while running, I could hear it). The idle was still alittle rough. Found the ICV valve leaking at the top. Changed it also and now all is well and she is purring like a kitten! $55 also! So I actually had 2 seperate problems with the common denominator being the rough idle.

[oakley]

Is this thing the icv?? If not any ideas what it is??!!! (its the black plug to the right of the screen that i'm talking about...)4353