High pitched noise in engine

[MaccaTSI]

Hey guys,

Can anyone tell me what this noise in my engine is? I just started changing my bulbs to Osram Nightbreakers, I got one done, but when I put the lights on to check it was working I heard this noise coming from the back of the engine.

Not sure if it was there before because I've never had the bonnet up with the keys in.

Can anyone tell me what it is and whether it's normal??

http://www.youtube.com/watch?v=4Olvdpg8T20

Thanks!!

[nicandlance]

Sorry, I've got nothing to say but........... that's weird!

[MaccaTSI]

That's what I thought, I thought it was a dodgy bulb as I've heard whining noises from dodgy bulbs before (not that loud tho) but it's coming from the right hand side/back of the engine bay and I put the bulb in the left headlight.....

[GTom]

I believe that's a noise from the ecu.

[Paul_OH]

I have the same, I thought it was a fuel pump priming or something. Is is there all the time or does it go after 30sec to 1 min?
It could also be the coolant pump running for a few minutes after engine shutdown to keep the turbo cool.
So many things but I've had it since day zero

[MaccaTSI]

I believe that's a noise from the ecu.

Where in the engine bay is the ECU located?

I have the same, I thought it was a fuel pump priming or something. Is is there all the time or does it go after 30sec to 1 min?
It could also be the coolant pump running for a few minutes after engine shutdown to keep the turbo cool.
So many things but I've had it since day zero

Yeah I was thinking it was a pump priming or something, but there were a few clicking and whining noises that went away but that one stayed around. Does the noise your car makes hang around or go away after 1min?

The engine was still quite warm so hopefully it's just something doing some cooling.... or something?? I'll have a look in the morning after it's sat overnight and see if it happens when I first turn it on.

If anyone knows what it is though, please let me know!!

[mtj007]

My Mk 5 TDI does it and so did my mum's 2007 Passat TDI. My dad's Mk 6 TDI doesn't No idea what it is

[MaccaTSI]

Hmmm it's weird, sounds like there's a few cars that do it.

Anyone with a 118 that's noticed it

Still there this morning, so assuming it's always been there and there isn't actually anything wrong. Might just ask the dealer next time I'm down there

[Skoda Convert]

I had a technician tell me that a dial up modem type noise coming from the engine bay when i stopped driving was due to the electronic throttle body readjusting or something like that. It sounded plausable and knowing sweet FA about these things i never took it any further. Yours sounds similar pitched but at one tonal level and louder so may not be the same thing

Car didn't blow up though so it can't be all that bad?!

[Coaster]

How about switching the bulbs back to stock and listen again, then we'll know if it's the bulbs or not.