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Funny humming at idle with air box lid removed...

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Old 02-07-2006, 05:41 AM
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Default Funny humming at idle with air box lid removed...
I noticed the other day when pulling into my garage an odd humming/whistling noise that is kind of hard to describe. It is really loud in a confined space but not so bad in the open. That said it is obvious with the bonnet closed to a passerby at some traffic lights for example.

I tracked it down to induction noise and it disappears with the air box lid back on.

It only happens at idle and when the car is warmed up. I tried changing to a K&N to see if that helped but the noise is still there. I am almost 100% certain that the car didn't do it when I first took the air box cover off 3-4 months ago.

Has anyone got any suggestions as to what may be causing it or is it normal?
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Old 02-07-2006, 05:47 AM
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It's been the subject of many posts similar to yours in the past!

It's perfectly normal.
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Old 02-07-2006, 05:49 AM
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Took the airbox lid off for half an hour the other day, I wasnt impressed with the extra niose it made it also felt u bit more unresponsive? it went straight back on!
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Old 02-07-2006, 05:52 AM
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Mine makes exactly the same noise with the lid off. Loud enough to wake the Mrs when I'm working late.
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Old 02-07-2006, 05:56 AM
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Fit an HKS Induction Kit and the Missus AND the neighbourhood will hear you!!!
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Old 02-07-2006, 05:58 AM
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Yep, it's a normal noise if the lid is off.

I wonder what it is though???
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Old 02-07-2006, 06:00 AM
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You're hearing purely more induction noise from having the lid off...
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Old 02-07-2006, 06:04 AM
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It's the fuel pump apparently.
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Old 02-07-2006, 06:09 AM
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From the front of the car?! I thought the fuel pump was located in the petrol tank?!
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Old 02-07-2006, 06:16 AM
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I posted about this is well when i first got the car and took the lid off.
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