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Author Topic: Whistling noise under hard acceleration  (Read 2262 times)

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VR4Dave

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Whistling noise under hard acceleration
« on: 13 June 2011, 17:51:25 »
As above really when hoofing it in sport mode get a whistling noise at top of the revs, noise seems to come from the front of the car.
Definately more of a whislte than a screach.
02 2.6 elite.
Any ideas?

TIA
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TheBoy

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Re: Whistling noise under hard acceleration
« Reply #1 on: 13 June 2011, 18:41:19 »
Air leak?
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VR4Dave

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Re: Whistling noise under hard acceleration
« Reply #2 on: 13 June 2011, 19:50:18 »
That's exactly what it sounds like, any ideas where to start looking? only does it at the top end of the rev range.
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Broomies Mate

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Re: Whistling noise under hard acceleration
« Reply #3 on: 13 June 2011, 19:57:07 »
My first thought was an Air Leak, but would that not throw a fault code and EML?
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TheBoy

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Re: Whistling noise under hard acceleration
« Reply #4 on: 13 June 2011, 20:32:25 »
plenum o-rings, bagpipes, icv pipework. anywhere really ;D
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VR4Dave

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Re: Whistling noise under hard acceleration
« Reply #5 on: 13 June 2011, 21:11:42 »
No codes showing, will be having the plenum off for cam cover gaskets / breather work shortly so will have a good rumage. Ta for suggestions.
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VR4Dave

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Re: Whistling noise under hard acceleration
« Reply #6 on: 14 June 2011, 13:56:52 »
car in bits now ready for cam cover gaskets due in on thur. When i took plenum off the really small pipe with a 90 deg rubber on the end under throttle bodies was detatched. Wonder if that was the cause of the whistle.
Will no doubt find out on friday when it's all back together.
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MutantCav

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Re: Whistling noise under hard acceleration
« Reply #7 on: 14 June 2011, 15:59:43 »
Check the little rubber o-ring with the little loop on which seals the long airbox on the plenum where it plugs into the plenum...the loop part often splits...some light grease will help the new one not to split when putting it back...only a couple of quid from Vaux to replace :y
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ninjapirate

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Re: Whistling noise under hard acceleration
« Reply #8 on: 14 June 2011, 16:18:29 »
obviously elves have sneaked in and fitted a turbo, i cant understand why no-ones thought of this, and im no mechanic.
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VR4Dave

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Re: Whistling noise under hard acceleration
« Reply #9 on: 14 June 2011, 21:11:12 »
ummmmmm turbo mig  8-)
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feeutfo

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Re: Whistling noise under hard acceleration
« Reply #10 on: 14 June 2011, 21:18:11 »
What sort if whistle? Kettle whistle? Wizzing whistle? Wheezy whistle?
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VR4Dave

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Re: Whistling noise under hard acceleration
« Reply #11 on: 14 June 2011, 22:05:25 »
as much as the turbo thing was a joke it did actually sound like a turbo spooling up. If i had to choose from your descriptions i'd go for kettle. Sounds like wind noise but definately not as it was not present unless gunning it in sport mode.
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Debs.

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Re: Whistling noise under hard acceleration
« Reply #12 on: 14 June 2011, 22:49:59 »
The dual-ram system kicks in at specific rpm/torque-loading.......might the marked-change in sound/roar of that, be what you`re hearing (at least in part)? :-/
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MutantCav

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Re: Whistling noise under hard acceleration
« Reply #13 on: 14 June 2011, 23:01:14 »
On the above theory could the non connected pipe be to the multiram and as its not connected you can hear it leaking air when it cuts in?
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feeutfo

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Re: Whistling noise under hard acceleration
« Reply #14 on: 14 June 2011, 23:43:48 »
It would be flat as a pancake though, until 4 k or vice versa depending which one.

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