audi a4 whooshing noise

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wangela13 - 07 Nov 2006 17:54 GMT

can someone please help, my car has been looked at a few times, when i
accelerate there is a whoosing noise coming from the front of the car, it
went to get fixed they said the turbo hose had burst then they said they
couldnt find anything wrong with the hoses, it has just had a new air mass
meter fitted because it was losing power, it has got some power back but
feels like there should be more, dont know where this air is escaping
from, it sounds like you have the windows down when accelerating, but it
is definatley coming from under the bonnet.

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Tony - 08 Nov 2006 07:24 GMT

> can someone please help, my car has been looked at a few times, when i
> accelerate there is a whoosing noise coming from the front of the car, it
[quoted text clipped - 4 lines]
> from, it sounds like you have the windows down when accelerating, but it
> is definatley coming from under the bonnet.

There are a number of hoses that the dealer can not see from a casual
inspection. They need to pressure test the system to find a leak.

You should also suspect a broken waste gate actuator. They can be replaced but
need to pull the turbo.

Also might have a bad 710N valve.

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tislammac@gmail.com - 10 Nov 2006 07:16 GMT

Check your blow-off valve. I had that problem on another turbo car.
Probably just an air hose to the bov is loose, or it's time for a new
bov :-)

> > can someone please help, my car has been looked at a few times, when i
> > accelerate there is a whoosing noise coming from the front of the car, it
[quoted text clipped - 10 lines]
>
> Also might have a bad 710N valve.

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Tony - 14 Nov 2006 01:02 GMT

1.8Ts do not have a BOV. Instead they have a 710x recirculator valve that does
not vent to the atmosphere.

> Check your blow-off valve. I had that problem on another turbo car.
> Probably just an air hose to the bov is loose, or it's time for a new
[quoted text clipped - 15 lines]
>>
>>Also might have a bad 710N valve.

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Bill - 14 Nov 2006 02:48 GMT

Check around the drivers seat. Right side, or left side, I forget. It is
used to pull cash out of your pocket. Keeps you broke.
Sorry, could not pass it up.

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please reply to bargerw NO @ SPAM bellsouth.net and remove the NOSPAM

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Arthur Russell - 23 Dec 2006 05:15 GMT

Well, I had a similar experience: hissing/vacuum-like noise, and some
loss of power. If you're in the same boat, then if you read out your ECU
codes, you will see:
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
(note, this does not set the CEL)

Cause for me was a split "vacuum" hose (but sometimes vacuum hoses are
under pressure in these cars. The leak was near where the vacuum lines T
off that feed the N75 boost regulation valve. This causes the boost
pressure to spike. Once that happens, the ECU limits max boost to ~4psi
to ensure no overboost is generated. That results in the crappy power
output.

For my split hose, at idle (when the "vacuum" system really is under
vacuum), just look around a bit. My hose was split so badly it had
collapsed, and hissing noises were pretty evident.

Good luck,
Arthur

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Smog - 28 Dec 2006 20:53 GMT

Did they do a full pressure test on the hoses as a visual check will not
always see any splits !
I will put money on it being a split hose.

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Jim B
http://smogthemog.blogspot.com/
http://tinyurl.com/on3sv

> Well, I had a similar experience: hissing/vacuum-like noise, and some loss
> of power. If you're in the same boat, then if you read out your ECU codes,
[quoted text clipped - 25 lines]
>> from, it sounds like you have the windows down when accelerating, but it
>> is definatley coming from under the bonnet.

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