Barney19

Excuse my ignorance, but can anyone tell me what's going on under the bonnet of my 05 WRX PPP every couple of minutes when it makes the sound of 'sucking' air or 'blowing' it out. It's my first turbo/intercooler car and I presume it's to do with that.
Cheers Barney.

flat4_ire

probably your dump valve man, releases air when u ease of throttle, thought u wud know this buying a brand new turbo powered car!?

Barney19

As I said, excuse my ignorance, but I thought it was probably something to do with the turbo/intercooler!! Cheers.

patkin

I reckon its your Air conditioning valve opening and closing

kilo_4que

induction kit.

Is it a continuos sort of noise where u can hear a mild hissing sound. Then i gather it is ure induction kit

Unless you hear the sound when u let go of throttle and end up with a brrrrrrrrmmmm psshhhhhh noise. Then that is ure dump valve

JTaylor

Could be the Ambi-Pure purge kit that comes with the PPP, maybe the exhaust bearing capacitator?

Barney19

I'm lost!!!!!!!

kilo_4que

read my post,

pslewis

Your MAF Sensor is on its way out

Pete

Barney19

It's continues for a couple of seconds like you say, a mild hissing noise, when just driving normally, every couple of minutes. It does not appear to be linked to acceleration/letting go of throttle.

JTaylor

Ignore this mate. Silly nonsense designed to make me feel superior. It didn't...just a bit guilty.

kilo_4que

I personally think its ure induction kit unless pslewis has a suggestion you can consider also. But with that i would expect a little hesitation in the drive

Barney19

With 800 miles on the clock?

kilo_4que

LOL its probably ure turbo. when ure turbo kicks in u can hear it hisss

SexyCrayola

brand new car, lot of money, .... did you not test drive the car to see if you liked it first??!!! - You kind of notice noises like that immediately especially when not had a turbo'd lump under there before.

If it didnt make a load of fatastically strange whooshing sounds etc I would be worried lol. Its part of the cars charm.

Scooby Dan

Try standing at the front of the car while it is idling and listen for it,I think it is the aircon.Turn the aircon off and have another listen ,I bet it stops. If so this is normal so dont worry.

patkin

It IS definitely your Airconditioning valve opening and closing .... a new WRX with the dump valve and other stuff wooshing highly unlikely

gso

when i have the aircon on, it makes the same noise....sounds like air escaping around somewhere...scary i know...turn off your air con and it should go away...

Like patkin said...i doubt a new car has a dump valve or induction kit

HOWY

Funny I get a whoosing noise from somewhere behind the dash board when air con is on so reckon it must be to do with that

ape250

Thought it was from the turbo/dump valve, until i drove a gx non-turbo which does the same thing, so i asked a technition and yes it is the air-con system venting etc etc.

Hello barney, glad to see that you are enjoying your new purchase, dont forget about your 1k service mind. Daniel

patkin

It is the liquid refrigerant valve opening and it then goes into the heat exchanger which cools the air and changes the state of the refrigerant into gas as it returns to the compressor. A temp sensor after the evaporator senses the temp and if too warm the liquid valve opens more, this is the wooshing you hear.

Houghton

iTrader: (1)

Blimey you lot must have quiet cars if you can hear the air con

Barney19

Cheers Daniel, it will be in during the next week or so.

Barney19

Thanks for all the replies everyone.

Barney.

jbwrx300

All turbo'd cars have dump valves - how else does the pressure get out?

I posted a little while ago about a strange noise - which went on and off every 30 seconds or so for about 5 seconds, most on here decided it was the air con and i'm happy with that explanation.

I also posted about being able to hear the whoooosh on a PPPd wrx, possibly due to the increased pressures generated. I can clearly hear the blow off valve on my MY05 when i lift off although it is not as loud as the aftermarket atmospheric dump valves.

Gutmann pug

Could well be the particals and molecules combining to cause thus downdraft?

Gary

SJ_Skyline

The whooshing sound, that's fuel surge, that is

What if ?

Perfect timing there Pete. I was just thinking, "what for it pslewis is bound to say the MAF" and there it was. LOL !!!!

My thoughts anyway- it's the Aircon, mine does it too. Switch it off, go for a drive, sweat your Boll*cks off with the windows shut and see if it still does it.

patkin

For the record what I said was "
.... a new WRX with the dump valve and other stuff wooshing highly unlikely"

GC8

Why keep suggesting that its a silly 'induction kit' when the thread starter said clearly that is a new '05 STI? The whoosh noise will be the re-circ dumpvalve.

Simon