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Hissing on cold start up?

Cullen

By Cullen
in General Vehicle Discussion

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Cullen

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This has been happening for a little while now and I have no idea what it could be. Seems to happen on cold starts, when the car hasn't been driven for a long time (after a full work shift, overnight etc). Car drives with slightly less power with a bit of hesitation as the car warms up then drives as you'd expect it to when it's at operating temp (this may be normal for these cars? idk). I wanted to upload a video but doesn't seem I can. The hissing happens for maybe a second or two then completely stops and everything sounds normal. This hissing is loud an can't be missed!

 

Any ideas or help would be great!

 

Car: Subaru WRX STI 2008

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Technikhaus Motormouth

Technikhaus

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Yup I'd say it's the secondary air pump. 
Does it do it for around 30 seconds, give or take?
can confirm if you record a video of the noise.  Pretty standard if that's the case :)

Can be removed/deleted, requires blanking plates, and a special cable to remove from the ECU, but worthwhile, they're also a common failure point and put the car into limp mode.

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