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compression issue
Posted: Thu Jul 10, 2014 11:21 am
by Jay_Lude
Not sure what to think of this problem or even if it's a compression problem, but when I start the engine it runs perfectly fine
Yet as soon as I switch it off, it makes a hissing noise for about 3 seconds like it's letting pressure out somewhere
Anybody got any ideas?
Posted: Thu Jul 10, 2014 12:13 pm
by Vtecmec
Could be the EVAP cannister or anything similar really, try to pinpoint the source of the sound with your head under the bonnet. Also check for snakes.
Posted: Thu Jul 10, 2014 12:15 pm
by wurlycorner
All of my 4th gens do that. I had no idea what it was but hadn't bothered investigating - charcoal canister is a great suggestion Mec!
Posted: Thu Jul 10, 2014 12:26 pm
by Jay_Lude
It's seems to be coming from around the air con valve area, and I know it's dangerous to have an air con fluid leak
Posted: Thu Jul 10, 2014 12:50 pm
by Merlin
It is the EVAP system. My 4th did this but after I ripped out the EVAP system it no longer makes that noise.
Posted: Thu Jul 10, 2014 1:12 pm
by Thebusofwoe
Yea, both my 4th gen and my Aerodeck do that. Its normal
Posted: Thu Jul 10, 2014 2:32 pm
by Jay_Lude
I never really noticed it Till the other day haha, no worries then if it's supposed to make that noise
Posted: Thu Jul 10, 2014 3:36 pm
by Vtecmec
I don't think it's supposed to, mine does not anyway.
Posted: Sun Jul 13, 2014 9:52 pm
by mercutio
it isn't supposed to do it but many do its possibly a leak from your intake
Posted: Sun Jul 13, 2014 10:43 pm
by Thebusofwoe
I think its a mix of the evap system, and the vac tank for the iab's letting off the vac. Its even louder when you have a open filter. Also vac from the motor idling will be releasing at the same time.