MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: daisydave on April 17, 2013, 06:31:22 pm
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Hi all, don't post much on here as I'm more of a aircooled boy with a bay but have had my gti for about a year now and tbh I have grown quite attached :) Recently I have been hearing a faint hissing when the boost comes in and a blow off noise when I lift off the throttle almost like a dump valve :/ I also seem to be down on top end power like I'm down on boost.
I have done some research and been under her today and have found some oil collecting around the intercooler inlet so have cleaned the seal up and ordered a set of new seals to replace then all.
I also took a look at the DV valve as I was pretty sure this was the culprit and found the connector swimming in oil, if there is oil passing it surely so will air?? so I have ordered a new valve.
Just wondered if you lot thought this sounds about right or if there is other things I could be checking for?
Also the car is an 05 dsg and is totally standard.
Cheers
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If you have oil on it there's a very high chance the diaphragm has split and spitting out air & oil :sad1:
At least it's a cheap fix :happy2:
Intercooler pipes always end up leaking, your best off buying the small pipe connector
Graeme
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Coolio cheers but small pipe connector? Do you mean the seals on the actual boost pipe, if so that's what I have ordered :)
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Hi all, don't post much on here as I'm more of a aircooled boy with a bay but have had my gti for about a year now and tbh I have grown quite attached :) Recently I have been hearing a faint hissing when the boost comes in and a blow off noise when I lift off the throttle almost like a dump valve :/ I also seem to be down on top end power like I'm down on boost.
I have done some research and been under her today and have found some oil collecting around the intercooler inlet so have cleaned the seal up and ordered a set of new seals to replace then all.
I also took a look at the DV valve as I was pretty sure this was the culprit and found the connector swimming in oil, if there is oil passing it surely so will air?? so I have ordered a new valve.
Just wondered if you lot thought this sounds about right or if there is other things I could be checking for?
Also the car is an 05 dsg and is totally standard.
Cheers
Oil on the DV is possibly a sign of your breather system letting by. The early PCV valve systems were prone to failure and there has since been a few revisions.
Did you have any splits or tears in the DV rubber diaphragm?
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I never took it off as I was running out of time and as there so cheap I thought I would change it as a matter of course being that they do appear to be a bit of a week link.
I have checked the PCV system by undoing the oil filler cap whist running and the revs dropped as they should or is there other things I should be looking for?
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I never look it off as I was running out of time and as there so cheap I thought I would change it as a matter of course being that they do appear to be a bit of a week link.
I have checked the PCV system by undoing the oil filler cap whist running and the revs dropped as they should or is there other things I should be looking for?
I would physically remove the Front PCV and inspect the valves.
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Ah ok, what I'm I looking for just worn split seals and diaphragms?
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Ah ok, what I'm I looking for just worn split seals and diaphragms?
http://changegears.wordpress.com/2011/08/18/g-revision-pcv-valve-internals/
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Coolio cheers but small pipe connector? Do you mean the seals on the actual boost pipe, if so that's what I have ordered :)
IIRC it's the pipe from the discharge pipe to the intercooler that leaks, it's only a small section of pipe (20cm ish)
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Well replace my DV today aswell as some boost pipe seals, this is what the valve was like so please a looked Ito this! (https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fimg.tapatalk.com%2Fd%2F13%2F04%2F19%2F4a7anaqu.jpg&hash=a51b3947604565196ca8e32d63effacf3a5a5966)
I'm surprised at the difference, it's not just better than before I noticed the noise it's better than ever. A lot better throttle response and the car takes off now it's like having a new car :)