Boost Leak
#1
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Boost Leak
Hi,
03 STi has just been mapped...running fine but gradually getting this PPSSSSSS noise (air escaping) while coming on boost,been getting worse and worse... so...
I put on a new jubilee clip on the turbo intake,and checked everywhere for leaks...and only found on the intercooler one of the cast pipes is leaking oil...(see pic) it's leaking from the gasket and running down and onto the red turbo output hose. is this a big enough leak to be giving me this grief or am I looking for something more serious?
everything appears fine,I have sprayed carb cleaner on every joint/connection and what have you but I get no rpm increase or decrease.
when we were mapping the car I got a smell of oil but we passed it off as being one of the wagons...
here's the pic...thanks
03 STi has just been mapped...running fine but gradually getting this PPSSSSSS noise (air escaping) while coming on boost,been getting worse and worse... so...
I put on a new jubilee clip on the turbo intake,and checked everywhere for leaks...and only found on the intercooler one of the cast pipes is leaking oil...(see pic) it's leaking from the gasket and running down and onto the red turbo output hose. is this a big enough leak to be giving me this grief or am I looking for something more serious?
everything appears fine,I have sprayed carb cleaner on every joint/connection and what have you but I get no rpm increase or decrease.
when we were mapping the car I got a smell of oil but we passed it off as being one of the wagons...
here's the pic...thanks
Last edited by Motion-Mx; 25 January 2010 at 07:38 PM.
#3
Bumping the thread after an hour is taking the p*ss a bit, not like it was off the bottom of page 1, was it?
Are the bolts securing the inlet flange to the intercooler tight? Provided they are, and provided the gasket is still in one piece (have you taken the Y off to check?), there shouldn't be a significant air leak from there.
Your mapper has presumably seen a bunch of cars so what was his/her opinion of the cause? Was the leak sufficient enough to impact the turbo's ability to generate boost?
Are the bolts securing the inlet flange to the intercooler tight? Provided they are, and provided the gasket is still in one piece (have you taken the Y off to check?), there shouldn't be a significant air leak from there.
Your mapper has presumably seen a bunch of cars so what was his/her opinion of the cause? Was the leak sufficient enough to impact the turbo's ability to generate boost?
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well excuse the eagerness,but I'm so fed up...at the verge of selling this car.
I'v had the inter cooler pipe work off,all gaskets are in place,and i'v nipped up the bolts...
we had no real problems mapping it...apart from 5th and 6th a bit of compressor surge..but as I drove it the next day...it got worse and worse.
when I say it's leaking oil...there is a small puddle/damp spot where it's been running down and dripping off the red outlet hose...
I'v had the inter cooler pipe work off,all gaskets are in place,and i'v nipped up the bolts...
we had no real problems mapping it...apart from 5th and 6th a bit of compressor surge..but as I drove it the next day...it got worse and worse.
when I say it's leaking oil...there is a small puddle/damp spot where it's been running down and dripping off the red outlet hose...
Last edited by Motion-Mx; 25 January 2010 at 08:51 PM.
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well i'm not sure...
around 2800 rpms this hissing noise comes in and get's louder the more revs,and the car doesn't pull as well as it did after mapping.
what other causes could there be?
around 2800 rpms this hissing noise comes in and get's louder the more revs,and the car doesn't pull as well as it did after mapping.
what other causes could there be?
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#8
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I'v just had the airbox lid off and back on and looked around for anything obvious,and it seem's to have cleared up considerably..so maybe the airbox lid wasn't on to well...although it seemed to be.
now it's a slight whistle and a flutter when coming on boost...would the inter cooler gasket leaking be able to caus this?
now it's a slight whistle and a flutter when coming on boost...would the inter cooler gasket leaking be able to caus this?
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You can repair the leak, just clean up the joint and reseat with sealant. It can also be the DV leaking.
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Hey,
did replacing them help your problem? i'v been quoted 33 quid inc vat from montys in Sheffield,that's for the 2 inlet gaskets and the re circ valve gasket.
thanks,
did replacing them help your problem? i'v been quoted 33 quid inc vat from montys in Sheffield,that's for the 2 inlet gaskets and the re circ valve gasket.
thanks,
#13
However as far as gasket cement is concerned, you'll be wasting your time simply daubing it on the exterior of the assembled joint - especially when we already know there's oil leaking through it. This applies whether the sealant is 15 years or 15 days old.
If you have an intent to seal it properly you'll need to disassemble the joint, properly clean and degrease it, and then reassemble properly. If you use a liquid gasket, it must be on the mating surfaces, not applied to the exterior.
Although, provided the Subaru gasket is in good condition, there should be no need for liquids of any sort - and they're best avoided in areas like this anyway. If the proper part is degraded, the best fix is a new one as 2000 Sport says.
Provided all the bolts are done up properly, both on these connections and the DV flange, and provided the gaskets are in reasonably good nick, you won't find significant leakage from them.
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hey,
the gaskets are fully intact,no damage to them at all...I did apply the cement to the mating surface...not just blob it on the outside.
if it's not one of these joints...where else should I look? turbo inlet seems to be ok... airbox lid seems to be on right.
the gaskets are fully intact,no damage to them at all...I did apply the cement to the mating surface...not just blob it on the outside.
if it's not one of these joints...where else should I look? turbo inlet seems to be ok... airbox lid seems to be on right.
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gaskets are at my dealer's now,picking them up tomorrow...
is there anything else I can check while I have it in bits tomorrow? I'm going to have a real good look at the inter cooler hoses,anything else?
is there anything else I can check while I have it in bits tomorrow? I'm going to have a real good look at the inter cooler hoses,anything else?
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all new gaskets on the IC and hasn't helped one bit...
I'm beginning to think the car is just over boosting a little early maybe and it's just blowing off the boost.
a hope a map tweak will sort it.
I'm beginning to think the car is just over boosting a little early maybe and it's just blowing off the boost.
a hope a map tweak will sort it.
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