I hit a wall (figurative), anybody have any input? Checked out my TBB this afternoon...
12-30-2004, 04:35 PM
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I hit a wall (figurative), anybody have any input? Checked out my TBB this afternoon...
due to a wierd noise coming from the engine bay. Sounded like a "whoosh" sound from about 2500 to 3800 or so rpms. And everytime I let off the gas really quick after boost I hear this very faint "whoosh" like air rushing through something (kind of like when DV's go bad and you get that "blow-off" sound but much deeper).
Anyway, TBB looked good, no cracks at all, so I put it back in. Is there anything else I can check? Any hose that might be loose? If so, which hose and where would it be located? BTW its a stock 2001.5, just came back from 60k service this week, turbo's still sound normal and performance doesn't seem to be affected. TIA.
Mark
Anyway, TBB looked good, no cracks at all, so I put it back in. Is there anything else I can check? Any hose that might be loose? If so, which hose and where would it be located? BTW its a stock 2001.5, just came back from 60k service this week, turbo's still sound normal and performance doesn't seem to be affected. TIA.
Mark
12-30-2004, 04:50 PM
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Um...
<center><img src="http://www.stupidscifi.com/mambo/images/stories/captainobvious.jpg"></center><p>Not to point out the obvious, but did you test the DV's and check all the adjoining hoses? I use a mightyvac to test mine.
If you still have OE DV's a cheap swap to 710N's is in order after a few years of service
If you still have OE DV's a cheap swap to 710N's is in order after a few years of service
12-30-2004, 05:26 PM
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Yeah sorry I didn't mention, I have Hyperboost DV's in b/c stock ones blew a few months back...
Is it possible that there's another problem with these DV's? They're pretty solid, I don't see them being the cause of the problem. But you never know.
12-30-2004, 06:40 PM
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Yea, well... the answer, as stated before, is to pressure test if you're unsure...
You need a medium capacity compressor and to make a kit from home depot parts if you haven't already.
Don't rule the DV's out, they can leak.
Don't rule the DV's out, they can leak.
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12-30-2004, 07:58 PM
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I had a sound like that when a check valve literally snap in half
I didn't notice the performance loss until I was in another S4 that was working properly... Needless to say, the car felt a million times better when I replaced the valve.
It was located under the upper right engine cover near the PCV branch off the Y-pipe. It was totally obvious when I did a pressure test with the AWE intake pressure tester.
Other things to look for might be intercooler hoses that are loose or leaking like other people have said. Definitely spend the $15 or so on a pressure tester. It'll probably save you a lot of time, if not now then later.
It was located under the upper right engine cover near the PCV branch off the Y-pipe. It was totally obvious when I did a pressure test with the AWE intake pressure tester.
Other things to look for might be intercooler hoses that are loose or leaking like other people have said. Definitely spend the $15 or so on a pressure tester. It'll probably save you a lot of time, if not now then later.
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