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Slight hissing sound under WOT...?

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Old 07-19-2012, 04:52 AM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
Slight hissing sound under WOT...?

OK so I got this issue, now I dont know if its something new or mbe had not noticed before. Sounds like a boost leak and I've trippled checked the bolts / gaskets etc.

Seemed to arise when I removed the S/C phenolics... mbe its a misaligned / damaged gasket. I reused the old ones ? Anything else come to mind?

Mbe its just how it sounds now ...
Old 07-20-2012, 04:30 AM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
Anyone ?

Hear similar? Is it normal ... ?

Change gaskets out ?
Old 07-20-2012, 09:54 AM
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It sounds like a boost leak and since you mentioned changing gaskets - start there....pressurize the system if you want to be 100% sure...

Also, you posted a change in your exhaust (in another thread).....Are you certain you don't have an exhaust leak (pinhole leak from a bad weld) ?
Old 07-20-2012, 10:48 AM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
The exhaust I think is ok as its more a hiss than a tick, and it was there before I did the mid section rework, and still there now.

Might be one of those semi transparent breather tubes that either dislodged or bust

And then it could be the gaskets. They have had a few re-re's in their life.
Old 07-20-2012, 10:54 AM
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Get the MAP from the OBD2 port to confirm if you have boost loss
Old 07-20-2012, 10:55 AM
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Originally Posted by cij911

Also, you posted a change in your exhaust (in another thread).....Are you certain you don't have an exhaust leak (pinhole leak from a bad weld) ?
Good point, you might want to check the flexi's you had installed
Old 07-20-2012, 12:13 PM
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The easiest way is spray some carb cleaner into the suspect leaking areas while the engine still running. If the rpm drops then you have a leak, if not you're fine. Good luck.

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Old 07-20-2012, 01:06 PM
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Originally Posted by Forrest Gump 9
The easiest way is spray some carb cleaner into the suspect leaking areas while the engine still running. If the rpm drops then you have a leak, if not you're fine. Good luck.
Not exactly...sometimes the leaks are only seen under boost (vs. vacuum)....Which is why I suggested pressurizing the system....
Old 07-20-2012, 04:32 PM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
thx guys...
Old 07-20-2012, 09:44 PM
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I'm willing to put money on it being an exhaust leak. Take it back to that exhaust shop, put it on the ramp, start the engine and feel around the flanges where they worked on/spray liquid. I'll bet that's the problem.

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