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bizzare sound just sfter start up!?

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  #11  
Old 07-15-2007 | 11:15 AM
2k S4's Avatar
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Default RE: bizzare sound just sfter start up!?

ORIGINAL: Apdl
looking at it this morning it souds like it is comming form the rear of the engine if it was the turbo would it make this noise at idle?
Not usually, since your turbo is on the passenger side. That might be the SAP. Purchase a Bentley manual, & look up how to test & replace it.
 
  #12  
Old 07-15-2007 | 05:13 PM
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Default RE: bizzare sound just sfter start up!?

so the SAP can go bad?

 
  #13  
Old 07-15-2007 | 05:33 PM
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Default RE: bizzare sound just sfter start up!?

Of course the secondary air pump can go bad, and its actuallya common replace item because they start to get noisey after a while.
 
  #14  
Old 07-15-2007 | 05:39 PM
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Default RE: bizzare sound just sfter start up!?

Omigod, engine parts break? No wai!
 
  #15  
Old 07-16-2007 | 08:53 PM
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Default RE: bizzare sound just sfter start up!?

oh snap yall are funny[sm=imsmilin.gif]

when i say go bad i ment like slowly start to break, as opposed to just fail
but thanks ill search for info on it!
 
  #16  
Old 07-17-2007 | 11:51 AM
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Default RE: bizzare sound just sfter start up!?

mine makes a sort of buzzing / grinding sound for a second or so upon startup and i've been told that this is the SAP but i really don't like the noise. Would replacing the pump make it silent again?
 
  #17  
Old 07-17-2007 | 12:06 PM
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Default RE: bizzare sound just sfter start up!?

The rear of the engine?

Did you inspect for cracked/split hoses? Is the car running normally, or has it lost power?

Sqeeking usually is belts, but the rear of the engine there are no belts. Just the cam chain. Lots of vacuum lines though.
 
  #18  
Old 07-18-2007 | 01:43 AM
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Default RE: bizzare sound just sfter start up!?

well i could be worng about the back i cant rev it b/c of the ele throttle so ill look more latter
it does sound like a belt issue to me but i am an old honda guy so this SAP and turbo thing are still new
as for performance loss i just got it a week and a half ago
 
  #19  
Old 07-20-2007 | 12:00 AM
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Default RE: bizzare sound just sfter start up!?

Up date looked at it with my GFs dad he is the head of the fleet of my home city but don’t know much about turbos
he said the noise is also coming form the back of the engine and thinks it could be an exhaust leak
he says when it gets hot enough it seals up if it is a really small leak
this explanation works for the sound coming form the back and the pitch changing with the RPMs
prolly needs a new gasket but ill prolly throw on a hi flow cat just incase
but ill keep yall updated
thanks!
 
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