S4 (B6 & B7 Platforms) Discussion Discussion forum for the B6 Audi S4 produced from 2003-2005 And B7 Audi S4 produced from 2005 -2008

Engine startup rattle problem. Possible resolution....

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Old Aug 1, 2007 | 04:24 PM
  #11  
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Default My noise is def not a screech. It's more of a "clatter" than anything....

It's hard to describe. It sounds like a very dense piece of plastic with a decent mass is banging around inside the plastic intake manifold for about two seconds just after starting the car. It stops then occasionally the engine runs rough for about 5 seconds, finally settling down to normal operation. The engine roughness probably only happens 20% of the time after the noise. The roughness is likely because the intake runner flap is in the wrong position for long enough to screw up the engine computer a bit.
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Old Aug 1, 2007 | 04:25 PM
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you have the tensioner issue
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Old Aug 1, 2007 | 04:26 PM
  #13  
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Default Well, I don't know for sure....

What I do know for sure is that this sound is not a little sound. Although I am as **** about sounds in the car as the next guy, this sound is downright loud, and draws the attention of people nearby. It sounds briefly like something in the engine broke off and is banging around inside. It is a very nasty sound and not something that is pleasant to live with. Totally unacceptable.
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Old Aug 1, 2007 | 04:36 PM
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Tensioner Issue?
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Old Aug 1, 2007 | 05:20 PM
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Default Oh, let me explain!

<img src="http://siabani.com/s4/randompics/newb.gif">
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Old Aug 1, 2007 | 05:31 PM
  #16  
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The hydraulic chain tensioners make some noise on cold starts. There is an Audi TSB describing it.
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Old Aug 1, 2007 | 05:34 PM
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You're taking the fun out of this...Corrado, make sure to click on my post so you can get details.
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Old Aug 1, 2007 | 07:22 PM
  #18  
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Sorry, Sia... I was on a roll.
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Old Aug 1, 2007 | 08:27 PM
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How original. Sia = poop.
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Old Aug 1, 2007 | 11:54 PM
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That is too funny!
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