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Need help with screeching sound on start-up

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Old 04-29-2015, 10:54 PM
  #16  
niner niner seven
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Originally Posted by LexVan
Original water pump? I don't think it's plugs/wires/or coil pack related, but you're up to date on this stuff too?
Yes still on original water pump.
Old 04-29-2015, 10:55 PM
  #17  
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Originally Posted by Carmichael
Could be a failed AOS diaphragm. They make a sound similar to this.
Air oil separator went about 3000 miles ago. Dealer repaired/replaced.
Old 06-16-2015, 06:59 PM
  #18  
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Updating this post:

I went ahead and changed the starter with a new bosch. Sound seems to have gone away.

This thread was huge help:

https://rennlist.com/forums/997-foru...placement.html

Thanks to all those who replied.
Old 09-07-2016, 12:29 AM
  #19  
Scott Clinton
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Default Starter Hanging Up - Sound

I had this same sound on my 996.2 and it was the starter hanging up. It would only happen once a month or so and never when i had it in for service. I finally decided to just have the started replaced at 77k and never had the sound again.



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