AudiWorld Forums

A8 / S8 (D4 Platform) Discussion Discussion Forum for the D4 Audi A8 Produced from 2010-2017 Audi S8 produced from 2012-2017
Sponsored by:
Sponsored by:

Loud whistle from intake after warm up

Thread Tools
 
Search this Thread
 
Old 01-22-2018, 08:01 PM
  #1  
AudiWorld Member
Thread Starter
 
HankJ's Avatar
 
Join Date: Mar 2015
Location: Alabama
Posts: 87
Received 9 Likes on 6 Posts
Default Loud whistle from intake after warm up
Very recently, my 2015 A8 4.0T began an annoying whistle and the check engine light came on. After getting the light checked, it came with leak in intake, low idle RPM.

What could this be, best way to fix and how serious could it be?

Thanks,

Hank
HankJ is offline  
Reply Like
Old 01-23-2018, 03:34 AM
  #2  
AudiWorld Member
 
BTAudi's Avatar
 
Join Date: Sep 2017
Location: USA
Posts: 180
Likes: 0
Received 21 Likes on 19 Posts
Default
Originally Posted by HankJ
Very recently, my 2015 A8 4.0T began an annoying whistle and the check engine light came on. After getting the light checked, it came with leak in intake, low idle RPM.

What could this be, best way to fix and how serious could it be?

Thanks,

Hank
The PVC valve may need replaced.
BTAudi is offline  
Reply Like
Old 01-23-2018, 12:25 PM
  #3  
AudiWorld Member
 
mtnboydl's Avatar
 
Join Date: Mar 2017
Posts: 194
Likes: 0
Received 13 Likes on 9 Posts
Default
Originally Posted by HankJ
Very recently, my 2015 A8 4.0T began an annoying whistle and the check engine light came on. After getting the light checked, it came with leak in intake, low idle RPM.

What could this be, best way to fix and how serious could it be?

Thanks,

Hank

Sounds exactly like what happened to me a few weeks ago on my 4.2. I wrote up a little DIY for it, but yours may have some slight changes.

To test if PCV valve, when it starts whistling, open the oil filler cap and the whistle will go away. That is a pretty solid quick test.
mtnboydl is offline  
Reply Like
Old 01-23-2018, 06:02 PM
  #4  
AudiWorld Member
Thread Starter
 
HankJ's Avatar
 
Join Date: Mar 2015
Location: Alabama
Posts: 87
Received 9 Likes on 6 Posts
Default
Originally Posted by mtnboydl
Sounds exactly like what happened to me a few weeks ago on my 4.2. I wrote up a little DIY for it, but yours may have some slight changes.

To test if PCV valve, when it starts whistling, open the oil filler cap and the whistle will go away. That is a pretty solid quick test.

That was it! I can I change the PVC valve?
HankJ is offline  
Reply Like
Old 01-23-2018, 06:21 PM
  #5  
AudiWorld Member
Thread Starter
 
HankJ's Avatar
 
Join Date: Mar 2015
Location: Alabama
Posts: 87
Received 9 Likes on 6 Posts
Default
Can you please send me the link to your DIY?
HankJ is offline  
Reply Like
Old 01-23-2018, 07:10 PM
  #6  
AudiWorld Member
 
Twglasgow's Avatar
 
Join Date: Apr 2017
Posts: 274
Received 5 Likes on 5 Posts
Default
Originally Posted by HankJ
Can you please send me the link to your DIY?
Easy search under PCV: https://www.audiworld.com/forums/a8-...ement-2940878/ Or the poster’s name
Twglasgow is offline  
Reply Like
Old 01-24-2018, 06:16 AM
  #7  
AudiWorld Member
 
landjb4u's Avatar
 
Join Date: Apr 2009
Location: Metro DC
Posts: 359
Received 30 Likes on 22 Posts
Default
Originally Posted by Twglasgow
Easy search under PCV: https://www.audiworld.com/forums/a8-...ement-2940878/ Or the poster’s name
That's for the 4.2 engine and not the 4.0T. Haven't seen one for the 4.0T yet...
landjb4u is online now  
Reply Like

Trending Topics

Old 01-24-2018, 07:04 AM
  #8  
AudiWorld Member
 
Twglasgow's Avatar
 
Join Date: Apr 2017
Posts: 274
Received 5 Likes on 5 Posts
Default
https://www.audiworld.com/forums/a8-...2920973/page2/ I don’t know if this helps or you already saw this thread. There may be more info in the 4.0t engine thread.
Twglasgow is offline  
Reply Like
Old 01-24-2018, 07:51 AM
  #9  
AudiWorld Senior Member
 
LexusLSguy's Avatar
 
Join Date: Feb 2017
Location: NJ
Posts: 648
Likes: 0
Received 6 Likes on 6 Posts
Default
Looks like a rough repair - 10 hours of labor. Other comments mention oil separator valve vs PCV. Maybe the same thing.

Shrieking sound coming from engine bay
Last edited by LexusLSguy; 01-24-2018 at 07:58 AM.
LexusLSguy is offline  
Reply Like
Old 01-24-2018, 07:34 PM
  #10  
AudiWorld Member
Thread Starter
 
HankJ's Avatar
 
Join Date: Mar 2015
Location: Alabama
Posts: 87
Received 9 Likes on 6 Posts
Default
I believe that they are the same.
HankJ is offline  
Reply Like



Advanced Search
Quick Reply: Loud whistle from intake after warm up


Reply Closed Thread Share

All times are GMT -8. The time now is 07:17 AM.