S4 B7 Engine Humming HELP

Old 07-26-2015, 12:13 AM
AudiWorld Newcomer
Thread Starter
Join Date: Jul 2015
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default S4 B7 Engine Humming HELP

I have a 2007 S4 B7.

The other day I turned the car on and heard an unusual hum coming from the back driving side of the engine. I would describe it as a mid range toned humming that sounds like a belt. It matches the rpms as i rev the engine for a second before the sound of the car drowns the humming out.

The sound has gone away twice randomly after the car has warmed up but doesn't always go away after its warmed up. Most of the time it stays the same no matter the temp of the car.

I have taken a small video of the sound with the hood open.

Please let me know what this might be and how much it could cost to fix.

Thank you!
shiftxgt is offline  
Old 09-03-2015, 06:43 PM
AudiWorld Member
sbcrazy's Avatar
Join Date: Jan 2015
Location: Orange County, Ca
Posts: 132
Likes: 0
Received 0 Likes on 0 Posts

Its the pcv valve. Under the plastic cover. There are a lot of post about them failing. Just sesrch.
sbcrazy is offline  
Related Topics
Thread Starter
Last Post
S4 (B8 Platform) Discussion
02-27-2012 10:02 PM
S4 (B6 & B7 Platforms) Discussion
03-24-2008 12:56 PM
S4 (B6 & B7 Platforms) Discussion
05-31-2005 04:37 PM
Audi 90 / 80 / Coupe quattro / Cabriolet
10-06-2003 03:59 AM
S4 / RS4 (B5 Platform) Discussion
12-07-2001 02:53 PM

Thread Tools
Search this Thread
Quick Reply: S4 B7 Engine Humming HELP

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: