Unknown Issue!!! Please help!!

[jsteez96]

So i recently bought a 2005 S4 and it is the most amazing car ever (let me brag for a second). The way it drives is amazing, the smoothness is unmatched, the interior is beautiful, and all around is a badass car! So i have all the records of a brand new clutch put in, brand new timing chain, brand new exhaust system, brand new suspension. The car started making this really low humming sound by the front right of the car (passenger side). When i warm up the car under 1k it doesnt make the noise but once it settles under it starts to make a humming sound in and out but no consistent pattern. I notice when i engage the car in gear it starts but once i get going it stops and drives fine. The check engine is not on, and the car drives/accelerates flawlessly. I contacted the seller (who is a gear head) and he said "he thinks its the fuel pump, that is a low pressure issue based on my description." He did say that he did not think it was a LIFE OR DEATH issue but i would love another opinion. I will be including a video with this post. The clicking is not what i am talking about but when the hum starts i grab my phone and adjust it. I also show how when i engage the car it starts. *PLEASE USE HEADPHONES

Any help would be greatly appreciated!!


P.s. i did try to search for the problem on the forum but im not the best navigating through a bunch of threads at work!!!

[Terry.Reese]

Thats a new one on me...

[jsteez96]

Right?? I was very confused too! It drives like its brand new which is amazing just has that little humming !

[jsteez96]

*also the clicking in the background is from my aux cord hitting the radio!

[VinnysS4]

Fuel pump? Not likely. The pump is under the passenger rear seat. If the sound is coming from the engine bay, I don't know how that could be the pump.
Does your secondary air injection system work as it should?
When it does this, open the air filter box. Does the sound get louder?

Sent from my SM-N920V using Audizine mobile app

[ven0m]

Cabin ventilation on or off?

[jsteez96]

The cabin ventilation was off! i took it to get it looked at and it is 100% ! the little vacuum sound is the aftermarket intake sucking in air. Thank god there is nothing wrong with the car! they let me know that the car was in miraculous shape for the year!