Hello guys,

I have a thing that is bothering me for a while. So I have an Audi A4 b8.5 3.0 TDI 180kw. After replacing the timing chain set and a lot of other things while the engine was out, I noticed that theres a sound that I think I never heard it before. The sound is kind a hard to describe - it is like puffing, hissing sound. If it was a truck, I would say that air is leaking somewhere 😂 Interesting thing is, that sound is only heard if you stand in front of the front wheels - left and right. If you stand in front of the hood you just hear normal engine idle sound. Car runs perfectly, no problems, no fault codes, no increased fuel consumption etc. Some guys said, that maybe the car wants to do regeneration. https://imgur.com/a/UDCOPJ1 (dont mind the tyres 😂) alongside normal idle you hear the sssssss coming. 

Trying to figure what is providing this hissing, puffing sound (sssssss) or I’m halucinating and this is normal working sound. Noticed it after full chain replacement and other stuff while the engine was out. Also couldnt tell if it was the same before the service.

Best regards,

Sorry Tomas. I can not hear any unusual sounds.

People often post audio and video recordings in an effort to identify unusual noises, but it is rare that we can hear anything strange, so you are not alone.

Hey Cliff, thanks for a reply,

For example here, is the engine sound in the morning https://imgur.com/a/TPzDtr4
You can definetely hear the sssss louder when the engine is warm (first video I posted)

 

10 hours ago, Fuxen said:

Hey Cliff, thanks for a reply,

For example here, is the engine sound in the morning https://imgur.com/a/TPzDtr4
You can definetely hear the sssss louder when the engine is warm (first video I posted)

 

Hi can hear a slight hissing which seems more like a belt idler pulley, the things I would be more worried by are the perishing on the tyre and the leaking shock absorber.

Steve.

Hey Steve, thank you for feedback.

is it possible that new pulley is making these noises? Or it needs more tightening?

yeah, tyres going to trash bin on sunday. Thanks about shock absorber also, will take a look

5 minutes ago, Fuxen said:

Hey Steve, thank you for feedback.

is it possible that new pulley is making these noises? Or it needs more tightening?

yeah, tyres going to trash bin on sunday. Thanks about shock absorber also, will take a look

Hi could be the pulley but I doubt it unless you bought a real cheap one, sounds more like a belt tensioner or one of the idler pulleys. With regard to the shocks replace both as the new shock normally finishes off the old one plus it will make it turn and ride better.

Steve.

Thank you for your and insights!