Engine Sound at Idle - Tapping/Knocking

[kamabazi]

Yes this is another Audi engine sound thread. I have a new 2024 S5 that I bought with 18 miles on it and now at just under 1000 miles.
I am noticing more and more engine noise that does not sound right. I had the car at the dealer for vibration during drive and also mentioned to check for engine noise. He said everything is checked and no issue. I am not convinced they really checked anything. Contemplating my next step.
I am aware there is some noise by the purge valve which exists and Audi basically states is normal.
Here is a audio demonstrating the purge valve noise.


My new s5 has this noise but it also has another noise in the background which is in addition to above and is what concerns me the most. Listen for tapping/knocking sound in the background of higher frequency sound which seems to be purge valve. Not sure what lower frequency sound in the background is.

Again this was taking with engine not fully warmed up, about a minute after it was started.

Audi next to the Engine literally 6" away from it
https://drive.google.com/file/d/1dBa...usp=drive_link

Second audio is from next to the driver side wheel
https://drive.google.com/file/d/1xG9...usp=drive_link

[fusion3214]

hmm.. yeah the tapping doesnt sound right. i have the same lower pitched "howling noise" on my 2024 SQ5. havent brought it to the dealer to diagnose yet.

[kamabazi]

I uploaded another video of the knocking/tapping sound. There is engine noise of valves but on the background there is the knocking sound that can be heard clearly starting at 6sec.
Not clear what it is. Looking from the front it seems to loudest to the right of the engine oil cap and towards the front right side of the engine, looking from the front of the car.



Really perplexed.

[fusion3214]

id go back to the dealer and request that they look at the video, or request for a tech to stop by the service lane to show them personally. if they also let you know what that lower pitched noise is (howling or sounds like air escaping from under the door) definitely post their diagnosis.

[ZeeksterATX]

My 2024 S5 is making a lot of the same sounds. I also had them check it out when I brought it in for the other service items that I found at delivery and was told it was normal. I'll have to pay more attention the next time I start it up to see if I also have that slapping noise though.

That really is the only complaint I have with the car as a whole is it sounds like a diesel engine. I really expected it to be quite, like every other car I have owned in the past. Mine is 100% worse at start up as well and like that for a couple of mins. After it warms up it's much quieter but it still make a lot of those sounds.

[Eos]

My '23 s4 has that same noise since day 1. Haven't taken it back to audi yet, but will have them look at it at some point. Subbing to see what this ends up being.

Edit: Went through the videos, I have the issue in the first video where its the annoying loud tapping. Haven't heard the noise posted in the other vids.

[ZeeksterATX]

Yes this is another Audi engine sound thread. I have a new 2024 S5 that I bought with 18 miles on it and now at just under 1000 miles.
I am noticing more and more engine noise that does not sound right. I had the car at the dealer for vibration during drive and also mentioned to check for engine noise. He said everything is checked and no issue. I am not convinced they really checked anything. Contemplating my next step.
I am aware there is some noise by the purge valve which exists and Audi basically states is normal.
Here is a audio demonstrating the purge valve noise.


My new s5 has this noise but it also has another noise in the background which is in addition to above and is what concerns me the most. Listen for tapping/knocking sound in the background of higher frequency sound which seems to be purge valve. Not sure what lower frequency sound in the background is.

Again this was taking with engine not fully warmed up, about a minute after it was started.

Audi next to the Engine literally 6" away from it
https://drive.google.com/file/d/1dBa...usp=drive_link

Second audio is from next to the driver side wheel
https://drive.google.com/file/d/1xG9...usp=drive_link

Here is mine for reference.

While in cold start routine it's not to noisy. But once the idle settles and the engine is cold, it's pretty loud but I'm not hearing the same noise you did in your second video. Hope this helps. Sorry for breaking it up in 2 videos but I can't get the hood open while in the garage and I wanted to capture first start of the day.

https://youtube.com/shorts/WdpHPEVfm...XcdrIb6KD8XKrM
https://youtube.com/shorts/uSOfX41Pe...CDPUO5vC3FCnaP

[kamabazi]

Thanks for the inputs. Yes it seems we all have very noisy engines at start and sound changes as engine idles at lower rpm with the fuel or purge valve being quite loud.
One difference I see is in My S5 that there is tapping sound in the background and which is the loudest when I move the phone closest to the yellow sticker in the below video. Sounds like metal balls in the newton's cradle but at faster frequency.
https://www.youtube.com/watch?v=8OA4RBhosLE

Anyone has idea what it could be, I just dread taking it to dealer as they take their time with everything.

[Flint]

My 2023 S5 got quieter when I changed to 5w30 oil.


Sent from my iPhone using Audizine Forum

[kamabazi]

Interesting observation where the tapping sound from the engine originally cannot be easily heard from the driver seat after driving for 15mins and then coming to park.
But after parking I put the car in reverse or D it comes back and becomes louder as the car slowly rolls but goes away or drowns in engine noise once going faster.. Not sure what the relation ship is with this but could possibly and issue with crank shaft as it goes under the load it makes the noise? Anyone hears similar issue on B9 S5?

[fusion3214]

any response from the dealer? maybe they have another s4/s5/sq5 on the lot they can compare it with.

maybe its a vacuum pump? just taking a wild guess as that would be one of the moving components thats controlled by the camshaft near cylinder 4.

[kamabazi]

I have scheduled service appt but the earliest one is in 2 weeks. Another dealer 45mins away has it available this week so I may go for it.

I hooked up the OBD2 scanner and there are no current faults. I started tracking misfires and there are tons of those. Not sure if this is real or incorrect reading by the OBD2. Using a vgate 1.4 with Car Scanner Pro

[JohnEnglish]

I have scheduled service appt but the earliest one is in 2 weeks. Another dealer 45mins away has it available this week so I may go for it.

I hooked up the OBD2 scanner and there are no current faults. I started tracking misfires and there are tons of those. Not sure if this is real or incorrect reading by the OBD2. Using a vgate 1.4 with Car Scanner Pro

What the engine registers as misfires aren't necessarily misfires

[Advocado]

I have scheduled service appt but the earliest one is in 2 weeks. Another dealer 45mins away has it available this week so I may go for it.

I hooked up the OBD2 scanner and there are no current faults. I started tracking misfires and there are tons of those. Not sure if this is real or incorrect reading by the OBD2. Using a vgate 1.4 with Car Scanner Pro

Any updates on that?

[kamabazi]

Dealer listened to the video and said that does not sound good. Asked me to leave the car and they will check in the morning as it is much easier to hear it cold.
After 2 days they said it seems to sound normal to them. They said nothing they can do but if it gets worse come back and you have to worry about nothing as your concern is recorded. Seems there is no preventive maintenance or expertise in place at Audi dealerships, they just want to replace parts after they are damaged or broken or when there is code present,

[humphammer]

My 2023 S5 got quieter when I changed to 5w30 oil.


Sent from my iPhone using Audizine Forum

This^^^^^^ Audi recommends 0w20 motor oil. That stuff is thin as water and mine was also a bit tappy until I switched to 5w20. It is much quieter now.

[kamabazi]

only 0w-20 comes in 508/509 so what do you do about that? If the engine fails they will blame the oil. So I am stuck using 0w-20. Yes if out of warranty then you can do what ever makes sense. Yes 0w-20 is literally water viscosity flows so easily.

[humphammer]

only 0w-20 comes in 508/509 so what do you do about that? If the engine fails they will blame the oil. So I am stuck using 0w-20. Yes if out of warranty then you can do what ever makes sense. Yes 0w-20 is literally water viscosity flows so easily.

I have serviced my car myself from pretty much the day I bought it. I've never had an issue with it at all, so I've never had to take it to the dealer for any reason. I would think they would have a really hard time making it hold up in court that switching to a 5w20 weight oil was the cause for engine failure, but I don't have any experience to back that up. I change the oil and filter in my car every 5,000 miles. I use Pennzoil Ultra Platinum full synthetic 5W20. The dealer used 0W20 (I think it was Liquid-Moly) and the charge was over $200 for an oil change the one time I used them. The cost of the oil and filter is less than $80 when I do it myself and I actually take the drain plug out rather than use an extractor so I know mine is done correctly and that it has plenty of time to drain all the old oil out and it will not be overfilled. I don't know if your engine tapping is oil related or not, but the change to 5W20 definitely made mine quieter.

And for the record if I lived in Wisconsin, or any Northern state where it gets extremely cold I'd maybe stay with the 0W20, but in Tennessee we really don't have enough cold weather to warrant using that thin of an oil.

[zac3707]

I have serviced my car myself from pretty much the day I bought it. I've never had an issue with it at all, so I've never had to take it to the dealer for any reason. I would think they would have a really hard time making it hold up in court that switching to a 5w20 weight oil was the cause for engine failure, but I don't have any experience to back that up. I change the oil and filter in my car every 5,000 miles. I use Pennzoil Ultra Platinum full synthetic 5W20. The dealer used 0W20 (I think it was Liquid-Moly) and the charge was over $200 for an oil change the one time I used them. The cost of the oil and filter is less than $80 when I do it myself and I actually take the drain plug out rather than use an extractor so I know mine is done correctly and that it has plenty of time to drain all the old oil out and it will not be overfilled. I don't know if your engine tapping is oil related or not, but the change to 5W20 definitely made mine quieter.

And for the record if I lived in Wisconsin, or any Northern state where it gets extremely cold I'd maybe stay with the 0W20, but in Tennessee we really don't have enough cold weather to warrant using that thin of an oil.

Curious why you didnt go with 0W-30, or in your case, 5W-30. If your complaint is about 0W-20 being thin like water, you're not increasing running temp viscosity at all by running 5W-20.

[Advocado]

Curious why you didnt go with 0W-30, or in your case, 5W-30. If your complaint is about 0W-20 being thin like water, you're not increasing running temp viscosity at all by running 5W-20.

My main question is, why SQ5 runs 5w-30 while S4/S5 runs 0w-20?

[humphammer]

Curious why you didnt go with 0W-30, or in your case, 5W-30. If your complaint is about 0W-20 being thin like water, you're not increasing running temp viscosity at all by running 5W-20.

Oh, I didn't really have a complaint. The tapping sound was on start-up and went away when the engine was warm. I went with the Pennzoil Ultra Platinum 5w20 because that is what I had on hand and it's the same thing I use in my other vehicles, both I might add that call for 0w20. After the change I noticed that I no longer had the tapping sound on start-up so the only thing I can imagine is the change in oil had a positive effect.

BTW, I have driven Hemi's for years without ever having engine issues and they are notorious for having lifter chatter so the pecking upon start up on my S5 didn't alarm me.

[kamabazi]

Oh, I didn?t really have a complaint. The tapping sound was on start-up and went away when the engine was warm. I went with the Pennzoil Ultra Platinum 5w20 because that is what I had on hand and it?s the same thing I use in my other vehicles, both I might add that call for 0w20. After the change I noticed that I no longer had the tapping sound on start-up so the only thing I can imagine is the change in oil had a positive effect.

BTW, I have driven Hemi?s for years without ever having engine issues and they are notorious for having lifter chatter so the pecking upon start up on my S5 didn?t alarm me.

The sound I had is more prominent when cold but is still present in the background even when warmed up. Dealer initially sad this does not sound good and perhaps engine may have to replaced as we do not try figure out what is wrong on such a new engine. After keeping for couple of days he said no codes and they are not hearing the sound as it sounded in what I recorded. I agree 0w-20 is very thin. I just changed it around 1300 miles using Mobile 1 ESP 0w-20 which is the same oil dealer sells in Audi bottle. I am in Texas and for warm weather 0w-20 is definitely thin but since there is a potential engine may develop an issue(to me tapping noise is not normal), I just do not want to risk warranty coverage using another oil weight.

For those who complain of 0w-20 Toyota and Mazda are using 0W-08 oil
https://www.eneos.us/blog/0w-8-motor...ota-and-mazda/

[humphammer]

The sound I had is more prominent when cold but is still present in the background even when warmed up. Dealer initially sad this does not sound good and perhaps engine may have to replaced as we do not try figure out what is wrong on such a new engine. After keeping for couple of days he said no codes and they are not hearing the sound as it sounded in what I recorded. I agree 0w-20 is very thin. I just changed it around 1300 miles using Mobile 1 ESP 0w-20 which is the same oil dealer sells in Audi bottle. I am in Texas and for warm weather 0w-20 is definitely thin but since there is a potential engine may develop an issue(to me tapping noise is not normal), I just do not want to risk warranty coverage using another oil weight.

For those who complain of 0w-20 Toyota and Mazda are using 0W-08 oil
https://www.eneos.us/blog/0w-8-motor...ota-and-mazda/

I definitely would not be happy if it persisted past cold start-up. Changing oil may not help you at all but it has been shown to help in other engines and it did help my S5. I wonder if the change in manufacturers recommendations for oil viscosity doesn't have more to do with the mandates on fuel economy than it does with engine protection. The Hemi engine for example has been used by Chrysler for a long time with relatively few changes, but has gone from 5w30 to 5w20, to now 0w20 recommendation by Chrysler. So, what changed? I have a Ram truck with a Hemi and it's quiet as a mouse even with the factory fill of 0w20, but there are hundreds of video's of Hemi engines that had a lifter tick that went away when changing to a higher viscosity oil. It may not work for you, but if you don't get it resolved through Audi it might be worth a shot. Here is just one of many video's.

https://youtu.be/Jr3j-JrWFrg?si=nXvQc6Ju_23DAt2t

[kamabazi]

I definitely would not be happy if it persisted past cold start-up. Changing oil may not help you at all but it has been shown to help in other engines and it did help my S5. I wonder if the change in manufacturers recommendations for oil viscosity doesn't have more to do with the mandates on fuel economy than it does with engine protection. The Hemi engine for example has been used by Chrysler for a long time with relatively few changes, but has gone from 5w30 to 5w20, to now 0w20 recommendation by Chrysler. So, what changed? I have a Ram truck with a Hemi and it's quiet as a mouse even with the factory fill of 0w20, but there are hundreds of video's of Hemi engines that had a lifter tick that went away when changing to a higher viscosity oil. It may not work for you, but if you don't get it resolved through Audi it might be worth a shot. Here is just one of many video's.

https://youtu.be/Jr3j-JrWFrg?si=nXvQc6Ju_23DAt2t

I also have Durango with Hemi engine and yes it has the start up tick noise but it goes away after a couple of mins.
You are right it requires 0w-20 oil which should be banned to use in Texas hot weather.

I am stuck on the Audi issue and it is now a wait game to see if it gets any worse and Audi may be forced to replace the engine, at least that is what the dealer said but I am going to be quite upset having to get engine changed within first few thousand miles on a brand new car. So I am caught in the middle. I already went to 2 dealers and they do not see any code and say engine noise is normal to them.

[Advocado]

I also have Durango with Hemi engine and yes it has the start up tick noise but it goes away after a couple of mins.
You are right it requires 0w-20 oil which should be banned to use in Texas hot weather.

I am stuck on the Audi issue and it is now a wait game to see if it gets any worse and Audi may be forced to replace the engine, at least that is what the dealer said but I am going to be quite upset having to get engine changed within first few thousand miles on a brand new car. So I am caught in the middle. I already went to 2 dealers and they do not see any code and say engine noise is normal to them.

That’s unfortunately with every dealer for every manufacturer: no code - no work.

[fusion3214]

oddly enough my motor now has that off cycle click that matches what kamabazi posted previously. gonna bring it in and see what the dealer thinks.

[kamabazi]

Do post what you find as I am in wait and see game if the noise gets worse and dealer thinks something has to be done.
Engine seems to also have developed a whirling engine fan sound. Will have to take it it to dealer for it since it is very annoying when sitting idle at a stop light. Feels like a 10 year old beater.

[fusion3214]

Do post what you find as I am in wait and see game if the noise gets worse and dealer thinks something has to be done.
Engine seems to also have developed a whirling engine fan sound. Will have to take it it to dealer for it since it is very annoying when sitting idle at a stop light. Feels like a 10 year old beater.

earliest appointment i could get is in june. will keep you updated.

[kamabazi]

Did first oil change and got analysis done. Report is on a separate thread to get input if others have done similar early oil change and analysis.
See below. Does not look good having such high copper and iron content.

https://www.audizine.com/forum/showt...1#post15069011

[Advocado]

Did first oil change and got analysis done. Report is on a separate thread to get input if others have done similar early oil change and analysis.
See below. Does not look good having such high copper and iron content.

https://www.audizine.com/forum/showt...1#post15069011

That’s normal, as your engine break in. Thanks for doing a due diligence and changing the break in oil in 1k miles.

[kamabazi]

Plan to do second oil change ~ 6k miles and do another analysis to see how it looks after break in oil change

[fusion3214]

dealer tech + foreman reviewed my video and noticed the off cycle tick/tap noise near cylinder 4/5 right away but was unable to reproduce it. the fact that its not on a "cycle" such as injectors, camshaft or crankshaft rotation is interesting.

with my luck im willing to bet the noise is gonna pop up as soon as i drive it back home in a few days LOL.

[kamabazi]

dealer tech + foreman reviewed my video and noticed the off cycle tick/tap noise near cylinder 4/5 right away but was unable to reproduce it. the fact that its not on a "cycle" such as injectors, camshaft or crankshaft rotation is interesting.

with my luck im willing to bet the noise is gonna pop up as soon as i drive it back home in a few days LOL.

Yes this is sadly same here, dealer seems to not hear it. It is easy to hear it in a confined space like a garage but at the dealer in large space much more difficult to notice it. For now I am ignoring it as well but expecting visit in a few months if it gets worse or more noticeable. If you make any head way with it pls share the findings so I can share it with my dealer as well. Again dealer seems to not able to hear it but agrees not normal when I showed them the recorded video idling in my garage.

[fusion3214]

Yes this is sadly same here, dealer seems to not hear it. It is easy to hear it in a confined space like a garage but at the dealer in large space much more difficult to notice it. For now I am ignoring it as well but expecting visit in a few months if it gets worse or more noticeable. If you make any head way with it pls share the findings so I can share it with my dealer as well. Again dealer seems to not able to hear it but agrees not normal when I showed them the recorded video idling in my garage.

i drove it pretty aggressively for about 100 miles yesterday and the noise wasn't there this morning during cold start. at least its documented so they cant pin it on you down the road.