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noise after replacing serpentine belt

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Old 03-13-2014, 09:16 AM   #1
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Default noise after replacing serpentine belt

So,
I had my serpentine belt replaced last weekend on the 4.2 at 106,000 miles. i didnt take it to an audi stealership but did go to a Audi mechanic. After a couple days, i noticed a humming noise coming from under the hood. The car doesnt vibrate, doesnt have rough idle, doesnt make any grinding noises, and the humming noise goes away when in park or idle. Only time i hear humming is when i accelerate in speed. I do live in michigan and its been 10 degrees all week.

I am assuming the belt is on too tight? I have no clue other than that.
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Old 03-13-2014, 09:30 AM   #2
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it could be the idler pulley that the belt goes on as well. perhaps a bearing issue.
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Old 03-13-2014, 09:39 AM   #3
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Quote:
Originally Posted by raj99 View Post
it could be the idler pulley that the belt goes on as well. perhaps a bearing issue.
I would of heard the same noise before i replaced the serpentine belt if so, but this started happening after i replaced the belt.
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Old 03-13-2014, 09:43 AM   #4
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Quote:
Originally Posted by AFrancis View Post
I would of heard the same noise before i replaced the serpentine belt if so, but this started happening after i replaced the belt.
perhaps you would, or knowing my luck when I replace something, something else breaks 'coincidentally' at the same time

Regardless, try the belt first, but just wanted to throw another option out there.
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Old 03-13-2014, 09:58 AM   #5
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Quote:
Originally Posted by raj99 View Post
perhaps you would, or knowing my luck when I replace something, something else breaks 'coincidentally' at the same time

Regardless, try the belt first, but just wanted to throw another option out there.
exactly why i made this post, needed more views on this. Thanks always
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Old 03-13-2014, 12:01 PM   #6
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Can you look in with a flashlight and confirm that it is correctly seated on all of the pulleys?
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Old 03-17-2014, 04:46 AM   #7
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Quote:
Originally Posted by raj99 View Post
it could be the idler pulley that the belt goes on as well. perhaps a bearing issue.
I see you mentioned bearing issue here. You were correct! Turned out to be passenger side wheel bearing. Thanks to these Michigan Roads, Just from this winters pot holes alone, ive had 3 flats (Continental Extreme Contact DWS) , abs sensor, and now wheel bearing. anyways

Thanks to those that helped
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Old 03-17-2014, 05:54 AM   #8
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Glad you found the cause, bearings tend to go in harsh weather

Btw I'm getting a set of continental DWS, how did you like them?
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Old 03-17-2014, 06:45 AM   #9
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Quote:
Originally Posted by raj99 View Post
Glad you found the cause, bearings tend to go in harsh weather

Btw I'm getting a set of continental DWS, how did you like them?
I have the P245/40/ZR18 size which are low profiled. Rated over pirelli all season tires. Im not sure where you live, but in michigan weve had 8+ inches of snow at a time, and they are beasts. I never slipped once, as pick ups and jeeps were spinning out around me. The wear is good also, my rear ones have been on for 40,000 miles and still look new. But because of Michigan terrible roads, and pot holes the size of craters, these low pros pop easy and get bumbpy, but thats to be expected with all low profile tires ofcourse. Also they make barely any noise, cabin is still very quite.
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Old 03-17-2014, 09:19 AM   #10
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Quote:
Originally Posted by AFrancis View Post
I have the P245/40/ZR18 size which are low profiled. Rated over pirelli all season tires. Im not sure where you live, but in michigan weve had 8+ inches of snow at a time, and they are beasts. I never slipped once, as pick ups and jeeps were spinning out around me. The wear is good also, my rear ones have been on for 40,000 miles and still look new. But because of Michigan terrible roads, and pot holes the size of craters, these low pros pop easy and get bumbpy, but thats to be expected with all low profile tires ofcourse. Also they make barely any noise, cabin is still very quite.
Ok great to hear that you seem to like them. I'm getting a set of new car take-offs that have about 200 miles on them. The person wanted to run dedicated summer/winter setup. Which I've ran as well. But I couldn't say no to the deal I'm getting on the tires and figured that I could always use them as my 'winter' set if need be. Mind you, I live in Seattle and our winter consists of 5% sunshine, 50% light rain/drizzle, 40% heavy rain, 3% torrential downpours, 2% snow.
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Old 03-17-2014, 10:51 AM   #11
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Quote:
Originally Posted by raj99 View Post
Ok great to hear that you seem to like them. I'm getting a set of new car take-offs that have about 200 miles on them. The person wanted to run dedicated summer/winter setup. Which I've ran as well. But I couldn't say no to the deal I'm getting on the tires and figured that I could always use them as my 'winter' set if need be. Mind you, I live in Seattle and our winter consists of 5% sunshine, 50% light rain/drizzle, 40% heavy rain, 3% torrential downpours, 2% snow.
DWS= Dry, Wet, Snow. I believe they are best for snow and wet weather. But yeah theyre great tires, you cant go wrong with them. They look really good too.
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Old 04-03-2015, 11:10 AM   #12
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AFrancis, if you do not mind me asking, did the noise you heard almost sound like a low speed boat motor? I have a 2006 A6 4.2 and recently started hearing this noise in the last 5-7 days. It seems strange though because as the car is parked in my garage, I can somewhat hear a buzzing sound, but nothing really kicks in until I start accelerating. Once I hit 15-20mph I can hear it, and it gradually become louder as I go faster.

I just had a tire rotation and alignment, and am starting to wonder if that had anything to do with it. It almost sounds like a fan is grinding on something; but I do not have any other issues as you stated as well.

I just do not want to make anything worse by letting it go on; I go to my Uncle's mechanic in Toledo (I live in Akron, about 2.5 hours) because he gives me unreal price breaks, but was just there last Friday and did not want to have to run back up so soon.

Any thought?

And thank you in advance for any help.
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Old 04-07-2015, 09:01 AM   #13
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Sounds like a wheel bearing issue. Jack your car and hold the wheel at the 6 and 12 oclock position and see if there is any play. If there is, you know its your bearing.

Quote:
Originally Posted by rstrata57 View Post
AFrancis, if you do not mind me asking, did the noise you heard almost sound like a low speed boat motor? I have a 2006 A6 4.2 and recently started hearing this noise in the last 5-7 days. It seems strange though because as the car is parked in my garage, I can somewhat hear a buzzing sound, but nothing really kicks in until I start accelerating. Once I hit 15-20mph I can hear it, and it gradually become louder as I go faster.

I just had a tire rotation and alignment, and am starting to wonder if that had anything to do with it. It almost sounds like a fan is grinding on something; but I do not have any other issues as you stated as well.

I just do not want to make anything worse by letting it go on; I go to my Uncle's mechanic in Toledo (I live in Akron, about 2.5 hours) because he gives me unreal price breaks, but was just there last Friday and did not want to have to run back up so soon.

Any thought?

And thank you in advance for any help.
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