Bad bearing? Bad pulley? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 9 (permalink) Old 05-11-2014, 09:44 AM Thread Starter
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Bad bearing? Bad pulley?

I've noticed for a while now when ever I accelerate I can hear a whirring bearing type of noise but it goes away as soon as I let off of the gas. I'm thinking maybe a pulley but I've never dealt with them so I'm unfamiliar. Any else have this issue? If it's a pulley is there a most probable pulley it's coming from? 2005 Chevy cobalt 2.2 base 90120mi


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---------- Post added at 11:44 AM ---------- Previous post was at 11:40 AM ----------

The belt is new too


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post #2 of 9 (permalink) Old 05-11-2014, 03:39 PM
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Serpentine idler tensioner pulley bearing. At idle look at the pulley it should turn true, if it wiggles you need a new pulley bearing. You can't replace just the bearing on a Cobalt you have to replace the pulley assembly. About $35 give or take. Easy enough to change if you have a friend with a third helping hand.

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post #3 of 9 (permalink) Old 05-11-2014, 05:46 PM Thread Starter
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What's the process to remove it


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post #4 of 9 (permalink) Old 05-11-2014, 06:00 PM
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Just one bolt that you can access through the fender well.

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post #5 of 9 (permalink) Old 05-11-2014, 06:02 PM Thread Starter
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Ah crap that means I have to fight to put that stupid belt back on.


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post #6 of 9 (permalink) Old 05-11-2014, 09:48 PM Thread Starter
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Quote:
Originally Posted by Coby7 View Post
Just one bolt that you can access through the fender well.
Do you have a link for that special belt tensioner tool. The one I bought didn't have the square part at a 45 degree angle (PIA)

---------- Post added at 10:51 PM ---------- Previous post was at 10:48 PM ----------

I don't need a tension gauge right?

---------- Post added at 11:05 PM ---------- Previous post was at 10:51 PM ----------

and are you positive its the tensioner pulley bearing? Only makes the whirring squeak when I accelerate and when I let off the gas it's gone.

---------- Post added at 11:39 PM ---------- Previous post was at 11:05 PM ----------

I don't think I saw it wiggling at idle. Here is a video.
http://videobam.com/GtfbF

---------- Post added at 11:48 PM ---------- Previous post was at 11:39 PM ----------

I should also note that there is no whining sounds. Just a squeakish whirring when I step on the gas.
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post #7 of 9 (permalink) Old 05-12-2014, 10:10 AM Thread Starter
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I tried revving the engine while in park and couldn't replicate the sound


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---------- Post added at 12:10 PM ---------- Previous post was at 11:09 AM ----------

When I was driving to work I tried to take a better listen and it definitely only makes the sound when pushing the gas and it kind of sounds like a dog whistle


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post #8 of 9 (permalink) Old 05-12-2014, 11:43 PM Thread Starter
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I'm wondering if it's my CAI making the whistle.


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---------- Post added at 01:43 AM ---------- Previous post was at 01:34 AM ----------

Sounds like this. I think it's my CAI making a whistle. It's not the filter because that sound I'm familiar with.


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post #9 of 9 (permalink) Old 05-15-2014, 05:53 AM Thread Starter
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Bump


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