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2005 STS N*
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125 Posts
Discussion Starter #1
The other day I fired up the car and I noticed a prominent squealing coming from around the front left. It is heard at idle, when driving a constant speed, and especially when accelerating. After the car has warmed up to its normal temperature it typically goes away. While examining, I believe that it is the idler pulley.

Can anyone support this or offer a new suggestion?
 

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'11 CTS-V Coupe M6, '05 1SG STS4 V8
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377 Posts
Use a mechanic's stethoscope to see if you're right, that would be the first thing I'd check too.
 

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Registered
2005 STS N*
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125 Posts
Discussion Starter #3
Okay this has been driving me nuts. I need advice big time! The sound is more of a whining not a squealing. Very noticeable when cold or when accelerating (with RPM).

I replaced 2 tensioner assemblies and the idler pulley per my mechanics suggestion. However, this did not fix my whining problem. I then took off both belts in which the noise was still there when I started up the car.
What spins that is not driven by the belts??? Is it just rogue VVT noise?
 

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Registered
2005 STS N*
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125 Posts
Discussion Starter #7
2005 STS with the V8 N*
Thanks, but it shouldn't be a vacuum leak as I have checked for those plenty of times and those will typically throw a code (I don't have the cel). The noise really sounds like something rotating that is around the top front of the engine
 
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