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I think I have a bad idler pulley. Started chirping this morning. After lunch I go outside to see what exactly is making the noise and of course it’s quiet as can be.
I turned off the engine and physically check the idler pulley and it does have some slop. Looks kinda rough too.
I think I’ll go ahead and get a new tensioner and belt too.

It has 2004 Mustang GT heads. Do I get a Thunderbird or Mustang idler pulley?
 

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97 Thunderbird 4.6, 98 Mark VIII LSC
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They're the same. I would order the SKU for the MN12 though, let the corporate overlords see what car I'm putting it on! :ROFLMAO:
 

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The first one to go is usually the tensioner pulley. I would replace the tensioner if you have not, and that idler pulley. Get Motorcraft for both, don't want to end up with a plastic idler pulley.

Al
 
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