Technicians seem to be pulling their hair out on this problem. Especially since there can be several causes. Apparently, some vehicles are prone to having a power steering pump that is not properly aligned with the other pulleys. Still others have found noisy water pumps. But the kicker here is that after replacing multiple components, it can all come down to a noisy cam synchronizer. If you want to avoid throwing parts at the problem, do this: Remove the serpentine belt from the engine and start the engine cold. Removing the belt before starting eliminates all the rotating accessory components from the mix. If you still have the chirping, aim your stethoscope (http://free-auto-repair-advice.blogspot.com/search/label/stethoscope) right at the cam synchronizer. Try re-adjusting the synchronizer before you decide to replace it.
If you don't hear the noise with the belt off and it returns when you re-install the belt, then you have a problem with one of your rotating accessory components.
P.S. don’t run the engine for more than a few minutes or you can overheat.
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How do you adjust the cam synchronizer?
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