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Hi guys,

I'm having an issue with a noise that's causing me some concern. I have an '07 Caliber SE, manual transmission, 1.8L. The noise started when I replaced the alternator. I originally replaced the alternator due to the decoupler pulley, but the alternator itself also needed to be replaced. The noise is a high pitched whine, not like the turbo noise I have read about, and only occurs when the vehicle is in gear and I accelerate. First and second gear are faint, but the faster I go the louder it gets; there is no pitch change. When going 70+ it sounds like I'm going to murder my vehicle and there is a "humming" feeling in my pedals and steering wheel. If I push in the clutch a toe's length while still pushing in the gas pedal the noise stays. There is no reaction when I downshift or idle. This issue only happens when I push in the gas pedal and in gear. Has anyone had this problem or have an idea of what the issue may be? Thank you so much!
 

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If (like the OP) this noise didn't start until you replaced the alternator then the alternator is likely the culprit. Remanufactured alternators are notoriously problematic and you can go through a few brand new ones before finding one that actually works. Given how difficult it is to change them on a Caliber, buy a brand new name brand alternator (Denso makes one I believe...IIRC Mitsubishi was the OEM supplier) with the decoupling pulley already installed and call it a day.
 

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Does the noise only happen when the car is in motion, or can you still hear the noise if you rev up the engine while the car is standing still?
Only when it's moving the more I press the pedal the it's making noise
Does the noise only happen when the car is in motion, or can you still hear the noise if you rev up the engine while the car is standing still?
Only when moving, the more I cruise the more it makes noise
 

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First thought is that you have a failing wheel bearing...the often start growling when they go bad. Drive down an empty road and weave side-to-side...if you hear the noise change when you turn the steering wheel to one side but not the other, it's almost certainly a bad bearing.

If that doesn't help then drive down an empty road, then put the car into neutral and coast. This will allow the engine to drop down to idle speed while the car is still moving fast. If the noise changes, then it's something to do with the powertrain.
 
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