Hi,
The noise is likely the result of a loose belt. I need you to try something. When you start the vehicle, does the noise change if you turn the AC on? Also, does it get louder or change if you place a heavy load on the alternator? For example, is it different if you have the headlamps on, wipers, blower motor, and other electrical components?
Here is my theory. I have a feeling the alternator belt is loose. I feel it is allowing the battery voltage to drop. That could be the cause of the drivability issue. So, I need you to check all belts to see if they are tight. I'm specifically interested in the alternator belt. See pic below.
Let me know.
Take care,
joe
See pic below.
Image (Click to make bigger)
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Thursday, August 24th, 2023 AT 9:15 PM