Repair your engine right away. Just click on the link I attached https://www.reliable-store.com/products/2010-holden-commodore-ve-ss-l76-engine-workshop-service-repair-manual
Sounds like the Idler pully(there is 2). it is probably seized. although its hard 2 see it not moving when the motor is going around. Its cheap & easy 2 replace. but b quick b4 it strips your fan belt 2 bits.!!
SOURCE: loud noise near the alternator
No I have a noise coming from left side while idling I popped hood and tried to trace where its coming from.....there's the cable from the alternator to the battery when I touch it I could now feel the knocks coming from that cable so its probably a problem with the alternator I haven't experienced a dead battery yet so it still works but don't know for how long
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also WD40 may unsieze the bearing in idler pully.(worth a try) (
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