I recently got a very clean Vitz 2005 but I've noticed a really strange sound coming from the engine compartment can't tell from where exactly it sounds like a chirping noise(it sounds like night time insects creeeech, creeeech) the kind of noise you would think is coming from the belt.
I took it to the mechanic and had the belt tightened the noise got better slightly not gone though, to be exact it comes when you put the car on D and step on the throttle till you reach 20km/h and above then when you take the foot off and step the throttle slightly the noise comes in. Although if step on the throttle is hard the noise never comes.
I did not put HOC fuel so I am wondering if this is the common knocking sound?
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