Engine knock sound when revving during coldstart = avanza

[oj88]

Yep, my bad. Thanks sa pag correct po sir.
What I meant is yun pag enrich ng fuel kompara sa air kaya during cold start at ginamit agad eh parang na tope.

I believe it's the other way around. Engine knock due to pre-detonation is more likely to occur if the AFR is too lean.

TS:

Is it really a hard knock or more like a tick?

My take on this is that the oil, which hasn't reached operating temp yet, is still inefficient at doing its job immediately after a cold start. The noise should eventually dissipate as the engine warms up. If not, then you have a problem.