Engine knock sound when revving during coldstart = avanza

[midnytwarrior]

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.

Sabagay dapat nabanggit ni TS na kumakadyot kadyot kung parang nasasakal o nalulunod ang makina.
If nag papalit ng spark plugs every 10k, i'm assuming na regular din ang oil change? Then if dati na nya ginagawa (yun pag rev at nagmamadali) at ngayon lang nangyare, assuming na same oil, hmm ano kaya....

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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.

Sabagay dapat nabanggit ni TS na kumakadyot kadyot kung parang nasasakal o nalulunod ang makina.
If nag papalit ng spark plugs every 10k, i'm assuming na regular din ang oil change? Then if dati na nya ginagawa (yun pag rev at nagmamadali) at ngayon lang nangyare, assuming na same oil, hmm ano kaya....