Help me diagnose a knock

[mountainthings]

Can someone with a more experienced ear tell me what this knock might be? I don't think its the PCV, but can't quite locate it. I did a compression test and am getting over 200 in all cylinders. 300K KM / 192K miles. Should I be concerned?

 

[gamefreakgc]

Definitely coming from your driver's side bank. Normally I'd just blame noisy injectors but that is a knock of sorts. Have you tried changing the oil, or switching to a heavier weight? Sometimes that's all that is needed to quiet things down. Doesn't sound ominous yet. Compression check rules out valves, so that's good.

 

[plcfcng]

valve lash or injector noise use a solid bar or a stethoscope. Move it around until you find the loudest spot.
:typing:

 

[Dom8706]

Can someone with a more experienced ear tell me what this knock might be? I don't think its the PCV, but can't quite locate it. I did a compression test and am getting over 200 in all cylinders. 300K KM / 192K miles. Should I be concerned?

Any update to this? I have the same knock I believe but was told it's normal for 4runners to have this knock.

 

[jgue467]

That is Not a knock.

A knock is more like a hammer stiking a solid piece of metal and so loud it can be heard down the block.

Those sounds are normal, especially for a 20 yr or so old engine.

Just keep the oil fresh, some additives from Moly may help quite it down some.

Amazon.com: Liqui Moly (20002) Cera Tec Friction Modifier - 300 ml: Automotive