Engine Rattle Sound, Knock noise on Cold Start Up!

Tacoma 2002 | 4 Cylinder 2.7
Millage: 104

I can not find out where the sound is coming exactly and why the engine makes a Rattle noise or it seems to be a Knock Knock sound ( Hammer ) on the cold start ( Around 34F - 36F ).

Once the car is idle and increases the RPM it makes a louder sound. It's only happening once the weather is cold and disappears after a few minutes.

Here is the link to the video:

https://www.youtube.com/watch?v=SYumricZqSI

Let me know please what you think if if you had any previous experience with that sound.
Thanks

 

I honestly think that your truck is idling higher to compensate for the cold weather. I have a 2nd Gen 2.7L, but my truck does something similar (though it is less pronounced). Once the truck has been running for a bit, it quiets down significantly. I have a 2010 (purchased new in September 2009) that is quickly approaching 122K miles, and it runs as quiet as the day I brought it home!

 

@Taco critter

 

Could be slack in the timing chain and it’s smacking something, if it goes away after warmup it’s fine

 

I had a knock that got softer after warm up and found one strip came off serpentine belt and wound around water pump . New serpentine belt now no more knocks

 

Not some bearings going or clutch for air conditioner ?

 

it's called piston slap. i've got the 2.7 4cyl and it's the same deal on cold days. i've talked to guys with 6 cyl engines and they get it too. Toyota makes their engines a little bit loose on purpose, like AK-47's are made.

 

Throw them in the mud and come out shooting, same with Mossberg