Interesting noise when cold, should I be worried?

[Backpacker]

I'm getting a weird noise for about the first minute or two when the engine is cold, it sounds like it's coming from the passenger side of the timing cover. It sounds like something maybe plastic rattling around. but I'm almost certain it's from the timing belt area. I tried to use my stethoscope today but the noise went away by the time I pulled it out to listen. I took a video of the noise,

https://youtu.be/aq2biAIDKVY

The noise isn't 100% consistent, the quick taps vary in loudness

Any idea what it might be?

 

 

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[Backpacker]

Figured I'd update this,

After watching YouTube videos and using a stethoscope I'm pretty certain its belt slap and my tensioner is going out. I bought a timing belt kit, cam/crank seals, thermostat and the bypass hose. I'm not going to drive it till they come in sometime next week.

 

I'll update once I dig in to it.

 

 

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