LIFTERS are making noise, especially when just.

SEE IF THIS HELPS---IT IS NOT AN INSTANT FIX---IT TAKES TIME TO WORK

https://www.2carpros.com/questions/2000-ford-ka-tapping-from-engine

LET ME KNOW HOW IT WORKS

YOU CAN ALSO WATCH THE YOU TUBE VIDEOS ON IT

THE MEDIC

You have a valve lifter/s leakdown problem-

Doesn't a Subaru have a rotary engine, though raz? Wouldn't that make a difference? I don't know rotaries all that well.

Dunno RMR, but Mazda does on their 80's RX's-unless they started manufacturing it-So much of a WankeL engine

Ok. I haven't worked on too many Subarus, but most of them I've worked on, I recall them having rotary engines. Nope. This is a horizontally-opposed 4 cylinder. From Mitchell1:
†There are a screw and nut at the valve end of each rocker arm. They are used for adjusting the valve clearance.

Now a days I won't be surprised with this high tech stuffs we got-half an engine on the front and the other on the back-lol

LOL.