If it's a canned yell, don't open it.
Hard to tell without hearing it. With engine running, open the hood and try to determine the area where the noise is coming from then repost info.
Noise. Without noise, it can't work. Noise is in an engine, and without it does not work. Every engine has to make some kind of noise, internal or external, inside or outside the engine.
a
Your cat may open its mouth without making a sound because it is using a silent form of communication called "silent meowing." Cats often do this to communicate with humans or other animals without making noise. It could also be a sign of contentment or relaxation.
silence
imagine it. or, just melt the lid open
A bat
Because the can has to many bubbles!
Because the air is escaping.
either replace them or add motor honey to go for a longer perion without noise....
use toothpick
without doing any noise.