Any idea what this cap is?

[ronnyek42]

Today I was taking video of my engine ticking and tapping away and went under the hood and noticed this little green cap sitting on top of my intake manifold.

My car was at dealer once for an oil change and then I have handled oil changes since then. Never noticed it there before... No idea where it came from.

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[BigBeed]

They are usually on the ends of pressure and temp sensors to protect the threads or sensor. has probably been there since it was assembled and finally just vibrated or moved into view.

 

[Zrussian13]

Listening to the tick can drive a man insane...

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