[2013ACURAILX]

was the pcv changed with an aftermarket one?

the non honda replacements rattle like hell at certain rpm's had this issue on our 2015 EX and it drove me crazy until isolating it with a stethoscope.
pcv is in the back passenger side on the R18, rubber hose going to it.

 

[2013ACURAILX]

PCV
a quick test is pull the hose off the PCV valve.

 

[2013ACURAILX]

Passenger side back left corner of the engine...

careful not to lose the spring clamp from gravity when you pull it off the PCV.

 

[2013ACURAILX]

Got it so just replace the pvc valve

im not saying replace it im saying pull the hose and see if the rattle goes away...

some of the cheaper replacements have a weak spring in them and rattle.

 

[2013ACURAILX]

So just replace the water pump or is it two different parts?

get an automotive stethoscope, and carefully listening around for the noise.

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throwing parts at the problem will not solve it.

a quick test for isolating noises in the drive belt line, is to remove the belt, if the noise is gone with the belt off you know its one of the components in belt drive line.