Hi guys,

I have a little problem with my 2015 ST-S Spyder since almost a year now... It's not easy to describe but I'll give a try.

Sometimes I can hear a little noise coming from the engine (I guess), or close to the engine, when it revs at 3000-3500 rpm. Not lower. Maybe higher but then the regular noise of the engine is too loud so I can't tell.
It NEVER happens when the engine is COLD. It will NOT ALWAYS happen when the engine is HOT. When it happens, I can stop the Spyder and still hear it when reving the engine at 3000~3500 rpm in neutral gear.

No other issue, the Spyder runs fine, no acceleration or idling issue.
I've been told it might be the EVAP purge valve, but as I said the Spyder always runs fine, I guess it wouldn't if there was a problem with the EVAP system, right?

The sound I'm speaking of is hard to describe, it's not very loud, it's not knocking/whining/rattling, it's a 0.5s noise every 1-2s (as long as I keep 3000~3500 rpm). I can't find any comparaison to describe it more precisely.

What should I check first? Thanks for your help.