2018 370z nismo engine ticking

[Dave G]

It's part of the EVAP system. That system captures the fuel that has evaporated from the tank (typically in a carbon cannister) and essentially puts this vapour back into the engine in a controlled way. Judging by the ticking noise of the valve, it pulses the return of this vapour/suction of the inlet manifold on time with the engine. This could also explain why you don't hear the valve noise from cold. I assume that during warm up, emissions need to be tightly controlled so the EVAP valve remains shut. Once the engine is warm, the vapour can be purged. Well, that's what I think!