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Weird sound under hood about 4-5 min after turning car off.

17K views 6 replies 7 participants last post by  Caps7yo1  
#1 ·
On my 2018 SE I4 if I turn my car off and sit in it for a little before I get out it will make a strange sound like something is humming, sounds kinda like when you first put the key in before you begin to turn on the car to start driving. I thought it may be a pump or something moving but I don't know much about engine components. The sound lasts for like 2-3 seconds and happens about 4 min after turning my car off. Hopefully its normal.. /:
 
#6 · (Edited)
"Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. This is the sound of a fuel evaporation leakage check and, it does not indicate a malfunction."

This is from the FR-s manual and other Toyotas are anywhere from 2-10 minutes.

Not sure why the FR-s is so far out, but it may be the mindset that they are driven harder.

The Camry manual talks about it, but I forget which page.