430 F430 - Purring/pulsing noise from right-rear, at idle?

Alright I know this is a long shot, as noises can be a million different things, but after 4 years of ownership this is a new one for me.

During the last couple of drives, about 50% of the time when sitting at a traffic light, my F430 makes this noise from the right-rear that I can only describe as a cat purring. It's very rhythmic, in a pulsing pattern about every 2 seconds or so. Not super loud, but loud enough for me to think... "hmmmm what's that." Wife hears it too so it's not just me being obsessive, LOL.

There are no other symptoms, everything works fine and no warning lights (thankfully). F1 system was serviced about 9 months ago -- gear potentiometers were replaced and has been running great ever since.

Some other observations:
1) Didn't do it when leaving home, seems to start after warmed up?
2) Only hear it when sitting at red lights. If it happens while driving, you can't hear it over the road/engine noise
3) Putting it in neutral at a traffic light didn't affect it whatsoever - noise continued the same
4) Didn't do it arriving home (fully warmed up). Wanted to take a video before shutting it off but it sounded perfect, no weird noise whatsoever when idling in front of the garage.

Anyway, it doesn't seem like an immediate threat of anything and is hopefully fine, but just wanted to throw it out there in case anyone has experienced the same thing. Cheers everyone.

 

Thanks guys. I can't say for sure it's not the F1 pump responsible for the pulsing/purring noise, but FWIW the pump sounds completely normal when opening the driver's door, turning the key, amount of time running, etc. Usually when the pump kicks on while driving, I can hear it and am very familiar with that sound.

I have an Autel AP200 and can check and see if there are any codes, but with everything working well, would there be any? Might just have to jump out of the car next time I hear it and try to pinpoint the location.

 

No problem, will see what I can find out on the next drive. I have doubts it's the F1 pump, as this is a completely different sound and much faster than that ever turns on and off. This is more like something vibrating every 2 seconds, in a wave pattern. Wondering if it could be the passenger side fuel pump, but don't wanna get ahead of myself, haha. Will report back when I know more. Thanks again guys!

 

Yep, will try my best. I wanted to do just that a couple days ago, but here's what happened... very frustrating:


(from top post)

 

Update - guess I'm not going to worry about this for a while. Went for a drive this past weekend, and happy to say I never heard the noise.

FWIW... -if- this is possibly related to a fuel pump, I left the house with 1/4 tank and filled up close to home. (previous fill-up was July of last year, so not fresh but not super old). Never heard the sound before or after. If it only happens when the car is warm, the pump would have been very submerged by that point. The previous 2 drives were with about 3/8 to 1/4 tank, and both being the first drive in many weeks. This last one was only 1 week since the previous drive. I'm aware of the fuel pump issues on these cars and always do the sniff test before driving, but realize they'll need replacing at some point.

Anyway, just gonna enjoy for now and hopefully all is good. Thank you for the support, I always appreciate the excellent community we have here.