BubbRubb S4-Less

Saturday was a bit warm (~90* and 80% humidity) and drove for about an hour out to some hiking trails. When I got there, let the car idle for about 3-4 minutes to let the turbos cool a bit while I put on boots and got pack situated. After I turned the car off, I heard the weird pulsing noise that had me a bit concerned. Here is how I can describe it:

Location: Loudest near passenger rear tire well
Loudness: Rather subtle, about 25% of the car lock notification, maybe less
Sound: Somewhat like the car lock notification, but a bit more drawn out. Where the car lock notification is short, this was about 3-4 times as long, and was more of a wave than the staccato "brrp" of the car lock notification. Was also a 2-3 second pause between pulses.

Can anyone help here? I did not get any codes or alerts. I'm a bit concerned. Thanks in advanceā€¦.

matt

Miles

I haven't looked for where it's coming from. It's nothing to be too worried aobut. I first noticed it last summer.

If anyone has had this problem and successfully tracked it down, I'd appreciate the info too.

FASTAXI

Me too...sounds like a very faint but constant hum. Like a low freq. tuning fork

O.W. Kenobi

If you get the "run time exceeded" code, that's a failing pump. STFA for "kenobi lock pump" for some pictures and a discussion. Not much to be done other than replacing the pump itself for $500.

S4 in Margaritaville

On hot days, the pressure increases inside the tank. A pressure relief valve that will bleed gas off into the atmosphere, to keep the pressure in the tank within a specified range.