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Humming at back of the car.

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Old 05-14-13, 08:12 AM   #16
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Originally Posted by LexBob2 View Post
As I recall, there is something in the owners manual about (humming) noises when the car is shut off and that it is normal. It's the fuel system purging itself periodically.

And as mentioned, the HID's make a humming sound too.
Yep, that's what it is. My GS does it and my mothers X3 does it as well, its normal there was a discussion in the 3GS forum thread on this. I'll see if I can find it.
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Old 05-14-13, 08:19 AM   #17
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Originally Posted by IS350atWOT View Post
Good to know. Maybe it starts only after its been parked over a certain amount of time?
True. Something like 8 hours, actually.
'13 ES 300h
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Old 05-14-13, 08:32 AM   #18
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I've had my ES350 for a month, but haven't noticed any noise when it's off. How long does the sound last after it starts?

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Old 01-15-15, 10:13 PM   #19
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Default True

Originally Posted by jim256 View Post
+1, It's a fuel evaporation leakage check, have had the sound on other cars but this one runs a little longer than the others.
Yes. This gentleman is correct. I bought my IS250 2 weeks ago. Heard the noise. Called the dealer. Evaporation leakage test. Normal. Hurts nothing on car. No drain on battery. Same power consumption as a wristwatch they say. Enjoying the car. But I wish I had the bucks for the FSport.
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Old 01-16-15, 07:19 AM   #20
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Heard the same noise from my wife's RX350. I was really baffled until I came in to read this forum. It is the fuel system. You would think every salesperson would tell buyers of this noise. It is in the manual but who reads that cover to cover. Thought I read it only does it when the tank is a 1/4 low or only has a 1/4 of a tank left.
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Old 01-16-15, 07:19 AM

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