Buzzing sound from engine when ignition half on - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

johan · 09-29-2015, 03:05 PM

Quote:

Originally Posted by ChrisD

Ahh ok, that makes sense. When we first heard it that was our first thought too - that it was the throttle body. But then we thought there's no reason for that to be trying to move when the engine isn't even running... I could understand it moving briefly as like a quick test or prep for the engine starting, but this noise doesn't stop even after 5 minutes of the ignition being half on.

The throttle still seems to work as normal when the engine is running, so I guess I should just assume its ok... but it really doesn't sound healthy when its not running and there's this constant buzzing lol

Quote:

Originally Posted by Ultramaroon

We have some pretty awesome subject matter experts in our 86 gang here in Portland. @johan was generous enough to perform an experiment for us last month. Here you can see a Honda K20 throttle body being controlled by the FA20 ECU.

Yup, as soon as you turn the ignition to "on", the throttle body motor is activated to position the tb at the correct position for starting the car. It is super loud. Another dead giveaway is that you can push the throttle pedal with the car in "on" and you'll hear the sound change as the motor moves the throttle around. I noticed that the Honda K20 TB is a lot quieter than the Subaru TB, same manufacturer, similar sound, just quieter. Also, you'll notice that when you turn the car off, it'll make a bunch of sounds from the throttle body as a part of the ECU shutdown sequence is to run the TB all the way open then closed. I'm guessing it's some sort of emissions thing to flush air through the motor.

paulca · 09-30-2015, 11:07 AM

Does the steering lock motor not unlock the steering when ignition is "ON". That motor can be quite loud.

Corsus · 10-06-2015, 02:02 AM

Oh nice, I've been watching your playlist with your GT86. Nice wrap btw.

Nevermore · 10-09-2015, 01:34 PM

Huh, I had always meant to ask about the buzzing. Glad I spotted this thread. I always thought it was the AC or the radio, but I'd keep them both completely off and still heard the buzzing. I think it's most noticeable when you go to turn the car off, that's when I always hear it.

paulca · 10-09-2015, 02:20 PM

Are you sure this isn't the steering lock motor you are hearing?

09-30-2015, 11:07 AM	#16
paulca Senior Member Join Date: May 2014 Drives: Toyota GT86 Coupe Red (UK) Location: United Kingdom Posts: 554 Thanks: 20 Thanked 291 Times in 171 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Does the steering lock motor not unlock the steering when ignition is "ON". That motor can be quite loud. __________________ Trunk = Boot \| Hood = Bonnet \| Sidewalk = Pavement \| Transmission = Gearbox \| Stick/shifter = Gear knob/stick \| E-brake = handbrake \| Windshield = Windscreen \| Turn signal = Indicator

10-09-2015, 01:34 PM	#18
Nevermore Wayward Member Join Date: May 2012 Drives: Hot Lava 86 Location: Bust of Pallas Posts: 3,336 Thanks: 1,669 Thanked 2,312 Times in 1,386 Posts Mentioned: 50 Post(s) Tagged: 3 Thread(s)	Huh, I had always meant to ask about the buzzing. Glad I spotted this thread. I always thought it was the AC or the radio, but I'd keep them both completely off and still heard the buzzing. I think it's most noticeable when you go to turn the car off, that's when I always hear it. __________________

10-09-2015, 02:20 PM	#19
paulca Senior Member Join Date: May 2014 Drives: Toyota GT86 Coupe Red (UK) Location: United Kingdom Posts: 554 Thanks: 20 Thanked 291 Times in 171 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Are you sure this isn't the steering lock motor you are hearing? __________________ Trunk = Boot \| Hood = Bonnet \| Sidewalk = Pavement \| Transmission = Gearbox \| Stick/shifter = Gear knob/stick \| E-brake = handbrake \| Windshield = Windscreen \| Turn signal = Indicator

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Corsus Member Join Date: Jul 2015 Drives: Halo 2016 6MT Location: BC Posts: 10 Thanks: 3 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 2 Thread(s)	Oh nice, I've been watching your playlist with your GT86. Nice wrap btw.

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