Anyone know the noise?
 

Anyone know what is causing this noise? Car is not on, just let in ignition. It does not stop and is extremely load as in you would almost have to yell at someone if there beside you. Took video of it below.

https://youtu.be/nmeQzyHGFu8

2016
13,000KM

Yikes ...... this has been the week of strange noises ...... :eyebulge:

So, the engine is NOT running ..??

The ignition switch is ON ..??

Does the sound stop when the ignition switch is OFF ...??

Come back ......;)


humfrz

Correct NOT running, key is just in ignition, happens on full accessory. Should have added its coming from throttle body area (intake manifold).
Video does not justify how loud it is, climate controls turned off so not a blower fan for heating or cooling and not the rad fan.

If it were me, I'd use a stethoscope or hose/rod to determine where the noise is coming from then start pulling fuses or dis-connecting connectors to see what makes it stop.

Bubba suspects the horn is sick and stuck - he says to pull the fuse or rap on the horn with a BF screwdriver .......:iono:

Bubba ain't usually right ...... but, he tries ...... :sigh:


humfrz for Bubba

Why not just drop it off at the dealer? I assume your car is still under warranty at that mileage and MY.

:slap: ....... THAT ain't no fun ........ we're gonna keyboard fix this damn problem ........ :D


humfrz

If possible I try not to go to the dealership for anything I've had issues in the past with other vehicals that had to get legal. It did go in my favour but I hate going to the slime bag place.

Mine has done this ever since I can remember, and from what I diagnosed, it's related to the throttle body stepper motor. I believe you are hearing a particular resonant frequency emitting from the internal electromagnets that are trying to maintain the stepper's position. The reason you can hear it just in accessory is because the engine will mask that sound while running.

I really don't think it's anything to worry about.

I do all my own preventative maintenance myself, so I don't take my car to the dealership either. However, I would make an exemption if something were to fail under warranty. I certainly wouldn't pay for it out of my own pocket.

I hope you get it resolved either way though. Best of luck.

It's just the throttle servo holding idle position. Have someone slowly step on the throttle while you're listening. It's fine.

K thanks for the info guys. I'll try the throttle it should change even if it's a tiny bit like your saying.

That is quite loud. Can you hear it like that in the cabin? Being so close to the firewall I have to figure it goes through pretty clearly.

Yaaaaa.........Jesse36m3 fixed it ........ :clap:

Confirmed by @Ultramaroon ...... so, it must be right ...... :thumbsup:

Yep, I checked mine and it does it too ....... but not nearly THAT loud ......:iono:


humfrz

I've heard some really sing, none of which have failed. The reason I suggested slowly stepping on the throttle while listening is to demonstrate how the whole servo system goes into and out of resonant peaks many times throughout its travel. This is due in part to natural hysteresis of the gearbox between the motor and the position feedback encoder.

WOW! Thanks for the educational background on that ...... :thumbsup:

I reckon the old carburetor "hissed" and a throttle body "sings".

Really, nothing has changed.

The setting, back in the day ....... at the corner garage/gas station. Johnny's parents just got him a brand new Chevrolet for his HS graduation (he graduated first in his class (of 35)).

Johnny pulls into the station, opens the hood on his car, removes the air cleaner from the carburetor and asks Bubba, who works at the station, and dropped out of school, "what's wrong with my car, why is it hissing?"

Bubba replaces his air cleaner, shuts the hood and turns to Johnny, shaking his head, "don't EVER open the hood again ...... just bring your car by and I will check the oil, fluids and tire pressure for you".

THE END


humfrz

PS - Bubba's sister helped out at the station .....:drool:

I used unnecessarily big words again. :( I'm sorry.

Hysteresis can be either stickiness or slop depending on the situation. Basically there's a bunch of mechanically imperfect shit between the drive motor and the position sensor. Depending on how tightly the controller tries to maintain position, it can cause that whistling sound.

You outta be ...... :mad0259:

I'm getten tired of always going to google to be able to read posts .....:(

I got mrs humfrz one of those Echo things, our daughter got her it's offspring, named Dot, for X-Mass.

She is always asking that Alexa girl to do things ...... she is pretty darn smart (I wonder if she is related to google ..... :iono:).

Maybe I should put Dot on my desk to answer questions I have about big words ..... :happyanim:


humfrz

OK, @Ultramaroon ....... It's time for me to go watch the news. Oh, damn, I guess it will still be about women marching ......:rolleyes:

What the hell do they want THIS time ......:iono:

It seems they just have to get up in arms every few years ..... like they have been doing for years ...... and some of them are STILL not happy.

humfrz
:scared0016:

They just need to find themselves good husbands.

:scared0016:

Hum's ex wives


http://www.ft86club.com/forums/attac...1&d=1516604569

Wait just a gall darn minute ........ I have only ONE ex wife ........ so far ......:iono:


humfrz

OK... All the girls from Hums back in the day stories.


http://www.ft86club.com/forums/attac...1&d=1516604569

Well, OK ....... that's the reason I have moved so often ...... :eyebulge:


humfrz