Popping an clicking after engine is of?

[218army]

Hey Guys-

I have searched every thread involving clicking, popping, and cabin noise, and haven't found anything. I am never in my car to often with the engine off so I haven't noticed it before, but the other day, I was sitting in my car after coming home from work, and i noticed a clicking sound coming from the shifter/center consul area. It sounded like something mechanical or electronic working, almost like a CD player skipping. I thought it was the throttle body aligning, b/c it sounds exactly like that. It goes on for about 15 minutes then stops. Anyone know what this is?

THX

b

[AudiA4Turbo22]

exhaust cooling down?

[04QuattroTurbo]

^ I think Kirk is on to something here. If you are hearing a snap, crackle, pop from the rear of the vehicle to the passenger side, then that's the exhaust equalizing, from very hot to cooling down...weird OP, is this your first car, by any chance? I only ask, because they all do that, I remember on my first vehicle, 1987 Chevy S10, I was in autoshop in school and remember turning it off so I can do an oil change and started hearing the crackles and pop and nearly freaked me out. LOL

[218army]

This is my first audi, but old Corrado never made noise like this. It sounds more mechanical/electronic than something like heat contraction/expansion. I don't believe its coming from back far enough to be the exhaust. I'm gonna test it after work today and see if it still does it if I start it up and shut it down before it heats up to much. It really sounds just like a disk drive skipping. Thanks for your input.

[A4Dit]

I have a similar sound. sounds like it is in the dash, sounds to me like an ac duct valve popping open and close over and over again.

[04QuattroTurbo]

I have a similar sound. sounds like it is in the dash, sounds to me like an ac duct valve popping open and close over and over again.

I get a rumble in the center of the dash when the AC cuts on, which makes everything vibrate, but not after the ignition is cut. I also get a whoosing sound coming from the engine compartment when I power down, sounds like a jet engine cutting off...

[218army]

Checked the noise again last night. Its definatley coming from behind the dash, sounds electronic. It happens even if the car isn't warm as I just turned it over and shut it down and it still made the noise. Maybe something is wrong with the radio?

[phantom b6]

It does this for me too.. definitely from behind the dash. I've ordered a new head unit so when I swap it I'll post if that changed anything

[SlappyB6]

My car makes all kinds of crazy noises when you first turn it on, and after you shut it down. I assumed (after reading several threads about it), that it was the throttle body, like what the OP said. Perhaps I'm wrong.

[AudiA4Turbo22]

i think i know what u mean, if anything it is the A/C ducts adjusting the flaps in the back.

[COOP16]

I get the same noises....sounds like a cd player looking for a track. It has never affected anything with the cars operation but I have always been curious.

[218army]

I'm glad that I am not the only one. and that no one has experienced any problems resulting from this noise. you'd never notice it unless you chill in your car with the engine off a lot.

[A4Dit]

It does this for me too.. definitely from behind the dash. I've ordered a new head unit so when I swap it I'll post if that changed anything

It is not the radio, my car has done it for a while now with the old Symphony II and it still is doing it and I have a Sym II+.

[Gallep]

Things that happen when you turn your car off:

If your A/C is on when you turn your car off two things are going to happen to reference the noises you guys are hearing which is all normal for "aging B6's".
1. Your Blend Air door and corresponding air duct flaps will start closing making that sound which can resemble a CD player looking for a track/CD. Mine sounds like a creaking door.
2. That "whoosh" or "Jet Engine spooling down" sound is your radiator fan free spinning to a stop. Mine sounds like the "Jet Engine" too.

[AudiA4Turbo22]

^^that's What I Said Lol.

[Gallep]

^^that's What I Said Lol.

Well, you kind of said it implying a, "maybe it's that" tone. I just provided a more confirmed and precise answer.

[AudiA4Turbo22]

^^gosh darn it haha.

[aaronz]

Also, could this not be your TB adjusting? I know there is the trick to make it adjust manually but I was under the impression it was always compensating a little bit...?

My car does the same thing btw.

[gq9]

I hear that shit too, sounds mechanical or electrical from dash or engine bay after you turn the car off.

[04QuattroTurbo]

Okay, now that is solved, maybe you guys can help he identify this noise:

Okay, I just started my car...The A/C comes on, with the blower...a rumble happens from the driver's side that is directly underneath the center console and travels to the front of the engine as the blower (fan, HVAC) strengthens. After stopping at a stop sign and idling, the car pulsates, sounds like it is coming from the Dash to the engine compartment. It is a rhythmic pulsation (similar to dieseling). Changed the plugs, Air filter, Use 91 Octane gas, used Seafoam in the fuel tank.

The weird thing is, if I turn off the blower, e.g. take the climate control off Auto and turn it off, it goes away...any ideas?

[AudiA4Turbo22]

^^yes, especially when the car is cold, when ur blower is running it uses engine power to spin the compressor, so it must idle higher and make the engine use more force at a stop to spin that compressor. Hence why they say, when ur A/C is running ur car looses 20HP.

[04QuattroTurbo]

^^yes, especially when the car is cold, when ur blower is running it uses engine power to spin the compressor, so it must idle higher and make the engine use more force at a stop to spin that compressor. Hence why they say, when ur A/C is running ur car looses 20HP.

Kirk, I know that, yes, the idle speed is higher, like 100-200 RPM's higher (that's also used by the emission control system so it will reach the optimal operating temperature, to minimize bad emissions) but even after the idle speed normalizes, it still pulses, but only when the darn blower is on. This happens even with the temperature is at the middle of the gauge.

[a4wd]

Well has anyone tried doing the Throttle Body Reset? It makes the same noise as the one described by the OP. I am assuming that the noise we hear on shutdown of our cars is something related to the TB. If you guys don't know about resetting the throttle, def check out the easter egg thread.

You basically do the following:
a.) plug the key in (Do not turn it)

b.) Keep foot on full throttle

c.) turn Key to the "on" position (radio, aux position)

d.) hold the gas pedal for 5 seconds

e.) Turn off the car, and wait 2min

ENJOY the new and improved throttle response!!!!

[Teratorn]

Wow, I left a friend in the car today to grab a few things in the store. He turned the engine off while waiting and told me when I got back, the car made strange noises. So I started the car, turned it off, and sat there to listen. He was right and I told him I was wondering why I never came across that in here, and here it is! It definitely sounds like the ducts opening and closing, but why would it do that over and over? I can understand if the ducts would open if you had the car on recirculate, but it sounds like it opens and closes quite a few times.

[218army]

Ok, so I had nothing to do last night, so I timed the interval of this noise. It goes on for 21 minutes and 15 seconds after the car shuts off, and happens at 10 to 20 second intervals. I am not sure about the air ducts, because it happens even if i haven't turned the blower on. I have done the throttle body adaptation before and it sounds very similar to that. Seems like this will remain a mystery until it starts messing up someones car.