Ball in a can kind of sound from back of engine? What's going on?

B6/7 S4/RS4
#1

Recently, I’ve been getting a code for one of my o2 sensors. So I did some googling on the code(s) and found a suggestion to check the connections. So what I did was clean them up with a cleaner for electronics I had, waited till they dry and plugged them back in.
Then I also did a throttle body adaptation via vag-com.

After starting the car and pulling it around the back of my house, I noticed a weird idle. So I took for it a spin around the block and the car seemed like it was about to stall when I stopped. The idle is rough.

But what I also noticed is that I’m getting a sound that seems like a ball bouncing around in an empty can?

You can hear it in the following video:
http://s114.photobucket.com/albums/n245/Coderedpl/?action=view&current=VID_20120531_122947.mp4

All i have are piggies, magnaflow catback, JHM tune and K&N filter

I’m still under CPO warranty, should I be concerned?

EDIT: I went back out to the car, scanned it more, and for shits and giggles ran through all the output tests. Shut it off, restarted, took it for a drive and it seems OK? It seems that I heard the sound one more time afterwards but the car seems to idle fine now? WTF?!

EDIT #2: Everything is back

#2

That sound is odd and your description is accurate, it did sound like a ball in a can lol. Other than the throttle body mechanism going through it’s exercise, I can’t imagine what that could be. Especially since it stopped and hasn’t come back. Sounds like the throttle plate cycling to me - other than that guess i have no clue. The weird idle could have been from the cleaning of the o2 sensors etc. It may have taken a bit for them to readjust and get accurate consistent readings.

#3

Already replied on AZ, but I’ll say it again. Broken guide

#4

If the sound comes back see if it changes when your RPMs increase. In other words rev it up and down slowly a few times while filming.

#5

I thought that wasn’t possible?

#6

Doesn’t that go with the b8 cars?

#7

you hope so!

B6JOES4 is obsessed with the timing components.

“Weird sound from the back of my engine”
“GUIDES”.

“Car feels sluggish”
“GUIDES”

“Sunroof is leaking when it rains”
“GUIDES”

“Blew a tire on I-90 last night”
“GUIDES”

#8

Does it not sound like a broken guide to you? It sounds exactly like apat’s car did

Don’t fool yourself, the timing components are a major flaw of this engine, and you can’t just overlook them because you think it’s a rare issue that only happens to a fraction of S4’s.

#9

Definitely sounds like something is bouncing around in there. Good luck either way.

I think the ECMs used in the B7 and older cars use older technology so it is harder for Audi’s background software to realize changes have been done. If I remember right Audi’s TSB said something about the 2008 models were where they started the checking and other models would be added on later. Think about it this way: most all the 2007s should be out of factory warranty by now and CPO repairs have stricter guidelines so most of the warranty claims are going to be for B8 models and newer where their software can pick out the ones that try to squeeze by.

#10

I never said any of that.

I said you’re obsessed.

#11

I wonder what the deal will be on this. I spoke to a tuner and they laughed at TD1 as it relates to the B6/7 saying that it can be made to show Audi whatever the tuner wants Audi to see.

Not sure on the B8 S4 and so on.

#12

But…as you pointed out to me, or reminded my senile ass, a quick log while driving an RS will determine right quick if it is tuned. Throttle posisition % below 5Krpm, I/M flap position below 5K etc. I realize a dealer probably won’t do this to determine if the car has a tune but it seems like an obvious somewhat quick check, no?

#13

sounds like a cam adjuster struggling. and that would explain the choppy idle and stalling. i really doubt it’s a broken guide.

#14

There was an engine torque test that I had to do like three times before I left the dealership. It made you drive the car WOT to see if the engine torque went over what it should be. None of those cars were modded so it didn’t show anything past the spec but it would be interesting to look at the measuring value block on a heavily modded car in turbo mode using a vag-com. I wonder how far off the measuring value block is from what you are actually putting down.

#15

Wouldn’t he have the typical code that goes along with that, and probably a flashing CEL for the misfires?

#16

The only codes thrown were related to o2 sensors and idle rpm too low

#17

is it drivable?

#18

I guess so but I am thinking more with respect to flashing back to stock before service

#19

‘actual torque’ is a field you can log in Newton meters. It reads a bit lower than crank torque and higher than a dyno proper

I logged it on my car and converted to lb ft and then made a torque and HP plot

http://audirevolution.net/addons/albums/images/744079309.jpg

#20

Stop thread jackin