Knocking Noise From Back of Car

[Straz85]

I have this knocking/tapping noise that comes from the back of my car when I am not moving, I also had it in my Jetta. Seems to be only when I'm not moving, I have even noticed it when the car is off. Never heard it in the GTI, but I did regularly in the GLI and the TT. Any ideas?

[TT225]

We had this discusion on a TT forum i'm on. One theory is that the TT-225 has an inverted "U" gas tank. Because of this design the fuel level in each half must be equalized to give an accurate reading for the fuel gauge.

Here's the link from audiworld.
http://forums.audiworld.com/tt/msgs/959413.phtml

[Straz85]

Originally Posted by TT225

We had this discusion on a TT forum i'm on. One theory is that the TT-225 has an inverted "U" gas tank. Because of this design the fuel level in each half must be equalized to give an accurate reading for the fuel gauge.

Here's the link from audiworld.
http://forums.audiworld.com/tt/msgs/959413.phtml

Well I'm glad it's not just me. Does yours do it? The gas tank explanation seems to make the most sense so far, none of the other explanations there would replicate the noise mine is making in the situations it's making it in.

[shedpress]

moving to General Audi...come on brettster!

[rronnicc]

check for hookers in the trunk, they usually make some racket...

[TT225]

Yea, my car makes the same noise, my Jetta did it too. i assume it's one of those VW/Audi mysteries that will never be solved.

[Straz85]

Well I can deal with the noise, as long as I know it's nothing wrong. Engine noise I don't worry so much about, but something from the back of the car confused me

Originally Posted by silverGTI

moving to General Audi...come on brettster!

I put it in MK4 because it did it in my Jetta too and the TT is on the MK4 chassis.

[shedpress]

Originally Posted by Straz85

Well I can deal with the noise, as long as I know it's nothing wrong. Engine noise I don't worry so much about, but something from the back of the car confused me

I put it in MK4 because it did it in my Jetta too and the TT is on the MK4 chassis.

gotcha.

[fuzzy337]

Originally Posted by rronnicc

check for hookers in the trunk, they usually make some racket...

Maybe it's the Saigon whore that bit your nose off. [/Dirty Work]

[SleepyHeadGTi]

Originally Posted by rronnicc

check for hookers in the trunk, they usually make some racket...

That's what was making noise in my hatchback... one of them was still alive....

[s18t]

maybe you have the trunk monkey and didnt know it

[EastCoastVw97Vr6]

iv just picked up this audi a week or so ago and it has this hum that comes from the right rear of the car does anyone have an idea what the hell that would be

[mrfree]

Originally Posted by EastCoastVw97Vr6

iv just picked up this audi a week or so ago and it has this hum that comes from the right rear of the car does anyone have an idea what the hell that would be

I've the same problem on my A6 (1995 ~225000Km) the problem can resides in the wheel bearings (as supposed here)
In my case if I drive on an highway at about 140Km/h for about an hour the problem disappear but it re-appears when I return to drive at about 50Km/h