rusted noise
 

Hi

When I floor the pedal I can hear rusted noise(like screwing rusted nut) for 1/2 second.

Anybody have an idea what could be?

A8 d3 2003 3.7 petrol


Thank you

Check the kickdown switch behind the pedal? Might be loose or broken.

HI

Thanks for a reply I will check the kickdown switch.
It sounds more like from underneath of the car,,,between the engine bay and transmission. Is very hard identify where is coming from or just record the noise.
Noise in a level of : rpms between of critical and over-critical rpms, kind of resonating or as i said screwing rusted nut on the screw.

It does not happen when pressing the pedal slowly,,only while flooring the pedal firmly.

Thank you

Possibly propshaft CV joint when put under the strain of a kickdown?

Kick down switch operating as normal.
not sure about the CV joint as the noise appear even when cruising on 50mph and then just floor the pedal..1/2 second of noise and thats all.
I might not be correctlty describing the noise i getting.
If someone lives around SE/Lewisham I can pop in and floor the pedal for you.:o

Very long shot, but can it be low on gearbox fluid ?

If so, it can cavitate under acceleration and the bubbles in the oil make a brief whistling sound.

It would be more prominent when cold, and would happen at idle revving in park as well as when driving....

I thought about the gearbox oil but wanted to clarify frist before stealer takes £230 for gearbox oil + filter.
It makes the noise whether is cold or hot but only when you floor it at any speed..1/2sec of wriiim or sort of:ROFL:
I never floored the pedal while in idle but did rev it up to 4k but no noise.
is barelly noticeble and passanger dont notice the noise..only when I ask did you hear it?? what?? that wriim..nooo I did not...once I floor it 2x they say oh yes..:ROFL:

Hmm... maybe its not the fluid then.

But defo don't take it to a stealer, or get a full flush at this stage.

You just want the level checked and topped up if necessary which any competent gearbox specialist should do for a fraction of that cost.

I preffer to watch what is getting done on my car or even better getting it done by myself however I have a driveway only not a ramp:ROFL:..Sometimes mechanics taking shortcuts when is a dirty job, like a droppoing the gearbox pan cleaning, changing the filter. When I say change the filter even is no need doing they might say we did that..few months later you go under the car and you realize the pan has never been taken off :ROFL::ROFL:

Could it be a noise that can be described as an owl hoot? Is the car fairly high mileage? If so is likely known issue with the gearbox which requires replacement of the oil - ie full flush and replacement with a different grade of ATF, lifegaurd8 or some such. I believe the noise is the Torque converter clutch slipping. Is it particularly prevalent going in and out of third gear?