Witt_4rings

I've tried researching my symptoms and noise is related to SAI pump, but doesnt that only come on when its cold? Winds down when i turn off the car also.

ECS Tuning-Audi

A bad SAI pump when it starts to fail will be pretty noisy. Could also be a cooling fan kicking on.

Pop the hood and see if both fans are running when you experience the noise.

I get the winding down sound when I turn my vehicle off as well. It's usually just the cooling fan.

Jason

jvargasl

Yes, secondary air injection pump. Easy to change and not expensive if you buy that in a scrap ( about 60 )..

Witt_4rings

Sorry for late response. Okay so I popped open the hood, turned on the car, then hurried to the front of the car. Then took a flashlight and saw that both fans were running, but no noise. Turned off the car. Heard the noise winding down and both fans were running. Noise did seem to stop when fans stopped but maybe it was just coincidence. Not sure.

lyleswk

Lets separate the 2 issues:

1) Agree the SAI can make a "jet" noise when going bad, so that might be your problem. BUT...
2) If you car is cold and your cooling fans are running (the 2 fans at the front that that you can see turning...you can't see the SAI turning ), it is something else. It could be your green coolant temp sensor at the back of the engine or the fan control module. So, what exactly was you coolant temperature and setting on your A/C (i.e. was your ECON button pressed or not).

Witt_4rings

Coolant temp was like zero. Car was sitting all night and had a/c at 75 farenheit.

This morning in Chicago was 25 f and fans didnt run and no noise. My a/c was set to HI

lyleswk

Very hard to tell, but it sounds like your temp sensor is awry, not your SAI.

Witt_4rings

Well since its not that expensive I'll replace the temp sensor then if that doesn't fix the problem I'll be closer to a solution. Thanks guys! You da bomb

lyleswk

Should have added to replace with OEM, not Chinese or other knockoff