Turbo spools when Idling.??? When I do a cold startup there is sould that sounds like the turbo spooling. and the engine seems to be reving higher then it should be and then after about a minute it all settles down to correct level anyone elses car do this or know why?

 

when you do a cold start the engine idles high to quickly warm up a few key components of your system. the turbo is deff not spooling at idle. it may be spining but not forcing any air.

 

the turbo is always spinning, but not making boost. The higher revving is the secondary air pump getting the engine up to operatting temps as fast as possible. When it goes off, the engine is warm and the revs drop

your old car didnt have it

 

something is makin like a high pitched wistling sound then it shuts off.

 

its the secondary air pump.

 

^^^^^like he said, replace it with a new one and the noise will go away. Its located under the airbox.

 

He would have a code if it was bad. Also his previous A4 didnt have it so it is new to him and thats why he thought something was wrong.

 

Ya I was jsut concerned that it was something that could be a product of accidentally reversing the polarity. (pay atttention when changing the battery always. terminals are not always on the same side.

 

Its making an abnormal noise.

I dont care if there's a code or not, its not functioning the way it was intended.........quietly.

So, its bad.Sometimes its a break/split in the hose connected to it.Sometimes they can be cleaned, or just replace it if the noise is a bother. Or just whine on down the road and don't worry about it until it fails the rest of the way.

 

i get that cel a lot . is it a vital component? it says something like secondary air pump insufficient flow not 100% surethats is it.
how much do they go far please help