Here is a picture of the EVAP hoses. It looks like it may be bad...

The engine on my A4 is running hard at start up and idle. With throttle it does not sound bad.

Here are my VAG-COM codes:

17519 - Oxygen (Lambda) Sensor Regulation: Bank 1: System too Lean
P1111 - 002 - Lower Limit Exceeded
17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
P1297 - 001 - Upper Limit Exceeded
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 008 - Implausible Signal
16685 - Cylinder 1 Misfire Detected
P0301 - 008 - Implausible Signal
16686 - Cylinder 2 Misfire Detected
P0302 - 008 - Implausible Signal
16687 - Cylinder 3 Misfire Detected
P0303 - 008 - Implausible Signal
16688 - Cylinder 4 Misfire Detected

Thanks for any input.

 

thats a check valve, they go bad all the time but wouldnt cause those problems.

 

Thanks. I am going to replace it or get it replaced this weekend. Any ideas what could make those codes show up?

 

Looks like your DV is going or gone. Get a new one. I had same issue with a BOV. So that would be your best bet. Easy fix. Get a Forge DV or similar.

 

So I replaced both of these (in photo), and it is still idling hard. It sounds better and I hear the purge valve go off now... not before. I still get these code though.

Codes:

5 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 002 - Lower Limit Exceeded
16688 - Cylinder 4 Misfire Detected
P0304 - 008 - Implausible Signal
16686 - Cylinder 2 Misfire Detected
P0302 - 008 - Implausible Signal
16685 - Cylinder 1 Misfire Detected
P0301 - 002 - Lower Limit Exceeded
16687 - Cylinder 3 Misfire Detected
P0303 - 002 - Lower Limit Exceeded
Thoughts? Thanks.