Ribenaberry1980

Brief update on this problem. I replaced the EGR valve, and the problem seems to have gone! Woohoo!, but is replaced buy a different (but nowhere near as serious) issue. My wife is saying that driving through town, stopping starting etc, the car occasionally hesitates under acceleration. The only code in the system is 16556 - System too rich, Bank 1. So I suppose my question is, as I only changed the EGR Valve last night,(She drove it 40 miles to work) do I need to give the car time to relearn its fuelling etc? before I start smoke testing and checking sensors and the like? Also, Thanks for you advice so far!

Did you get the smoke as well?

So this is a vid I got today of what it is doing. Also, sometimes, under revs, there is a bit of white smoke and occasionally a bit of a rattle? video-1495465905.mp4

Ah, thanks, ill try that to see what it does. Is there an somewhere to find the audi codes? I've looked on Ross tech and haven't found anything for the 2 unknown codes as well as a few other random websites? Thanks for your help.

My wife's 2004 1.6 A3, BGU engine type, has a problem when sat in traffic at idle. The RPM is sometimes lumpy, and sometimes it slowly climbs to around 1100ish rpm before dropping. back down to 700ish and starting to climb again. Then, just to confuse matters, sometimes, it will sit, rock solid at 650-700 rpm. When driving, there is no sign of the problem whatsoever, the car pulls just as well as my 1.6 VW Golf which has no issues. Initially I suspected an air leak, so I changed a bunch of hoses that were cracked/broken including the crankcase breather pipe and the main air intake pipe (from the airbox to the throttle body) and this has reduced the severity of the above symptoms, but got rid of them entirely. I have a few error codes using a small (cheap) code reader: 16891, Idle control system, RPM Higher than expected. 16784, EGR valve malfunction. (this one hasn't returned since I erased it today before a long drive) And 2 codes that I couldn't find definitions for 05523 and 04755. Should the EGR valve be my next point to look at? The car recently had a new fuel and air filter, and had 4 new plugs about a year ago. Any help would be gratefully received!