I have noticed that when i first start up in the mornings. That i sometimes have a rough idle.Even once it`s warmed up. It has a slght miss in gear. I notice it at stop idle only. However at times when at say 40 to 55 and I let off i can feel surging or then when i give it gas again it stops. I have noticed it still doing the surging at very very light accelaration between the 40 to 55 mph range as well.No other misses at higher rpm`s or anything like that. I have gotten a few o2 bank 2 ses lights. But i thought it might be from a leak. That i have on the right side slp header which i have a hard time locating as it comes and goes.mostly when it`s cold. or when i drive it and let it sit a few min`s and first star it again it really sounds off for about 10 seconds.But not all the time could this be the source of my whole problem? I have also noticed about a 2 to 3 mpg drop in my fuel mileage. at times. Which is not normal for my car.Other than this the car run`s great.This is on a 96 SS A4 car. Any help or thoughts on this? Thanks For Your Time. Mike...

 

Anybody?????

 

TTT

 

The EGR valve would be a good place to start. You may need to pull it off and make sure it is not carboned up and sticking.

 

Would it not thorow a ses code if i was having troubles with the EGR? The only code i am getting is the o2 bank 2 code. How involved is changing an EGR on these things? and where is it located at on my car? Thanks For Your Time. Mike...

 

Come on you all. I know someone out there knows more on this type of thing. Mike....

 

It is located on the back of the intake manifold. There may not be a code unless there was something wrong with the solenoid or sticking of the valve could result in a related code-perhaps your O2 code.

 

Thanks Shoebox: I will start there it sorta looks like a P.I.T.A. to get off. but gotta start somewhere. Thanks. Mike...

 

Still open to other ideas as well keep them comming.Thanks. Mike...

 

TTT

 

Anyone elese got an idea on this? Thanks. Mike...