Since I got my 2001 S4 back in 2007 I've noticed a weird issue. Kind of hard to explain so I will try to do my best.

When I activate the cruise control and the car is going down a slight hill the car bucks as the car tried to maintain a constant speed. It's like the car can seem to let on and off the throttle smoothly. You can watch the boost gauge and see it bounce around pretty crazy.

I had a the APR software and could only lessen the issue when I switch to the stock ecu program... but the problem was still there just not as bad. I always thought that maybe it was just poor programing on APR part. When my ecu died last month and I got a new ecu with the MTM software the problem was still there. So I don't believe it's a ecu issue... but I could be wrong

Other then replacing the cruise control module I'm not even sure where I should look to try and fixed this... or maybe I'm going to just have to live with it.

If any of you have any ideas let me know. Thanks!

 

anyone?

 

I'm still running into this problem. I just went on a 5 hour drive and this is driving me crazy. I just check and have no codes as of this time. I've noticed this problem even with out the cruise control on. It happens a lot when I just have barely any throttle on. Right between idle and a little throttle. Seems like it is some sort of fuel delivery problem. I just don't no where to start with no codes. Any suggestions would be great!