Also of interest is the fact that this is the second time the coil packs have been replaced in the car's history. A similar repair was made under a recall campaign early in the car's life before we owned it. The “F” in the VAG part number indicates that we our now on the 6th revision of this component.
Another interesting thing that we've learned while looking into Audi cam follower issues is that the 3.2L V6 and 4.2L V8 versions of this motor both employ a roller follower setup to drive their high pressure fuel pumps off the cam. Why the same solution was not employed for the 2.0T engines we'll never know for sure. But our speculation is that it probably came down to a dollars and cents decision.
We promise, the fun parts are coming! Dealing with the hesitation/misfire and being certain that our cam follower was in good shape took priority. We now feel ready to move in a more performance oriented direction. Recently we've come across someone with a 6MT S4 wagon so it might be possible to do a little informal comparison testing to see how our future power mods work to close the horsepower gap. Stay tuned!