Actually no (that's where I originally checked for the leak). The spot that was leaking was back here, approximately where the image is pointing to "Boost Line 1":


Where that L-shaped port connects to the back of the impeller housing, there was a lot of freeplay. It seems as though that port had come loose somehow and could easily be wiggled. Excess air was then being sucked into the intake (I think). I noticed that after I sealed that connection up (right where the port fits into the cast impeller housing), the truck ran much smoother at idle, and the code cleared itself after exactly two drive cycles. AWESOME!

A year and a half worth of dealership BS, expensive parts, and many many nights laboring away under the hood of my truck was cured by a $5 tube of hi-temp silicone!!!! <img src="/forums/images/graemlins/notooth.gif" alt="" />