Thanks Sundar... By profession I'm a software engineer, and I've written control loops for robot motor controllers and radio transmit power controllers. They aren't cars, but they feedback loop control theory is the same. <img src="/forums/images/graemlins/cheers.gif" alt="" />

Most of my experience with cars has been basic maintenance and mechanical work - replacing seals, alternators, starters, half-shafts, brakes, etc... My '98 XJ is the first major rebuild/modification I've tried.

Anyway, tomorrow I'll see if I can track down an analog multi-meter and check the 02 sensor voltage. I think they may still carry them at Radio Shack (which is conveniently 2 minutes from my house). I already have a digital one, but I agree the analog one would be better for this. If that doesn't seem to turn up anything I'll see about getting another OBD tool.

My DrawTite 2" front reciver came in today, so I'm going to have to mount that up tomorrow too... Going to be a busy weeked! <img src="/forums/images/graemlins/smile.gif" alt="" />

I'll let you guys know if I find out anything new!

JW