2000 Venture, 3.4L, non-AWD.

I replaced my EGR valve last night. The van is running a little rough, and I want to force the computer to re-calibrate itself with the new EGR valve.

I had an old K-Car once. It's computer would recalibrate itself anytime you maintained at least 50MPH for at least one minute.

Is there a procedure like that for this van?

Thanks!

The computer is recalibrating itself once it goes into closed loop. Did you change the EGR because of a code or rough running? I've worked on quite a few high mileage gm minivans and have yet to replace an EGR valve. Not saying they don't go bad, but I have yet to replace a bad one. Do you have a scan tool capable of reading real-time data? You may want to get one on there and see if it is in closed loop, if the EGR is being commanded to open at idle (it shouldn't be), etc... It could be a gross vacuum leak after the MAF sensor?

No scanning tool.

I replaced it because the computer continuously threw codes for the O2 sensors, even after both were replaced multiple times. No vacuum leaks that I could find. New plugs, wires, filters, etc. The car would surge/misfire when accelerating or under load, and sometimes hunt (and stall) at idle.

Replacing the EGR has helped smooth things abit already, but before I consider the case closed (or still open), I want to make sure that it's calibrated to the new EGR.

How does the computer go into closed loop?

You really need to get it on a scanner that can give you some more info than what you have. Just because you got O2 sensor codes never meant the sensors were bad (you are finding that out now). If you could get it on a decent scanner you could tell what the underlying issue is and fix that. It could very well be a ground issue in the harness that controls the O2 sensors/EGR valve or it could be something completely different. The computer will go into closed loop when the O2 sensors have heated up enough to register properly. Once in closed loop the O2 sensor (and other sensors) contribute to how the ECM controls fuel. When it's in open loop the ECM uses a set table of values to provide fuel management until it goes into closed loop. If you never get to closed loop it won't run very well, you'll get poor mileage, etc...