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Welcome to Allpar!
I think a good first step would be determining what the smoke is-- what color is it and what does it smell like?
It would also be a good idea to pull computer codes, either by the "key dance" (works in my 2005 Caravan) or a reader.
 

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KOG, I assume that you're talking about the key dance. Chrysler apparently retained the functionality for a while after OBD-II came online. Instead of a blinking CEL, the digital odometer reads out the codes, which are OBD P-codes, not the old 2-digit ones, and then "dOnE" to indicate the end of codes. My buddy has a '97 Wrangler that seems to have the old 2-digit codes, though.

EDIT: Just to make sure I wasn't remembering things wrong, I went out and disconnected the MAP sensor on the van. Sure enough, I got a CEL and came back with P0108, which is a MAP code that could result from an open ground, according to OBD-codes.com.
http://www.obd-codes.com/p0108
 

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Blue smoke is oil of some sort. If the car isn't having running issues or experiencing bad fuel economy, I would suspect something like valve guide seals, as IC mentioned. These were major problems for the earlier Mitsubishi-sourced V6 engine, the 3.0 used in the extended K-cars. I think the issue may be minor enough at this point that the volume of oil is only enough to make smoke noticeable when the car is stopped and idling with the increased idle RPM from the A/C, but not when the car is moving, as the air moving around and under the car blows the smoke away (i.e. it's still smoking, but you can't see it).
The valve guide seals are more of an annoyance than anything else. I would say you can wait to do them until the oil consumption is too high to be acceptable, the smoke becomes an annoyance or causes you to fail emissions, or the heads have to come off for another reason. The rear bank in particular is tight, as I'm sure you know.
 
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