I wrecked my van, 2001 express,, I've got it back together and running but it's puffing white smoke out the tailpipe. It cranks good, runs fairly good, but white smoke. Its not a blown head or head gasket. What sensors, or fuses or wires could be causing it to do this?
thanks so,much in advance.

 

White smoke is water in the combustion (coolent), no sensors .

 

Check map sensor...

 

I had a Dodge that did the samething, changed the map sensor and problem solved.Really don't know about Chevys, but on Dodge it's on the top right side of carb in the front.