Reading the archives, I'm reasonably confident the problem would be valve guides dropping, but I'd just like some confirmation :-) I have a 91 Voyager with ~154k miles on it. Apart from this one problem, the van runs *great*. In the last 12 months I've had front and back valve cover gaskets, the PCV value and oil pan gasket and catalytic converter (it was cracked). That work cost a total of ~USD 1000, and fixed a nasty oil leak and smoking problem. The smoking is back through :( There's a "farting" sound coming from underneath the van - my original mechanic (with whom I've lost a little faith) has said, without actually looking at it, that this was because of an exhaust leak. Does this sould like it would be caused by values dropping? Or should I look more at the seals to be the problem?