If it has cracked it is most likely from the excessive engine rocking caused by the soft engine mounts.
I recently had cracked mounting studs on the manifold of my Durango. It let in just enough outside air that the O2 sensors were fried, triggering the CEL. It also seems that the sensors are designed to pick up some pretty subtle differences in O2 flow, and the Venturi effect alone would draw in considerable outside air... That's my reasoning, but then again, I'm not an automotive engineer either.No, unless the crack was so big nearly no exhaust was flowing past the O2 sensor it will not notice anything.
When it sucks in air then the O2 sensor will show lean.No, unless the crack was so big nearly no exhaust was flowing past the O2 sensor it will not notice anything.
A cracked manifold should throw a CEL because the O2 sensors will detect the air leak...
That is unlikely....Another thought that has been going through my mind is fuel injection cleaner. The same Lucas brand corroded prematurely a clamp on my other car. I suspect it is not the manifold that is cracked, but rather the manifold gasket.
Travis,I've had my stainless steel exhaust on my Esprit welded 4 times now for $40 each time at a local muffler shop... Much cheaper than $1500 fora new one...
I would mark the relative position of the parts with a sharpie, and take it in to get it welded at a shop.