Originally Posted by Fox Fader
I don't think so., I 've never seen that happen. My friends TJ has had a crack in the M-fold for a while now.
As far as checking the O2, I've never heard of that either. Go to www.oxygensensors.com
and order a new one.
Maybe the ECU once realizes the O2 is bad it goes to a base map which will make the engine run smooth, but not be able to make the appropriate air/fuel changes via the O2. Make sense?
Ahh, got ya. But if exhaust is leaking before
the 02 sensor, wouldn't that throw off the a/f ratio as well?
I just looked, and its the exhaust manifold thats leaking, it has a crack inbetween 2-3 cylinders. I just replaced one on my Dakota before I traded it, and had to pull the head to remove the broken studs...