Originally posted by fdunford:
If it weren't for the stalls I started getting, I'd tend to be in agreement with you. I'm not convinced that a bad precat would cause stalls?
you do not have a precat on a zetec, they are only on the duratec. the cat is bolted right to the exhaust manifold
if you have no codes for the O2 sensors and the only code is for the cat then it is most likely the cat.
at least on the duratec the cat monitor sensor should read about .7 volts at idle, if you graph the O2 sensor with the cat monitor over top the cat monitor should follow behind the O2 sensor when driving, if it doesn't that means there is an issue with the cat. IIRC the closer to 1 volt you are the richer the system and I believe the closer to .1 volts you are is lean, but it might be just the opposite.
- 95 Mystique LS - Zetec/5spd
- 99 Contour SeVT Sport - Duratec/5spd
Official NE-CEG Contour/Mustang Family
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