> replacing the cat
> on a 98 Dak with a "test" pipe (which would only be used in a fully legal
> manner, of course). Would the computer freak out from the O2 readings?
I don't have access to the OBD-II spec right at the moment, but that
post-cat O2 sensor is there for a reason. I don't know if the spec
dictates ECM response to no change in the pre- & post-cat sensors, but
something will happen.
Isn't the post-cat sensor there to detect a failing cat? I highly
doubt that the response to a failing cat is to shut the engine down,
rather it might only be used to fire the Check Engine indicator.
The cat removal should result in a backpressure decrease, which will
affect exhaust tuning. My guess is not necessarily for the better, at
least as far as low RPM torque is concerned.
Ron
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:09:48 EDT