If you do not have a cat then run it in open-loop, meaning no signal being feed back to the DME at all. If the mixture has been properly set and you have everything in working order these cars run best in open-loop just like the Euro 'Rest of World' cars run.
You can just disconnect (unplug) the stock sensor but better yet I'd unplug it and remove it from the exhaust stream.
To be clear, do not connect the white wire at all and do not run a stock sensor if you do not have a Cat.
Quote:
Originally Posted by tmaull
Sal,
A while back you said if the car didn't have a cat, it ran better without the O2 sensor plugged in. Did you mean leave the Narrowband O2 sensor in free air or would you recommend just not connecting the white wire at all?
-Tom
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