dfw

re-rx7 · 02-07-2014, 12:44 PM

Originally Posted by DirtyD

You, you will need a tune when you delete the cats. If not, the car will run open loop and just dump fuel trying to cool the cats that aren't there anymore. You will run rich and get horrible gas mileage and a putrid smell.

Your talking about COT protection. It only happens on Decel. Rear 02's do not control anything. they have a voltage reading of .1 to 1. The front Wideband 02's read .1 to 5 volts they would tell the ecu to run in open loop.