u wont go into failsafe, but you'll have that damn CEL light on teh dash. it can be solved by getting a 95 ECU and repinning a few wires and basically just converting your car to obd1. i'm kinda through phase 1 of it, i still need to pull the intake manifold and get to the 4 pcv return lines and a few of the stuff i couldnt reach yet, and to actually weld shut the egr hole on the manifold. but that involves draining coolant, etc etc etc, and i know i'll need new intake manifold gaskets on hand since the paper ones will more than likely tear to bits when ur pulling it off the head.