Iceman12

Hey, it is my understanding that the MIL eliminators require not only that your rear O2's be plugged in, but that they also be installed in the exhaust. The MIL eliminators are nothing more than a filter, they dumb down the movement of the voltage back and forth so it no longer matches the front O2's signal which indicates to the computer that your cats are working because the cats are changing the gases going by the 2nd O2 sensor. This allows you to have no so great cats, or no cats, but the computer believe you to have them.

It sounds like you have no holes to install the o2's into, so you will either need to replace the mid pipe with one with the proper holes, or have the holes installed, or purchase a hand held tuner/ get a chip installed and a dyno tune) to have the rear O2's turned off so the computer will stop looking for the sensors and the codes will go away.

You should do one of these things, because Ford computers go into "limp" mode when the check engine light is on, that is the computer stays in open loop, or ignores the front and rear O2's signal, because it decides that if one O2 sensor is bad, all the others could be bad too, so it won't trust them. Instead it uses complex tables programmed at the factory to decide how much fuel to use, this and it retards your engines timing to be completely safe form hurting the motor, but it gives u less power and a rich mixture that can cause your hiccup.

I have experience with this, i have a 97 Cobra, and used MIL eliminators for a while when i got my OR pipe, then got a dyno tune and had the rear O2's turned off. No problems since then, except for when i got to go through emissions again.... but I'll prolly just put the stock h-pipe back on and pull the chip off the computer for a week to set the monitors, take the test, put the other stuff back.

So in short, either make it so u can install rear o2's or turn of the rear o2's via tune to get more power, better economy, no codes, and possibly fix your hiccup. BTW, nice Cobra, hope ya find a new hood soon though.


Whoa, somehow I totally missed your last post..... sorry bout that.

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1997 Mustang Cobra
Crystal White
Mods - 3.73 gears, MGW short shifter, slotted rotors and HP pads on all 4 corners, Eibach Pro-kit, Mac O/R H-pipe, Flowmaster catback 40 series, UPR Powertube, T-56, Zoom Stage 4 Kevlar clutch, full adjustable clutch cable set-up, Alum driveshaft, Rims + Tires

Full-length MM subframe connectors waiting for install.