In the past, fuel savers would not work when applied to fuel injection because fuel injection systems are actually designed to prevent efficient combustion! Increasing the combustion efficiency of an engine increases the exhaust oxygen percentage. Most fuel injection engines use an oxygen sensor to infer the air/fuel ratio of the engine, the increased oxygen content in the exhaust is 'read' by the computer to be a lean mixture in the engine. The computer then adds extra fuel to bring the pollution back to 'normal', so it can re-burn the wasted fuel again in the catalytic converter, or hide the smelly rich emission, to put it bluntly. The Fuel Savers EFIE device, helped run your engine at 18/1 , rather than the regular stoichiometric mixture of 14.7/1 This problem led to the development of the Electronic Fuel Injection Enhancer (EFIE, pronounced Ee-Fy). The EFIE allows you to apply an offset to the voltage coming from the oxygen sensor, so your vehicle's computer is completely unaware that the oxygen content of the exhaust has increased. The EFIE manual explains exactly how to build an EFIE, using parts from a Radio Shack. The manual also completely details oxygen sensor function and why the EFIE works. We don't sell the manual, just the soldered up and tested device. Easy to install only 4 wires to hook up. Your Fuel injection system stays original.  EFIE since 1986
* the EFIE is a Narrow Band Sensor for Wide band see below.

We also have Dual EFIE type O2 sensor circuit available in a U-solder kit (DIY) with a box for $35.00
and a soldered up ready to install Duel EFIE for $85.00.
This circuit that allows you to adjust 2 oxygen sensors, or one, buy 2 and control 4 oxygen sensors.

*The Original EFIE is for Narrow band O2 sensors, most cars 92-98, & later models Ford , GMC, for Wide Band sensors : BMW, Merecedes, some Chrysler, some Toyota 97 & newer click here. Wide band O2 sensors, usually have more than 3 wires coming out of the O2 sensor, but not all, check your Clymer manual or All Data.

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