A Research Organization That Develops & Distributes Practical Energy-Saving Methods & Devices

Electronic Fuel Injection Enhancer (EFIE) Device

Electronic Fuel Injection Enhancer (EFIE) Device

Hook it up and drive! Adjustment is simple.

When combustion enhancement technology (fuel savers that actually work) are applied to engines, the faster and more complete combustion of the fuel results in higher oxygen percentage in the exhaust.

Your vehicle's computer 'infers' more oxygen in the exhaust to be a 'lean' mixture and ADDS additional fuel, negating any possible mileage gains.
(see EFIE Manual, sold separately, for full explaination)

The EFIE allows you to customize and 'correct' the voltage signal coming from your oxygen sensor; so that your computer doesn't know there is extra oxygen in the exhaust.

The completely assembled EFIE connects directly to your oxygen sensor and is compatible with ALL oxygen sensors. You need one on each oxygen sensor mounted before the Catalytic Converter.

The EFIE allows you to retain all your power and performance while taking advantage of increased mileage. No matter what fuel saver device or method you use on your fuel injected vehicle, you'll need the EFIE to unleash the full potential of the fuel saver.

The EFIE alone can save 5% - 10% on your fuel bill, simply by 'leaning' your fuel mixture. We do not consider the EFIE to be a fuel saver on it's own. The EFIE is designed to be an ASSIST for fuel savers.  We do not consider any technology to be a practical fuel saver unless it can save at least 25% on at least 75% of vehicles!


Actual mileage gains depend on the capability of the fuel saver(s) you apply to your vehicle.

SKU ER1-D1-0020 • 0.4166 lb / 189 gm
Installation & Operating Instructions (Included)
ISBN 1-895882-32-X • 8.5 x 11

Regardless of what you read elsewhere, we have discovered that the EFIE works on ALL types of oxygen sensors, including Titania (varying resistance) sensors, A/F sensors and wideband sensors.  Details are in the EFIE Resources.

The EFIE Installation and Operation instructions are no longer included with the EFIE. The latest and most recently updated Installation and Operation instructions are available as a download from the EFIE Resources.  You get automatic access privileges to the EFIE Resources when you buy an EFIE Assembly Kit or this fully assembled (and tested) EFIE.

Eagle-Research does Not make an EFIE that controls more than one oxygen sensor. Since nearly every component on the circuit would need to be duplicated anyway, it makes no sense (to us) to stock two different versions of the same circuit. One EFIE per oxygen sensor also allows the customer flexibility during installation.

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Fuel injection enhancer


Basically in fuel engines we have found different features were added that helps to increase the efficiency of our engine. Through the help of fuel injection enhancer we are able to make our engine effective and it also helps to customized the correct voltage signal of our engine.
Mini Cooper repair Centennial, CO

Congratulations :)

Well I must congratulate you on this little $60 item as in the past i've bought multply ones of these that claim to do the same and including an electronic one that cost me $400 LOL and guess what yours is the only one that actually worked LOL.. I wonder why?

EFIE Price

We've (through mass production, Made in North America) been able to reduce the price of the EFIE.


This is easy to install, easy to calibrate and does its job very well. I installed my EFIE on a \'97 5spd manual Ford Escort. If anyone tries this on the same car, just to save time, the right wire is grey/green, the computer is under the ash tray, and to double check you have the right wire at the computer, the O2 sensor you\'ll want to tap into is in the front of the engine bay under the hood, not under the car. I don\'t smoke, so when I got done installing the EFIE, I looped the wires from inside the console under the ash tray and set the EFIE in the ash tray and closed the drawer on it. When I want to fiddle with the adjustment, I can just pull open the ash tray and there it is. Otherwise, it is out of the way.

Guarantee All Eagle-Research products are sold with a satisfaction guarantee. If you are dissatisfied for any reason, return the product(s), in resaleable condition, within 60 days of receipt of the product(s) for a full refund of the product(s) purchase price. Shipping and handling fees are non-refundable. Virtual Products are non-refundable after initial download.
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