EFIE: Electronic Fuel Injection Enhancer, Described
As you can see from the title, EFIE stands for Electronic Fuel Injection Enhancer. It was developed for fuel injected vehicles, and was found to be necessary in order for other fuel efficiency devices to work on them. This includes virtually all cars and trucks today.
An EFIE is not a fuel efficiency device on it's own. If you only added an EFIE to your car, with no other fuel efficiency system, you might gain a few mpg, but you also might not. The reason is that you are changing the car's computer and making it run out of spec, or differently than what it was designed for. The EFIE was designed to make the car run according to spec after another fuel efficiency device has been installed.
The purpose of the EFIE is not to provide fuel efficiency. It's purpose is to make it possible for other fuel efficiency devices to work. Basically a fuel efficiency device makes the engine think something is wrong, and makes it do things to adjust for this "wrongness". The actions it takes based on the oxygen sensor data, makes it negate the efficiency increase that would have been realized by the efficiency device. The EFIE solves this by adjusting the signal to the computer so the computer is happy with the readings it's getting and it's making the correct adjustments for the various conditions of the engine. A more detailed description of how the EFIE does this can be found here . But basically, the oxygen sensor tells the computer it's oxygen readings by providing a voltage between 0 and 1 volt. In order to adjust this "data" the EFIE adds a small voltage to that delivered by the oxygen sensor. The EFIE is highly adjustable. Adjustments to the trim screw can change the EFIE's voltage correction by tiny amounts; a millivolt or 2 (.001 volt).
The EFIE works on a delay. When the engine is started, the oxygen sensors are cold and do not send correct data to the computer. We don't want to modify this data until the sensor is operating correctly. The EFIE will build up to it's rated voltage offset over 3 to 5 minutes, longer in very cold weather. Also, when you turn the vehicle off, the EFIE loses it's voltage offset slowly. This means it will more quickly jump back into full operation if the car is re-started again after a short stop. This is by design, but you need to know about it when trying to adjust your EFIE. When you make a change, you'll see your meter start changing, and keep changing after you've stopped turning the adjustment screw. The bulk of the change will occur after the first minute, but if you have a sensitive meter, you will see it minutely increase for up to 10 minutes.
In practice, with a good fuel efficiency system installed, you might want to have the EFIE adjust the signal from about 250 - 400 millivolts. For complete installation instructions, see EFIE Installation Instructions .
If you would like to purchase a pre-built EFIE, you can find it here , as well as a Dual EFIE unit, designed to handle 2 oxygen sensors here . Both of these units have been designed to be economical, easy to install, and easy to adjust to your particular car and fuel saver combination. And they come with full money back guarantees.
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