Installation Instructions
Wide Band EFIEs

Install your fuel efficiency device

The EFIE is not intended to be a fuel saver by itself. You should install a device that is designed to get more energy out of the same fuel, such as a hydrogen gas electrolyzer, a fuel vapor production unit, fuel heater, or other device that gets more power out of the same fuel by increasing the efficiency of the petroleum's burn.

Locate the wide band oxygen sensor signal wire

The most important point in installing any EFIE, is to correctly identify the signal wire that the EFIE must be installed on. In general, the easiest way to locate the correct wire is by use of a wiring diagram. If you are doing mods to your vehicle, I recommend you get a full set of wiring diagrams from www.ahdol.com . I think they charge $12 for a full set for your vehicle, and they will usually email them to you in pdf format within a day. Once you think you have found the correct wire, I still recommend that you test for it to ensure that you have the correct wire.

Please see Wide Band Oxygen Sensors for complete information on identifying your sensor wires. You are looking for the current pump wires, which should be around 2.7 and 3.0 volts, or 3.0 and 3.3 volts for 4-wire sensors. 5-wire sensors may differ from this slightly, but will be pretty close. The wire we need is the one that has the higher voltage of this pair. We will call this the "signal wire", and this is the one that we will connect the EFIE's signal wire to.

Locate 12 volt power and ground

You need to ensure that you have switched power, not power directly from the battery. You don't want the EFIE running 100% of the time.

Most of the fuel efficiency devices need switched power as well, and you can then piggy back onto them. Note that the EFIE draws negligible power. You can attach it to any circuit. The best choice for a voltage source is a fuel efficiency device, such as a Hydrogen generator. That way the EFIE only activates when the fuel efficiency device is turned on. Note that when power is shut off to the EFIE, the signal from the oxygen sensor to the computer is not affected. The EFIE has no affect on this circuit when it's powered off.

Ground can be the vehicle body, engine block or ground from another device. Just make sure that whatever you choose to use for ground has a negligible resistance (less than 10 ohms) when tested against the negative battery terminal of your car.

The Wide Band EFIE:

The wide band EFIE has only power and ground connections, and one output wire for each sensor it is handling. Below is a diagram of a Dual Wide Band EFIE. The white and blue wires are the output wires, and each of these will be connected to a wide band oxygen sensor's signal wire. Note, if you are installing a dual EFIE and only have one wide band sensor to handle, then only use one of the output wires. Leave the other one disconnected.

The "signal out" wire connects to your wide band sensor's signal wire as discovered above. Connect the white wire to one wide band sensor's signal wire, and the blue wire to the signal wire of your other sensor. For these EFIEs (unlike narrow band sensor installations) you do not cut the signal wire. Instead, you tap into the sensor's signal wire, with the EFIE's output wire. You cut away some of the insulation from the sensor signal wire to expose the copper. Then you wrap the EFIE's signal wire around it, and solder the wires together. Finally, wrap the connection with some good cloth type electrical tape.

The signal out for both outputs is controlled with a single pot. In the left picture above, the pot is covered with it's black waterproof cover. In the right picture, you can see it exposed. It is a single turn pot. When turned counter-clockwise all the way to the stop, it has almost no effect. When turned clockwise all the way it will add about 5.3 milliamps, which will lean your engine way more than it probably should. Please see the caution in the next section about this. We have no need to read voltages with this device. We just set it for a number on the pot.

Setting the Wide Band EFIE:

I'll start this section with a word of caution. Setting these EFIEs too high can cause your engine to run too lean. Running too lean can cause the valves to overheat and may actually burn them, requiring an expensive engine overhaul. This danger doesn't exist with narrow band EFIEs because the EFIEs are not able to achieve the amount of control that these wide band models have. So you must be careful. If you set this EFIE above 1/2 power, you should consider that you are getting dangerously high.

We should review a little of the basic theory of why we are using an EFIE: When you add a fuel efficiency device, such as an HHO generator, one of the results will be that there is more intake air in the exhaust per amount of fuel. This equates to more oxygen, that the oxygen sensor then detects. The additional oxygen means that the air/fuel ratio appears lean to the computer, and it will react my adding more gas. This causes you to lose some of the gains you should be getting from your fuel efficiency device. The purpose of the EFIE is to counter act this effect. The EFIE makes the signal look richer than it is, causing the computer to lean the mix. The point of this is, that all we are trying to do with the EFIE is to counter the effect caused by your HHO. We're not actually trying to lean the mix. We just don't want the HHO to cause it to run rich.

So take it easy in setting this device on your car. I think you'll find that the correct setting will be between 1/4 and 1/2 power. But the thing to do is to start low, and test your mileage. Then raise it a bit and see if you've mileage improves. Continue to test in this way until you get no increase of mileage, or a decrease. Then go back to the last point that increased mileage. That's where you want to be.

Summary:

If you run into trouble or have can't understand these directions, please contact greentechysystems@gmail.com. We can use your questions and comments to improve the instructions for others. Also log into our forum at www.fuel-saver.org. We have created a forum specifically for our Wide Band EFIEs, where you can read what others have discovered using these devices, and get help and suggestions for your own project.

Good luck with your project.