Very Important!

      On most fuel injected gasoline engines it will be necessary to install an Electronic Fuel Injection Enhancer (EFIE) for the system to operate correctly and achieve maximum efficiency.

      When a supplemental hydrogen generator is installed on an engine the hydrocarbon based fuel is burned more completely. One result of the more thorough combustion is that there is more oxygen and fewer unburned hydrocarbons in the exhaust stream. While this is what we are trying to achieve, it can cause a problem on fuel injected vehicles.

     Fuel injected vehicles are equipped with sensors connected to a computer to monitor and maintain the correct air/fuel ratio. One of the most important sensors is the oxygen sensor. Most fuel injected vehicles have one or more oxygen sensors installed in the exhaust stream and the computer determines the best air/fuel ratio based on the amount of oxygen detected by the sensors.

     Basically, the computer interprets this as "not enough gas" and directs the fuel injectors to increase the amount of gas to the engine. The oxygen sensor tells the computer the oxygen content by means of voltage on it's signal wire between 0 and 1 volt. 0.45 volts represents the correct ratio. Higher voltage means the mixture is too rich, lower means it is too lean. By adding voltage to the sensor's output we can compensate for the additional oxygen. That's what the EFIE does.

     Most engines have oxygen sensors both in front of and behind the catalytic converter. The ones behind are used to determine if the converter has gone bad but do not affect the air/fuel ratio. EFIEs are only needed for the sensors in front.