DC2000 – Installation Manual 23
HHO Plus, Alternative Energies, Lta – Travessa das Serras 33, Vieira de Leiria, Portugal – Tel. 00351244697116 – Email: info@hhhoplusgas.com
The engine computer adds more fuel. If the level of oxygen in the exhaust is too low, the computer decides
that the engine is running too rich (too much fuel) and subtracts fuel accordingly.
This process is continuous - the engine computer constantly cycles between slightly lean and slightly rich to
keep the air/fuel-ratio at the optimum level. If you look at the front lambda sensor voltage signal, it will be
cycling somewhere between 0.2 and 0.8 Volts (see lower picture)
For these sensors we should install the lambda sensor extender and also isolate the sensor body.
Rear (downstream) lambda sensor
Rear or downstream lambda sensor is located after catalytic converter. It monitors the efficiency of the
catalytic converter. In the past, and in most cases the downstream sensors are not used in air/fuel ratio
calculations. Therefore they do not need to be treated. But we are finding quite a few cases where that's not
true anymore. Some car manufacturers are using the rear sensors as part of their air/fuel ratio calculations. It
is now a primary suspect when fuel mileage is not being achieved when the steps above are all found to be in.
So we advise you to also isolate the sensor body
Resetting the ECU
The ECU of your car is the brain using mapped data to work out the optimum control conditions for the
engine. According to the day to day driving conditions the ECU builds a memory data base that helps it to
decide the course of action that should be taken by the engine to ensure an ideal drive.
Even though you have made modifications in your car, the ECU still continues to get an input of the old data
which is stored in its memory. This old data no longer is credible as it pertains to conditions that existed
before the modification. The input data to the ECU should pertain to the post modification situation of the
components and parts introduced, while making the modification.
This means that you have to erase the old data from memory and new data pertaining to post modification
should be logged into the ECU memory by mapping in new readings. This is the reason why ECU resetting is
essential for optimum performance after any modification has been carried out in your car. The moment
you have carried out the modification you should purge out existing data in your ECU’s memory. You should
then feed in fresh data pertaining to the conditions that have come into existence post modification. The ECU
has to operate on the newly acquired data as this new data reflects the true conditions post modification.
Resetting the ECU when you choose to boost Octane with HHO gas becomes necessary because your
ECU has a memory bank for octane. This means that if you've been using lower octane, the response of ECU
will correspond to lower octane with the booster matching lower octane performance. The ECU response will
continue to correspond to lower octane even though you have started using higher-octane fuel. This is
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