o2 sensor wires

[stacka]

I am about to install a HHO system but i have hit a small snag. I dont have an 02 sensor on the vehicle and i am told it didnt actually come out with one from the factory however i have found the wire harness and plug that an 02 sensor can be connected to. It has a plastic blank cap on the end and once i removed this cap i do get volt readings.
My question is: If i connect my EFIE to the sender wire will i be able to lean out the fuel mixture once the EFIE is connected and would the ECM read the signal from this wire considering the o2 sensor more than likely was not on the car from the factory but the connection harness and plug was ?
My vehicle is a 1996  80 series Landcruiser, 4500 ltr Petrol, Auto.
Oh and i am in Australia.

[PDJ]

Hi Stacka,

Welcome to the Forum

Looks like your Land Cruiser does not need an EFIE.

You say it does not have an O2 sensor, but from what you describe the vehicle would have had an option to have an EFI system installed when it was being made.

I would say that you do not have an Electronic Fuel Injection system, but have a carby. This being the case you do not need an EFIE, it will serve you no benefit and even if you did install one, you would not have a place to connect it to.

If you do have a fuel management computer and no O2 sensor (early version) there is no reason to connect the EFIE. They simply change the voltage output from the O2 sensor so your fuel management computer does not get the wrong signal from your O2 sensor.

Does your vehicle have a carby?

[stacka]

Probably should have stated that origonally hey, Yes the vehicle is fuel injected, so it does not have a carby.
Speaking to a few machanics i know, they all say they didnt have the actual sensor on them when they came out from the factory so i gather my model purely runs by the preset factory setting in the ECM. The guy that renewed my exaust system also said it did not have the actual sensor in it but varified the wire i pointed out to him was or looked like where the sensor could plug into and he thinks maybe if i did put a sensor on and connected it, the ECM might not read it.

[PDJ]

An EFIE allows you to bypass different voltage settings omitted from your O2 sensor that are fed to your ECM. With no O2 sensor there is no variation to the fuel / air mix.

If you did have an O2 sensor and ran HHO you would have increased O2 in your exhaust - The O2 sensor would see this and alter the voltage to your fuel management computer to rich up the fuel/air mix.

You don't have O2 sensors, your comp runs on factory presets and there is no reason to use an EFIE.

The voltage you found in your wiring harness is the feed for an O2 sensor. Your car would have a standard wiring harness, just not connected to things that are not there (one end to the O2 and the other end to your ecm.

I know for a fact that if you had a car with an O2 sensor and for some reason it broke, you would have a rich fuel default and terrible economy.

I think this will be pretty right, if anyone else has a different opinion please post a response.

[stacka]

I understand all that pretty plainly and i am pretty sure you are correct in what you are saying, but my question would be, if i conected my HHO system up and not use a EFIE and no way of adjusting the fuel mixture wouldnt Adding the HHo system have an adverse affect on fuel economy ?

[JohnBaxter]

I thought that at first. What you are doing is introducing a way for ALL the fuel to be burned in the cylinder. The result is more power and less fuel used because the extra power still lets you get from point A to B.

From what I read the Hydrogen helps you to burn more or all of the fuel poured into the cylinder. More hydrogen, more complete fuelburn and you simply do not put your foot on the accelerator as much saving fuel cost (and controlling the amount of fuel you pour into the cylinder).

I believe the hydrogen burns faster than petrol and makes more of the fuel burn in the cylinder. This stops the fuel continuing to burn as it enters your exhaust system. There is a place somewhere in this forum I read about exhaust emissions and the unburned hydrocarbons previously in the exhaust are nearly eliminated.

I had a reverse economy when I hooked up my HHO and this was only because I needed an EFIE to change the voltage produced by my O2 sensor. You don't have a sensor and a fuel computer that relies on a changing voltage from your O2 sensor so an efie will not do anything in your engine.

[stacka]

mmmm yes i know and understand all that but like i said before, i do still have an onboard computer. sounds like a tricky or unfamiliar situation from everyone i speak to specially here in OZ as most people and even Mechanics have never even head of HHO or browns gas.
I have 2 HHO producers i have built and running really really well now pumping out a good flow of HHO and staying cool even without using a PWM, all from trial and error mostly so i think the best way would be to connect it all up and just see how it goes i suppose. I will report back here with my results as soon as i have them in the vehicles.
Thanks to you guys that took the time to read and respond to my posting also by the way, much appreciated and anyone else that would like to toss in there advice in the future would be good also.

Paul