Resetting ECU?

[HHO??]

I saw a youtube video on resetting your ECU and I have a question...

How would resetting the ECU help after installing an HHO assist system if the O sensor is still going to sense the O in the HHO and adjust accordingly? Shouldn't the O sensor be unplugged before the reset?

[marchlabs]

if everything is tuned in right you wont need to reset the ECU.. if during tuning of the HHo system you trigger the check engine light , your ecu will be in default mode giving you crappy milleage.. I keep forgetting .. i thinks its open lop and you want to be in closed loop. ~ no check engine light.

you need to use a good EFIE and MAP enhancer..

Jeremy
www.hybridconversions.com
www.marchlabs.com

[dataman19]

Resetting your ECU?
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The only time you have to reset your ECU is when you have a class I failure that holds an error code in the ECU. These failures are the ones the Emissions Control Testing Station looks for when they plug in to the OBDII port at the inspection station. Resetting the ECU effectively clears the Error Code History.
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Just fixing the problem and having the light go out does not remove the error code from the ECU. Change the battery - the Error Code for Battery failure is there. O2 sensor go bad - there is an error code saved for that as well (incidentally, if this error code shows up in the vehicle history log at the inspection station. They will hook the car up to the exhaust emissions analyzer to verify that the emissions are in fact corrected).
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However - the ECU has an engine map.. it also has an O2 Map table that determines the amount of O2 exiting the engine. This is used to determine lean/rich fuel conditions and set the fuel/air mixture. When the O2 sensor reports a certain value in parts per million, the engine ECU looks this value up in the O2 Table, and applies the corresponding figure to the Fuel/Air Mixture table index. There it is compared with the Engine RPM Index, and the Mass Air Sensor Data Table Index. Then the fuel pressure and Fuel Injector Cycles are adjusted to bring the fuel/air mixture into the desired normal range. then the O2 sensor data is verified, and appropriate adjustments made again (This is a continuous process, as long as the engine is running).
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HHO upsets the O2 standard, some people modify the O2 sensor to make the engine think it is running too lean (meaning the O2 drops). This is because Hydrogen burn will consume more of the O2, hence the O2 sensor readings will indicate a lean fuel/air and cause the fuel ratio to increase. This counters the effects of running Hydroxy and is why many people see little or no mileage increase.
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Modifying the O2 Engine Map Table would allow you to run the engine leaner, but then would potentially raise the nitrates in the exhaust (The EPA Frowns upon this).
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But, modifying the Engine O2 Map Table to include a Table for HHO would allow you to benefit from hydroxy injection without the ECU off setting the mileage gain.
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The problem lies in laying out the tables to coincide with the amount (ratio) of hydroxy gas insertion. This is not a easy task - it is not illegal, but then it isn;t legal either. There is a little EPA Mandate and Federal Law that makes it "illegal to tamper with Engine Emissions Controls". While this law was clearly aimed at people who defeated and invalidated emissions control in the 70's - causing the increased harmful emission- It was never intended to apply to people who were actually lessening the emissions. But legislative action being the way it is, and our Congress' need to line their pockets with contributions from the many interested commercial entities - our laws never turn out for the better (unless you are the industry that benefits from the legislative action directly - which is why lobbyist can affort give out so many hand outs).
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The engine Map Tables are registered with the EPA. Getting an alternate engine map registered and approved is a long and expensive process. The EPA and government do not certify based upon scientific fact, they do so upon associate industry approval (in our case, a. The Congress and Senate, b. The Oil Companies, c. The car Manufacturers, d. The National Association of Automotive Engineers, e. Independent testing labs, f. consumer special interest groups, g. lobbyist). So in order for this to happen - the Congress has to be convinced that it is good. And in order for the Congress to be convinced that it is good - they need Cash, and a lot of cash.
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dataman19