A possible way around the ECU problems.

[singnpreacher]

Get a good HHO system you like, one that you want to keep.

Go to a tuning shop, get a new chip and have them dial it in with their computers.

Or get really good EFIEs and MAP & MAF sensor adjustors.

If you have a MAF sensor enhancer, do you also need an EFIE?

[HION]

Anyone have or know anyone who has one of the smart chips from VOLO? Here is the link:
http://www.voloperformance.com/fuelsaver.html

[HiTechRedNeck73]

I think folks are misunderstanding the location and purpose of the o2 sensor. The o2 sensor is located in the exhaust pipe. It senses the amount of o2 left in the exhaust by comparing it with the o2 level in the outside air. The ECM will add or lean the mixture depending on the amount of o2 in the exhaust to achieve a stoich reaction. This is called short-term and long-term fuel trim.

actually it's only the latest generation 5-wire o2 sensors that use the outside air... all other prior generations have a container of air inside the unit to compared to...

here is the thread I did about the way o2 sensors work... got all the info from the manufacturer...

http://www.hhoforums.com/showthread.php?t=1428