Fuel Injected EFI Cars using HHO Part 2

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Others promote installation of an adaptor that will recess the oxygen sensor to make the readings less lean than what the CPU would normally receive. Be advised that it's still possible that these modifications will not correct the problem if the vehicle continues to have long periods of idling with the HHO running. If a switch were installed onto the throttle disabling the HHO during periods when the throttle is at idle position, or if the driver were to switch off the unit manually during engine idle periods, mileage figures will probably be improved. It's best to not have the HHO running on EFI vehicles during engine idle otherwise mileage will be negatively affected.

Another potential problem with EFI vehicles concerns how the HHO is brought into the engine's intake. If the HHO is vented into the engine via of a vacuum line, especially a vacuum line that is vented to open air, a very lean condition will be recorded at engine idle. This condition not only will affect the fuel delivery information by the CPU, but could be severe enough for the "Check Engine" light to come on. If HHO is delivered through a vacuum line care must be taken to make sure there are no vacuum leaks, otherwise turning the HHO unit off via of a switch will not correct problems with poor fuel mileage.

If HHO is delivered via of the intake such as the air cleaner or air cleaner housing, then there should be no problems that would cause the "Check Engine" light to come on. However, the HHO still would need to be switched off during idle to prevent other factors from causing the oxygen sensors to send bad information to the CPU. Properly installed the HHO should work as well on EFI vehicles as on carbureted vehicles. This is probably the reason so many EFI vehicle owners complain of poor mileage using HHO while yet others brag about great mileage improvements. You just have to watch the details on EFI cars so the CPU isn't fooled into increasing fuel delivery.

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