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I was hoping that you guy could help me.
I have been run with hho for about a year now.
I have tryed a dual map rester in hopes to to control the map but need constant attachen and on any incline the ecu would not allow it.
I then tryed to a map rester on the maf but again the ecu said no.
I had the o2 sensers rapped in aluman foil in hopes to make ecu think they were to rich but that did not get more mpg.
I then got a Dual EFIE for the o2 sensers but that I had to send it back because did not work right.
I tryed cuting back on the air flow that got in to the air fliter box in hopes to get the ecu to think it need more air but that did not get more mpg.
I also tryed two different ventures that was sappose to help get more hho in to the engine but that did not get more mpg.
I also tryed foulers that pulled out the o2 sensers out about a inch to make the ecu think they were to rich still no more mpg.
I have three 64 oz canning jars with s/s rods and s/s plates with six 1/4 tps of lyie mixed in one gal jugs of dist water.
I use my trip to work as a mpg guide it is a 46.1 mile trip there and back. The first 14.3 miles is half hilly and half flat and is a highway heading north the next 19.4 miles is flat highway heading east the next 12.4 miles is half highway and half city driving and the highway half is flat.
The last coup of days I put back in the torinado with a plastic cuting board rapped around to try to make a k&m mass air flow tube.
I have goting up to 22. mpg but the ecu well not let me keep it that steady.
I know that the ecu is programed to run at 18.6 mpg because the read out on the dash will tell you that.
I have also seen the instant read out for mpg on the dash board say 30. mpg for a while untell the ecu catch on and drops it back down to the low twentys.
When the hho is allowed to work like it is sapposed to the engine runs smooth and quite that it seems as if it is not even on and then the ecu catchs on and back to the twentys.

Thanks for any help.

Uh... perhaps you should understand this to mean that you HHO setup really isn't doing anything for you at all?

I'm going to have to say that this is not so much of an indication of the HHO set up not doing anything but rather that it's more about the ECU fighting those changes. I think it's another case of the mod might work if you could get around the ECU's interference which, for the average person, is nearly impossible. Until you can figure out how to hack the ECU, I would suggest reading up on the driving tips and improving your techniques. Technique is something that the ECU has much less control over.

First, low 20s for that vehicle is pretty darned good (old EPA of 15/18)

Second. Try returning your vehicle to stock condition and read this article:
http://www.cleanmpg.com/forums/showthread.php?t=1510

From the experiences we have had, very few changes to a vehicle actually help FE, and most of them hurt (Mythbusters actually did a show on many of them, and HHO failed miserably). Our biggest results come from how we drive.

A few mods that have been found to help: Warm Air Intake during the winter, blocking the grill and/or radiator (mostly in the winter depending on how hot the weather gets), and aerodynamic mods (the aerocivic being the best example).

You will get a much better improvement from adjusting the way you drive than you would from most mods. I suggest starting here, Beating the EPA - The Why’s and How to Hypermile (http://www.cleanmpg.com/forums/showthread.php?t=1510).

I have also seen the instant read out for mpg on the dash board say 30. mpg for a while untell the ecu catch on and drops it back down to the low twentys.
When the hho is allowed to work like it is sapposed to the engine runs smooth and quite that it seems as if it is not even on and then the ecu catchs on and back to the twentys.

Thanks for any help.

I'm sure your seeing the mileage drop, but I don't think the ECU is doing it. Even if the ECU is doing it, look for the why. The ECU is not going to dump fuel just to lower your mileage, there is a reason.
I would look at other factors.

-Slight change to an uphill grade,
-or your foot moving,
-or you got up to speed backed off mileage jumped up, truck started slowing a bit so you or the ECU started giving it a hair more fuel.
-A gust of wind can also cause a sudden drop in mileage. is there something blocking the wind until the point where you see the drop?


Knowledge is always key, More info would likely help.
-Are RPM’s staying the same?
-Do you have a lock up torque converter? If so is it unlocking or unlocking at the drop?
-Is Engine Load (LOD on ScanGauge) staying the same?
-Is the Throttle Plate opening more? Signaling the engine started pulling more air, likely your foot moved.(TPS on ScanGauge)
-Rate of Fuel Flow would be helpful to see, (ScanGauge or MPGuino can help with that)
-Do you know at what temp the engine starts running efficiently? My ECU doesn’t seem to allow for as efficient running until the engine gets into the upper 130’s(f).

(note: I don't actualy want answers to all those, just pointing out things to look at)


**If you start looking at more of what is going on, I think you will find you can make changes in your driving to keep the Engine running its most efficient.

I'm sure your seeing the mileage drop, but I don't think the ECU is doing it. Even if the ECU is doing it, look for the why. The ECU is not going to dump fuel just to lower your mileage, there is a reason.
I would look at other factors.

The ECU most certainly can affect mileage. When it looks at all of the data from it's sensors, if it sees something that strays too far from what it expects to see, it can choose to ignore/override sensor input. Even with that said, the advice to focus on driving technique will give the most consistent results.

The ECU most certainly can affect mileage. When it looks at all of the data from it's sensors, if it sees something that strays too far from what it expects to see, it can choose to ignore/override sensor input. Even with that said, the advice to focus on driving technique will give the most consistent results.

Correct Larry. The ecu has a few parameters when if breached causes the ecu to ignore the sensor input.

Correct Larry. The ecu has a few parameters when if breached causes the ecu to ignore the sensor input.
This is why I think it's not such a good idea to so quickly summarily dismiss all FE mods as snake oil or that they don't work. Again, modifying the brain and right foot are very effective in increasing mileage but, not all FE mods are ineffective/don't work either.

This is why I think it's not such a good idea to so quickly summarily dismiss all FE mods as snake oil or that they don't work. Again, modifying the brain and right foot are very effective in increasing mileage but, not all FE mods are ineffective/don't work either.

Too true. However one mod at a time is best so you know which ones are working and which ones aren't.

Wow

First off 22 mpg for a 5000 lb automatic transmission truck 4x4 is pretty good.
I have an old 5.7 Suburban 2wd-1998 210,000 miles. I get maybe 15 mpg in city driving as long as I have some city interstate mixed in.
On long trips with the CC set to 68 mph I get 21 mpg( I'm doing lots of sub 68 mph driving thru towns, road work etc).

My point-22 mpg is very good if you are doing much city driving.

You much be doing some hypermiling- pulse and glide maybe 45 psi tires, shut down the motor at long lights??

It is VERY HARD to beat the OEM ECU for mpg. The engineers know what they are doing and they really don't leave much on the plate in respect to leaning out the mixture. I suspect you are wasting your time with the lean out the mixture mods. Now a mod that would get it to think the cat can is warmed up earlier than it actually is will help your city mpg. If you live in a cold place an engine block heater will be good also.

Other mods-tire pressure, and weight loss, and drag loss-they work. Pull out any extra weight-pressure the tires to sidewall max- some folks swear by bed covers-I doubt they are worth the $800 they cost.

You must already be modifying your driving-to get 22 mpg- so you are on the right track. I would probably give up on the trying to make it leaner mods.The OEM guys have that covered already-too lean and you get misfires and the fuel ends up burned by the cat con, not in the combustion chamber.
Congrats on 22 mpg
Charlie