unplugging 02 sensors?

[Helz_McFugly]

If you dont care about your check engine light being on is it all the same to just unplug your 02 sensors?

[spicerman]

If you read the post by Painless about computer integration,(on the main board),He has a link to an article that says that if your o2 sensor is out of range (or unplugged????) that the ECU uses a preset value that would give the engine a 14.7:1 ratio or maybe let it run on the rich side. The author of this article says that you should disconnect the o2 sensor and use fixed resistors to set the o2 signal to the computer. Thereby leaning the fuel ratio to that sweetspot that you are trying to tune to. But first you have to know what that preset value is and calculate what resistors you need. If the engine will run "unplugged" go for it!! There must be some kind of backup system to keep it running if that happens out on the road. I started my truck with the MAF unplugged and it ran fine

[Helz_McFugly]

yea mine are unplugged. I reset the ECM and it runs fine. Ill be testing the MPG's on tomorrows trip to work and back. Ive bypassed the MAF with a resistor. I would think the only thing left to trick would be the MAP.

[Helz_McFugly]

well I ran 100 miles today in 08 charger v6 with the 02's unplugged and resister in place of the mass air flow sensor and yielded 19mpg. back to where i started. Im thinking about buying an older car. maybe a 1980 Chevy p/u with a V6. Im not in the know enough to battle this 2008 ECM....YET!!

[spicerman]

Couldnt you connect a volt meter to the o2 sensor and use it to see how much your hho output is effecting the engine. hook up the your meter across the sensor ground and signal wires of the sensor. You might be able to see the hho effect by a Higher Milivolt reading ???? Take a reading, then turn on the HHO and see how much it changes. that way you will see how much its effecting the engine. How much gas does your cell generate? Do you have a narrow band sensor? If you could get a MV reading with it unplugged you will know where the ECU runs in the "limp mode"

[Helz_McFugly]

yea its a narrow band. it runs at .45 mv when idelling with no HHO on. when i kick on the HHO while its making about 1 LPM the 02 shows a mv drop to .25 to .15. I think that means its telling the ECM its running lean and dumpin more gas in. but why would it do that if they were unplugged? shouldnt it just see them as faulty and run a 14.7:1 fuel to air ratio? Ive got so many sensors on my intake manifold its crazy. I know the MAF sensor and the MAP but the other 3 that are on the air intake manifold have to be doing something to make it dump all that fuel in. ive heard of the BAR sensor. I guess i need to get a OEM book from dodge to find out what they are and what MV's range the run at and build tunable resistors for each one. or et an old beater of a car (1985 chevy P/U) that has no ECM. good oll carb and points.

[spicerman]

Hey!...
Are you getting these readings from the sensor leads?? unplugged? across the leads?? I think low MV's mean high oxygen Witch shows that your HHo out put is having an effect. the EFIE(when hooked up) pushes the o2 sensor signal to the rich side (higher) so the ECU will cut back the fuel. So your ECU is not dumping more fuel, its only trying to maintain the fuel ratio that represents the .45Mv. And your HHO output is pushing it down to the low Mvs you are seeing. If you knew the exhaust temp. you could monitor it as you adjusted the fuel ratio lower. That would give place to the hho in the fuel mix. be careful not to burn a valve. I don't really know when that would happen but if you knew what temp. is supposed to be, and stayed within the OEM Manual values you should be ok.
I read one post under 'General discussion" The dude unplugged the o2 sensors and adjusted the fuel ratio down with a 50k pot on the MAP sensor. He was using a scan guage to set the fuel ratio. He said he was happy the way it was working, Check that out. be careful

[Helz_McFugly]

yea, Im not using any type of EFIE right now. im trying to get the best one for my car and its hard to sift through all the bull s#@t trying to find one. Ill get a dual 02 efie first, I dont think i need a quad. then ill tackle the MAP and MAF sensors. and if that still doesnt work ill start looking at my other sensors to see what they are doing. any suggestions would be great.

[Helz_McFugly]

im thinking about this for my 02 sensors.
http://tinylink.co.za/83463d

[spicerman]

Hey .
Why would you buy an EFIE when you have your sensors unplugged??? Unless you want to put them back in the game. When you have the sensors unplugged its like having a carburetor installed. and its adjusted to give you a 14.7:1 fuel ratio (.45 Mv your seeing) Your ECU will always try to give you that ratio except when you need more power, Then it uses other sensor inputs Like throttle position (TPS), Mass air flow,(MAF) manifold pressure (MAP) and uses library tables programed into the ECU to calculate the fuel "on time" I would think that your $60 bucks would be better spent buying an OEM manual for your vehicle. Then you could find out your exhaust temp. limits and you can also find the other sensor values the computer uses and calculate the resistor you need to adjust that sensor down.(start with the MAP)

Go to the main board and see the thread on computer integration. There is a link there to a text document : OEM computer.txt Check it out before you buy an EFIE.

I have an EFIE installed on my 97 350 chev. Its the poor mans version. I can only turn it up a little or it will set of the check engine light. So EFIE's can be trouble too. dont be too quick to spend your money.

Ive been playing with water/steam injection and I've gained 2 mpg. with no changes to the system at all. I started with 10% of fuel volume and increasing from there. As long as I can see a gain I'll keep adding. But there too you need some way to cut back the fuel in order to see the gains of the HHO & water