Trick o2 Sensor

[wishturbo]

Hello everyone,

I would like to ask something about o2 sensor. Currently my car was doing bolt-on turbo and everything is fine except Engine Check Light on. Once the CE light on, TRC and VSC system disable which I don't want it happened. I did system diagnosis and it detected as "Fuel too rich" from o2 sensor. FYI, the ecu no longer can control injectors since I'm using standalone ECU.

So, is there any way i can trick ECU from getting signal 'Fuel Too Rich' from o2 sensor? I already did sensor relocation and still no luck. Currently I still find the right voltage to do voltage mod. But seems it will fail :(

 

[davidv00]

questions:

1. who is your tuner?
2. are u using wideband o2 sensor?
3. what standalone ecu currently using?

 

[wishturbo]

questions:

1. who is your tuner?
2. are u using wideband o2 sensor?
3. what standalone ecu currently using?

1. My tuner is Mr Taib/Along from RMD Garage Johor
2. I'm using original Toyota Wish O2 Sensors
3. I'm using Microtech MT4 temporary until the LT10s arrive

So any idea bro?

 

[The_Magician]

just wait until your lt10 arrive ler hehehhe

 

[wishturbo]

Haiyak.. ok la bro if you are suggesting that one haha

 

[jinkl]

u r using mt4 which means its a piggyback
once u use a lt10s , those errors will go away
and i dont tink so lt10s will be making use of those o2 sensors anymroe

 

[wishturbo]

Yes you are right. Currently my setup not using O2 sensor anymore. MT4 using MAP to calculate A/F ratio. We place the O2 sensors because stock ECU still need it.

Currently I'm using MT4 to control larger injectors completely. So its a standalone rite? Stock injectors and ecu wiring still there but I'm hiding it. It's to prevent CE light to on.

Let me explain the situation.

1. Stock ECU still control the original injectors but it's just for dummy
2. MT4 connected directly to the new injectors (550cc), so basically no stock ECU involved here
3. Can u explain how LT10s will get rid of problem where O2 sensors detecting high fuel ratio? The stock ECU still there to control gearbox and few electronic stuffs even I'm using LT10s. So it still detecting the fuel-too-rich and turn on CE light.
4. The only way is to cheat ECU from getting fuel too rich signal from both O2 sensors. Maybe voltage mode?

 

[jinkl]

Yes you are right. Currently my setup not using O2 sensor anymore. MT4 using MAP to calculate A/F ratio. We place the O2 sensors because stock ECU still need it.

Currently I'm using MT4 to control larger injectors completely. So its a standalone rite? Stock injectors and ecu wiring still there but I'm hiding it. It's to prevent CE light to on.

Let me explain the situation.

1. Stock ECU still control the original injectors but it's just for dummy
2. MT4 connected directly to the new injectors (550cc), so basically no stock ECU involved here
3. Can u explain how LT10s will get rid of problem where O2 sensors detecting high fuel ratio? The stock ECU still there to control gearbox and few electronic stuffs even I'm using LT10s. So it still detecting the fuel-too-rich and turn on CE light.
4. The only way is to cheat ECU from getting fuel too rich signal from both O2 sensors. Maybe voltage mode?

nop, tht makes ur mt4 a piggyback :)
i guess ur ignition is still controlled by ur stock ecu

 

[wishturbo]

nop, tht makes ur mt4 a piggyback :)
i guess ur ignition is still controlled by ur stock ecu

Your absolutely rite. Nvm la piggyback or standalone dont care.. so you have idea bro how to trick this O2 sensors? Let's say I'm using LT10s now, its still detecting fuel too rich rite? Because the stock ECU still there... If i not mistaken LT10s control injectors and ignition.

The reason why stock ECU is there when LT10s installed is to control e-throttle and gearbox. Few electronic stuffs like VSC and Traction Control if I not mistaken. So,,

1. A/F Ratio not same as N/A. Maybe around 9:1 not 14.7:1 anymore.
2. Detected by O2 sensors as fuel too rich
3. Stock ECU try to adjust stock injectors that we place for dummy
4. Same result, O2 sensors still detect fuel too rich. For sure nothing happened, injectors controlled by microtech now
5. Engine CE turn on
6. VSC and TRC disable
7. Owned lol

How ar?

 

[jinkl]

Your absolutely rite. Nvm la piggyback or standalone dont care.. so you have idea bro how to trick this O2 sensors? Let's say I'm using LT10s now, its still detecting fuel too rich rite? Because the stock ECU still there... If i not mistaken LT10s control injectors and ignition.

The reason why stock ECU is there when LT10s installed is to control e-throttle and gearbox. Few electronic stuffs like VSC and Traction Control if I not mistaken. So,,

1. A/F Ratio not same as N/A. Maybe around 9:1 not 14.7:1 anymore.
2. Detected by O2 sensors as fuel too rich
3. Stock ECU try to adjust stock injectors that we place for dummy
4. Same result, O2 sensors still detect fuel too rich. For sure nothing happened, injectors controlled by microtech now
5. Engine CE turn on
6. VSC and TRC disable
7. Owned lol

How ar?

errr , if u r using a MT4 , why dont u tune it to let the AFR be 14.7 instead ?

 

[wishturbo]

Huh? NA A/F cant be same as turbo A/F bro. For sure when boost kick in, the fuel is not enough. Beside that, running turbo with NA A/F will cause heavily damage to engine

That's why i said MT4 is not running as piggyback. The injector output for MT4 connected directly to 4 evo injectors. The stock injector place outside the engine and its working without fuel rail (so no fuel will be spray out) and it's connected to stock ECU..

So, basically is,, all system running as stock except larger injectors had been replace and controlled by MT4. The stock injector placed outside the engine (if we cut the stock injectors cable, CE light will on)

Later when LT10s installed, we need to put the original coil outside the engine head too. New coil will be use and it connected to LT10s. So, i will have 8 injectors and 8 coil in my engine bay. Just to prevent engine CE from turning on

 

[jinkl]

wops, forgot u r on bolt on turbo
another way is to alter the signal of the A/F Sensor , erm , how many wires does ur sensor have ?

 

[wishturbo]

wops, forgot u r on bolt on turbo
another way is to alter the signal of the A/F Sensor , erm , how many wires does ur sensor have ?

wah.. so long we discuss now only u realize i am bot my wish

Hurm.. if not mistaken 4..

 

[jinkl]

http://www.kemparts.com/TechTalk/tt07.asp
this should work

 

[wishturbo]

http://www.kemparts.com/TechTalk/tt07.asp
this should work

Thank you bro, I will read through and do it tomorrow

Edit :- I need better wiring diagram to do the voltage mod. No info about it yet