EFIE + O2 sensor

[yanlapanic]

Hi ,
pre-cat O2 sensor have 4 wires ... after the connector , when the cable are running to the ECU , theire colors are : Pink , Black, Brown and White.

Which one is the Signal wire ?

Ps: it is for a project .... HHO injection project.

[fishexpo101]

If you pop in that EFIE - it will almost guarantee a CEL. Be very careful when leaning out the mix - I would highly suggest you invest in a wideband O2 sensor and monitor the actual air/fuel mix before you just blindly leaning it out.

The 1ZZ-FE runs quite lean at cruise speeds as is - coupled with a taper-squish combustion chamber/piston design - this is quite literally a recipe for engine damage, or at the very least burned valve - regardless of the supplementary fuel sourced used.

As for your query - Not positive on the ECM side colors, but from the O2 sensor side - Blue (+ signal), White (- signal), Black and Black (heater circuit).

[yanlapanic]

Originally Posted by fishexpo101

If you pop in that EFIE - it will almost guarantee a CEL. Be very careful when leaning out the mix - I would highly suggest you invest in a wideband O2 sensor and monitor the actual air/fuel mix before you just blindly leaning it out.

The 1ZZ-FE runs quite lean at cruise speeds as is - coupled with a taper-squish combustion chamber/piston design - this is quite literally a recipe for engine damage, or at the very least burned valve - regardless of the supplementary fuel sourced used.

As for your query - Not positive on the ECM side colors, but from the O2 sensor side - Blue (+ signal), White (- signal), Black and Black (heater circuit).

maybe I should finaly buy a Volo chip which can handle HHo injection .
I Just have to plug it on the OBD port and that's it .

The gadget im talking about is the ''volo fs-2 ''


cause buying a EFIE + A/F monitor start to be expensive .

edit : what is a CEL ?

[fishexpo101]

CEL = Check Engine Light/Lamp

Many cases, a CEL will set the ECM into a "safe" mode - depending on the CEL, the ECM will completely ignore certain sensors that influence its feedback circuitry. Usually, this means the car will run an excessively "rich" air fuel mix.

As for the Velo - I haven't seen one personally, so I can't comment one way or another. But it looks like another version of a signal interceptor - tricking the ECM into "seeing" different values. A "soft" air/fuel and possibly timing map so to speak. Claims on their website are a little hard to believe - if you understand how the ECM on the Toyota works. May work for other cars, not 100% positive this will work as well on a Toyota - as the ECM is not user flashable, like other manufacturers.

Personally, I'd go wideband and a programmable piggyback EMS (engine management system) - there you have nearly infinite control of the parameters you are most interested and can see in real-time how those are affecting operation. At a very minimum - I'd run a Scangauge with any modification. One, it will monitor in real-time some critical parameters, two - it will reset the ECM if you get a CEL, three - acts as a trip computer - you'd be surprised how much fuel you'll save by changing your driving style. Brand new Scangauges run around $170 or so - give that this acts like an OBD-II scanner, most of those with real-time display capability running over $100 - makes it a pretty decent deal.

[yanlapanic]

Originally Posted by fishexpo101

CEL = Check Engine Light/Lamp


Personally, I'd go wideband and a programmable piggyback EMS (engine management system) - there you have nearly infinite control of the parameters you are most interested and can see in real-time how those are affecting operation. At a very minimum - I'd run a Scangauge with any modification. One, it will monitor in real-time some critical parameters, two - it will reset the ECM if you get a CEL, three - acts as a trip computer - you'd be surprised how much fuel you'll save by changing your driving style. Brand new Scangauges run around $170 or so - give that this acts like an OBD-II scanner, most of those with real-time display capability running over $100 - makes it a pretty decent deal.

I cannot really afford this type of thing . I'm a student and I work like only the week-end . For the scan gauge It's a nice instrument I would like to have but for the moment I want to concentrate on My HHO Project .

I don't think I can hurt my engine going mixture of 16:1 for example .ONly 2 stroke are really affected by A/f .
ANd I don't think I will ''lean '' it a lot , I juste want to compensate for the Oxygen injected on the intake .

[yanlapanic]

Originally Posted by fishexpo101

CEL = Check Engine Light/Lamp


As for the Velo - I haven't seen one personally, so I can't comment one way or another. But it looks like another version of a signal interceptor - tricking the ECM into "seeing" different values. A "soft" air/fuel and possibly timing map so to speak. Claims on their website are a little hard to believe - if you understand how the ECM on the Toyota works. May work for other cars, not 100% positive this will work as well on a Toyota - as the ECM is not user flashable, like other manufacturers.

personnaly I read a lot of feedback about volo chip and it seem good ..

Anyways they will refund me if It dont work on my toyota ... are you sure that It could never work on my car or it juste a guess?

[Milky]

Originally Posted by yanlapanic

I cannot really afford this type of thing . I'm a student and I work like only the week-end . For the scan gauge It's a nice instrument I would like to have but for the moment I want to concentrate on My HHO Project .

I don't think I can hurt my engine going mixture of 16:1 for example .ONly 2 stroke are really affected by A/f .
ANd I don't think I will ''lean '' it a lot , I juste want to compensate for the Oxygen injected on the intake .

your engine is already running an air to fuel ratio close to 16:1 when cruising. this is not a big issue, alot of naturally aspirated vehicles do this to improve gas mileage. now if your talking 16:1 afr (air to fuel ratio) while under wide open throttle, or even part throttle acceleration, i will guarentee you will have mild to severe detonation. the engine will not last long at all.

all engines are affected by arf's. period. the fuel does more than just act as a catalyst for air to burn. it can also provide a cooling effect to the piston and combustion chamber to keep hot spots from popping up. most vehicle manufacturers tune for this as well. it does not affect the mpg as much as one would think. on average a naturally aspirated engine just needs .1-.2 increase in afr's to achieve this cooling effect. if you lean your engine out and take out this cushion, you will have problems.

[yanlapanic]

Originally Posted by Milky

your engine is already running an air to fuel ratio close to 16:1 when cruising. this is not a big issue, alot of naturally aspirated vehicles do this to improve gas mileage. now if your talking 16:1 afr (air to fuel ratio) while under wide open throttle, or even part throttle acceleration, i will guarentee you will have mild to severe detonation. the engine will not last long at all.

all engines are affected by arf's. period. the fuel does more than just act as a catalyst for air to burn. it can also provide a cooling effect to the piston and combustion chamber to keep hot spots from popping up. most vehicle manufacturers tune for this as well. it does not affect the mpg as much as one would think. on average a naturally aspirated engine just needs .1-.2 increase in afr's to achieve this cooling effect. if you lean your engine out and take out this cushion, you will have problems.

Ok nice , I'll think about it

[UFOpilot]

I understand the caution here with leaning out the fuel/air mix past spec. My experience is the nature of how the hydrogen/oxygen combine with the gasoline make a more efficient and complete combustion and that exhaust gas temp actually goes down.
My engine runs much happier with HHO: more power (seemingly as I haven't dyno'd the Highlander), smoother running and definitely better MPG.