I read that if you splice your second 02 sensor into your first one that 2 cylinders would run lean and 2 run rich. My b16a doesnt seem as fast as it should, and i spiced the wires so i was wondering what other ways do people put the second 02 on? and Is this about the sensor true?

Vtec - How do you know for sure that the vtec actually works properly? I mean it feels quicker in the higher rpms, but im not sure
chris

 

Search on the O2 you have to add a bung, you'll hear VTEC kick in on the B16,

aaaaaaaaaaaaaaaaaaaaaaaAAAAAAAAAAAAAAAAAAAAAAHHHHH HHH

 

by about 6000 rpm, if the motor doesn't feel like it's going anywhere, then vtec is not working. but yeah, like he ^^ said, where the capital letters start, it will get louder, whoopty holler

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88whitehf &raquo;</TD></TR><TR><TD CLASS="quote">I read that if you splice your second 02 sensor into your first one that 2 cylinders would run lean and 2 run rich. My b16a doesnt seem as fast as it should, and i spiced the wires so i was wondering what other ways do people put the second 02 on? and Is this about the sensor true?

Vtec - How do you know for sure that the vtec actually works properly? I mean it feels quicker in the higher rpms, but im not sure
chris</TD></TR></TABLE>

Hey 88whitehf, I'm not sure about the rich and lean thing, but why did you splice them together? Are you running an aftermarket header?

 

I have a pr3 ECU and got it reprogrammed to run only 1 o2 sensor. you have to make your own bung in the header. its not hard just find a nut that fits your o2 sensor and weld it on then drill it out. make sure you put it the right place. like said above search it, a post describes it real well and has pictures too

 

actually both o2 sensors have to be in the exact location as they where on the original header, one o2 sensor reads cylinder 1 and 3 the other o2 sensor reads cylinder 2 and 4, if you are splicing the wires the ecu isnt getting the right signal, it will get half the information for each cylinder causing 2 cylinders to be 50% leaner than they should be and the other 2 cylinders to be 50% richer than they should be.

my b16a is slow as **** and i have determined that this is the reason, i talked to my muffler guy and he told me there isnt anyway to add the o2 bungs in the original spots on my header so im going to have to change to an ecu with only one o2, as far as i know the only setup like that ist he mugen ecu from hyperduck tuning, or the zdyne 1 wire.

this is how i came up with what i wrote above.

Poor running at partial throttle, which the engine 'missing' and feeling 'flat'. If the throttle is opened to 25% or more the engine will run much better, but still may be down in power at full throttle. Diagnosis Unplug both oxygen sensors, and reset the ECU by removing the power in order to clear the long term closed loop mixture adjustments. The ECU will show an oxygen sensor error code but the engine should run much better. With the PW0/PR3 ECUs there are two oxygen sensors. A common problem is to wire one oxygen sensor into both pins in the ECU, or reverse the wiring of the primary and secondary oxygen sensors. In both cases the car will run badly under light throttle until sufficient load is placed on the engine for it to run out of closed loop. The ECU uses each oxygen sensor to tune the mixture in one pair of cylinders. Normally the ECU will slowly lean the mixture for one cylinder pair, and look for the oxygen sensor showing the mixture going lean. Once this happens the ECU will start to enrichen the mixture until the oxygen sensor shows a rich mixture. The effect of this is to swing the mixture over a narrow range close to stoichiometric, typically lambda 0.98 to 1.02, which keeps the mixture close to the ideal range for the catalytic converter. The ECU will tune each cylinder pair independantly of each other. If the oxygen sensor wires are swapped around then the ECU will still try to see a response from each cylinder pair. The ECU will start to lean out one cylinder pair, but will look at the oxygen sensor for the other cylinder pair, so will keep leaning the mixture out. The ECU will see that the other cylinder pair is lean, so will enrichen the mixture for that cylinder pair. The effect usually is that the ECU will run one cylinder pair about 20% lean, and the other 20% rich. The result is that the engine will run flat, without much response and may miss badly. A lambda sensor placed in the exhaust after the secondary pipes join will show that the mixture is roughly correct. Once the load on the engine is increased to a point where the ECU will stop running in closed loop then the engine will run much better, but will still run one cylinder pair lean and the other rich thanks to the long term closed loop adjustment. Wiring one oxygen sensor into the two ECU pins will produce a similar problem, except the ECU will alternate between running each cylinder pair rich and lean. Correcting the problem If the oxygen sensors are wired into the wrong pins in the ECU the solution is to swap the wires around. On JDM cars the oxygen sensor plugs are different to prevent the sensors from being inadvertently swapped. If one oxygen sensor is wired into both ECU pins, then another oxygen sensor must be added, or the ECU updated so that it runs only in open loop (Hondata ROMs can be made to do this). If another oxygen sensor is added then it is important that each oxygen sensor only sees exhaust gas from one cylinder pair.

 

that is a great write up!

 

I had my 02's backwards for the first few months after my swap, and wow what a difference now. It halls major *** now!!! Everyone please check your 02's. I am also getting like 25 mpg just in city driving now, thats the same as my d16a6. I have a dc header with the 02's welded into factory locations, I highly recomend this to everyone. It costs a few extra bux, but definately worth it. As stated above. Ryan

 

Before i did my swap someone told me where to add the wires to the ecu pins and he said just tap your second 02 through your first one so i did and didnt think anything of it becuase it runs good but just not as quick as i think it should. So if someone could show me where i can find some info regarding where the O2 sensors should go into my ecu my car would greatly appreciate it. thanks
chris

 

look in my sig, there is a swap guide with wiring info, it will show u what pins are for the o2 sensors, if your using the stock header, with the 2 o2 sensors than hook them up and let me know what happens, before i throw down some cash on a new ecu.