oxygen sensor #2 cylinder

[close2classic]

Well I hooked up my o2 sensor to the upstream spot on my aftermarket header.
That location only reads off the #2 cylinder.
After a 100 mile trip to Kansas City I got 33.5 mpg and my sparkplugs look fine.

Is it really bad to have it in that location reading only one cylinder? I know some people are against it.

[19dabeast85]

Well I hooked up my o2 sensor to the upstream spot on my aftermarket header.
That location only reads off the #2 cylinder.
After a 100 mile trip to Kansas City I got 33.5 mpg and my sparkplugs look fine.

Is it really bad to have it in that location reading only one cylinder? I know some people are against it.

It's probably not the best because the ecu adjusts fuel for that specific cylinder only instead of an average of the 4 cylinders. I also know our intake manifold plenum design slightly starves the #4(I think) cylinder of air causing that cylinder to always be a little different than the others. If I were you, I'd put the sensor back just after the 2->1 collector.

In a perfect world, you'd have an oxygen sensor for each cylinder but that's not practical on a lower-performance engine. I'm thinking about having my future F22 build tuned "per cylinder" if I can find software that has the capability and tuner that can do it, because even the most precise engine builds will run slightly different between cylinders.

[close2classic]

Sounds good... but my PT6 computer is so finicky, its the only way to satisfy it right now. I am even thinking of putting a DX Header on.

[foamypirate]

It's probably not the best because the ecu adjusts fuel for that specific cylinder only instead of an average of the 4 cylinders. I also know our intake manifold plenum design slightly starves the #4(I think) cylinder of air causing that cylinder to always be a little different than the others. If I were you, I'd put the sensor back just after the 2->1 collector.

In a perfect world, you'd have an oxygen sensor for each cylinder but that's not practical on a lower-performance engine. I'm thinking about having my future F22 build tuned "per cylinder" if I can find software that has the capability and tuner that can do it, because even the most precise engine builds will run slightly different between cylinders.

I believe the AEM EMS supports this option. I'm not sure about Hondata, but a quick glance through their website might tell you.

[19dabeast85]

I believe the AEM EMS supports this option. I'm not sure about Hondata, but a quick glance through their website might tell you.

I JUST read through Bisi's 700whp turbo build and I really want the AEM setup that he uses.....and yes evidently it will allow me (meaning a tuner) to tune each cylinder independently.

Also, I must have been confused about #4 running differently than the rest, apparently it's #3 that runs hotter than the other 3 cylinders and needs slightly retarded timing. A single oxygen sensor on the #3 exhaust runner would give you the best engine longevity while sacrificing a little power from the other 3 cylinders.

To the OP:
You may consider visiting an exhaust shop and getting an o2 bung welded to the #3 primary and see if using that location nets any improvements in performance......which BTW, what exactly are the symptoms you're experiencing with the traditional o2 sensor location?

[close2classic]

Ever since I switched from the PT3 to the PT6
I get sporadic code 43. I know thats the fuel system but its obvious its coming from a finicky computer not getting along with the sensor. P12 did the same thing. Tried a new bosch o2, no help. The light comes on as soon as I reach NOT and cruising around 50 mph. I did all the ohm checkouts and voltage readings, also good.

Computer is quiet now with being in the new spot.

What kind of 4 bangers have independent o2 sensors from the factory? Sounds like BMW stuff!

[19dabeast85]

Ever since I switched from the PT3 to the PT6
I get sporadic code 43. I know thats the fuel system but its obvious its coming from a finicky computer not getting along with the sensor. P12 did the same thing. Tried a new bosch o2, no help. The light comes on as soon as I reach NOT and cruising around 50 mph. I did all the ohm checkouts and voltage readings, also good.

Computer is quiet now with being in the new spot.

What kind of 4 bangers have independent o2 sensors from the factory? Sounds like BMW stuff!

Sounds like a possible bad o2 sensor.....Bosch sensors are hit or miss with our Accords, you may want to replace it with an NGK brand sensor. If it was throwing a code when monitoring all 4 cylinders but not while monitoring #2, then you may have a fuel delivery or spark issue with a cylinder other than #2 that's causing the conglomerate reading to throw a code. What condition is your ignition system in? Are you getting good spark to each cylinder? Does your engine have good power? Is idle quality smooth? Unplug each fuel injector one at a time and see if any of them cause engine idle to struggle.

No cars that I know of come with an o2 for each cylinder, I just said in a perfect world that's how they would be.

[close2classic]

power is fine.. 0-60 in about 9 seconds. Which is good because Car and Driver quoted it at 10 seconds when they tested it new in 1990! (I have that issue)
I checked my resistance at the injectors and the box- good.
Maybe need to check fuel pressure just for shits and grins.

Its just amazing that the PT3 computer never threw a code.