Wiring L92 with O2 sensors

[68problemchild]

Newbie here so forgive the basic question.

I purchased EFI live, and a separate LC-1 02 sensor. Putting in the new harness, it also has two plugs for O2 sensors.

I am putting the harness in over the next two weeks from Current performance.

Do I plug the O2 sensors into my new harness or keep it separate? If the harness, I need another sensor, one for each header yes?

thanks so much.

[Taz]

Hello,

You have an L92 6.2L GenIV ?? In OEM form you'll have an ECM (PCM) and TCM, and the wiring harness. In OEM form you need 4 O2 sensors - one pre & post cat in each bank. If you have a custom tune, with the rear O2 sensors disabled (they only measure cat performance for emissions purposes), then you require an O2 sensor in each bank - between the engine and the cat. OEM O2 sensors are "narrow" band - these monitor the AFR when in closed loop, and relay this information to the ECM (PCM), which may "trim" fuel as is necessary.

The LC-1 O2 sensor you mentioned - is that a wide band O2 (for use with AFR measuring equipment) ?? If so, it is not compatible for use in providing feedback to the ECM (PCM).


Regards,
Taz

[joecar]

The LC-1 is a wideband oxygen (WBO) sensor for measuring lambda for tuning purposes.

The GM ECM uses narrowband oxygen (NBO) sensors to trim the AFR (closed loop feedback).

The LC-1 is able to emulate NBO sensors; it has 2 outputs:
- WB signal, used by tuning/logging tools (like EFILive);
- NB signal, used by the ECM to trim the AFR.

So, you could have 2x LC-1's if you wanted to spend $200 each... it's cheaper to use NBO sensors and have just one LC-1.

[68problemchild]

Yes, I already have the $200 LC-1. Engine is not stock/custom tune, L-92 6.2 gen IV with VVT and custom cam. Can you recommend a single sensor NBO? Should it match the brand of the LC-1 or doesn't it matter? Should it match the stock ones used precat? No cats here obviously.

Thanks so much for the help.

[Taz]

The most cost effective option is the use of OEM type NBO in each bank. That leaves your LC-1 available for tuning use, for this vehicle, or any other vehicle you may wish to tune. You can usually purchase the required NBO at NAPA, Autozone, etc. - doesn't have to be from GM. Check out www.gmpartsdirect.com they often have very competitive prices.

Regards,
Taz

[68problemchild]

The LC-1 will be dedicated to this vehicle.

The plug from the car is two black, white and a blue.

Wires from the LC-1 are :
Black
Red
Blue
White
Yellow
Brown

Anyone know which goes to which?

Then I assume some portion plugs into the EFI Live V2 Flash scan?

Thanks so much for the help here.

PS, I bought and installed a bosch unit for the drivers side today so that side is covered.

[joecar]

Vehicle is what/year/model... (I need that to look up the wiring diagrams).

[68problemchild]

The engine is originally from a 2007 Cadillac escalade. 6.2 Liter aluminum V8.

[joecar]

The engine is originally from a 2007 Cadillac escalade. 6.2 Liter aluminum V8.

This is what your harness is...?

[68problemchild]

Harness is from current performance. Hooker headers came with 02 extensions. Two black, one white, one blue which line up with the harness wires. Only one way to put the plug in.

Harness 4 wires are black/white stripe, red, brown/white stripe, and purple/white stripe. However not sure if current performance matched original L92 colors.

The driver side hooked up as follows:


Current perf harness = Hooker o2 extension = Bosch sensor

Black white stripe = black = White
Red = black = white
Brown white stripe = white = grey
Purple white = blue = black




Thanks!!