O2 sensor question

TransformedBG · Post by **TransformedBG** » Fri Oct 13, 2006 10:09 am

Okay i know that there are already posts about this, but im trying to do some street tunning but i just realized that when i started my car and hooked up the laptop that my lambda was reading 10.70. I let the car warm up and drove around a bit, still 10.70. Im not throwing any cells, but ive disabled OBD II codes so i probably wont right? Anyways im going out on whim and saying one of my o2 sensors are gone? Or could that be something else? I mean i have probably been running rich cause i tuned my car for 91 oct in cali moved to texas and now im running 93. and the other day i had to pull off my 2" mid pipe cause i sheard off 2 bolts on a rock, so the mid pipe was sracping, and ran open headers for about ohhh 20 miles home. Think that might have shot it? Anyways im planning on getting it tunned just to get that little extra ignition timing and possibly a few extra hp, i just want to have working parts.

TransformedBG · Post by **TransformedBG** » Fri Oct 13, 2006 10:25 am

also, wil this effect the gas mileage?

Razathorn · Post by **Razathorn** » Fri Oct 13, 2006 11:06 am

If your wideband isn't working, it most certianly will affect mileage.

Disabling odbII doesn't disable the primary o2 sensor.

The car should read 10.7 when it starts up for a short period of time. After a few moments, it should start reading other values and closed loop will center it on 14.7 when driving by trimming fuel. When you decelerate in gear, the o2 sensor should go to full lean as the fuel injectors are turned completly off... so, if it isn't doing that, your o2 sensor isn't reading correctly.

Wayne

TransformedBG · Post by **TransformedBG** » Fri Oct 13, 2006 11:14 am

Razathorn wrote:If your wideband isn't working, it most certianly will affect mileage.

Disabling odbII doesn't disable the primary o2 sensor.

The car should read 10.7 when it starts up for a short period of time. After a few moments, it should start reading other values and closed loop will center it on 14.7 when driving by trimming fuel. When you decelerate in gear, the o2 sensor should go to full lean as the fuel injectors are turned completly off... so, if it isn't doing that, your o2 sensor isn't reading correctly.

Wayne

Yeah thats kind of what i figured... ive noticed my fuel economy going down a little bit lately sooo im thinking thats the case... SO that would be the first o2 sensor on the test pipe correct?

Razathorn · Post by **Razathorn** » Fri Oct 13, 2006 4:07 pm

TransformedBG wrote:
Razathorn wrote:If your wideband isn't working, it most certianly will affect mileage.

Disabling odbII doesn't disable the primary o2 sensor.

The car should read 10.7 when it starts up for a short period of time. After a few moments, it should start reading other values and closed loop will center it on 14.7 when driving by trimming fuel. When you decelerate in gear, the o2 sensor should go to full lean as the fuel injectors are turned completly off... so, if it isn't doing that, your o2 sensor isn't reading correctly.

Wayne
Yeah thats kind of what i figured... ive noticed my fuel economy going down a little bit lately sooo im thinking thats the case... SO that would be the first o2 sensor on the test pipe correct?

Yes. I would suggest borrowing a friends primary o2 to ensure that's really it before dropping the money on a new one.

TransformedBG · Post by **TransformedBG** » Fri Oct 13, 2006 8:03 pm

If i can find someone ill do that.. Just out of currioustiy are there any other O2 sensors besides stock one that you can get?

Post by **Spunkster** » Mon Oct 16, 2006 9:18 am

No, you can only use the stock sensor.

TransformedBG · Post by **TransformedBG** » Sat Oct 21, 2006 4:58 pm

If i turn on the ODB II would it say if my o2 sensor isnt working?

tryfe · Post by **tryfe** » Sat Oct 21, 2006 11:21 pm

In KManager under the Closed Loop tab, did you disable P1167? I've noticed that when you disable that, it also disabled P1166. 1166 = Primary o2, 1167 = Secondary o2