[Shotimes] Oxygen Sensor Question

[Donald Mallinson]

Oh, and most people replace 02 sensors when they get a code 
related to the sensor, but what is happening is that 
something upstream of the sensor is wrong (leaking fuel 
injector, Crankcase vent system etc) is bad and causing the 
exhaust mixture to be off, and the sensor is doing exactly 
what it is designed to do, alert you to the problem.

Don Mallinson

Leigh Smith wrote:

> Someone correct me if I'm wrong, but I'm under the impression O2 sensors are
> changed much more often than necessary. An aged sensor should have almost no
> effect on steady state cruise, or emmisions, unless poisioned or obviously
> broken (codes). (My 280K SHO still passed NJ emissions with original cats
> and original O2 sensors and 28mpg)
> Has anyone ever had new O2 sensors change emissions or increase gas mileage?
> Where the sensor had not obviously failed(codes)?
> The impression I'm under is that an aged but not yet failed O2 sensor would
> cause a part throtlle "power" application to go very slightly lean, possibly
> affecting power and mileage. But how much? Noticably?
> Anybody confirm this?
> Lee
> ----- Original Message ----- 
> From: "Kenneth Epperly" <epperly1@optonline.net>
> To: "SHO Times" <shotimes@autox.team.net>
> Sent: Saturday, November 20, 2004 5:43 PM
> Subject: Re: [Shotimes] Emissions question
> 
> 
> 
>>Yes this is what info I am looking for. There is no miss, has a new Y-pipe
>>also need to check water temp and scan for any codes. Might change O2
>>sensors if nothing else shows up. this is NJ also.
>>
>>        Ken
>>----- Original Message ----- 
>>From: "Leigh Smith" <leighsm@comcast.net>
>>To: "Kenneth Epperly" <epperly1@optonline.net>; "SHO Times"
>><shotimes@autox.team.net>
>>Sent: Saturday, November 20, 2004 5:06 PM
>>Subject: Re: [Shotimes] Emissions question
>>
>>
>>
>>>I'd assume misfire & lean. %CO goes to zero, NOX skyrockets. Curve? is
>>>almost straight up. Too much heat.
>>>FYI, my all-new 1200 mile SHO engine just passed at 662 ppm NOX, 11 ppm
>>
>>HC,
>>
>>>and 0.10 %CO on NJ state chassis dyno.
>>>:-)
>>>Lee
>>>94 MTX
>>>
>>>----- Original Message ----- 
>>>From: "Kenneth Epperly" <epperly1@optonline.net>
>>>To: "SHO Times" <shotimes@autox.team.net>
>>>Sent: Saturday, November 20, 2004 2:41 PM
>>>Subject: [Shotimes] Emissions question
>>>
>>>
>>>
>>>>As I frequently go brain dead and do not remember what is out of
>>>
>>>adjustment. 92 SHO NO2 way high 1000 ppm over, CO2 way under 0.000.
>>>
>>>>
>>>>            thanks, Ken
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>>
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