aarcuda69062 wrote:
> In article <pDSte.73237$on1.52630@clgrps13>,
> "MasterBlaster" > wrote:
>
>
>>"Dave Baker" wrote
>>
>>
>>>>I read out their voltages during idle when warm using my Elm ODB
>>>>scantool, and plotted them.
>>>>
>>>>http://www.duijn.info/OxygenSensor.jpg
>>>>x in seconds, y in volts
>>
>>
>>
>>>1/1 appears to be fine. 1/2 should have a relatively flat output though
>>>which appears to indicate that the catalytic converter on that bank isn't
>>>doing much.
>>
>>1/2 is pretty flat... (it's below 1/1, not beside it).
>>Of course, that's assuming Martin labelled the charts correctly.
>
>
> If bank 1 catalytic convertor was storing oxygen properly, what
> would/should B1S1 be doing?
>
>
>>>2/1 is either dead or genuinely indicating a very weak mixture. However if
>>>the mixture really was very weak then 2/2 wouldn't be displaying higher
>>>readings so it appears that 2/1 really is dead. Until you replace 2/1
>>>there's little point in trying to decide if that converter or 2/2 are ok or
>>>not.
>>
>>2/1 (top right) is all over the place, with 2/2 (bottom right) following
>>close behind.
>>
>>Sticky/plugged injector, misfiring plug, bad wire, vacuum leak?
>
>
> Yup, something is amiss.
>
>
>>>Sensors just unscrew so if you can handle a spanner I very much doubt you
>>>need a 'pro' to do it for you.
>>
>>Yup.
>
>
> The OP would be wise to scrutinize the fuel trims.

When I recorded the traces, both long terms were -1, short terms
fluctuating a bit between 3 and 9.

Martijn