Reading into LTFC figures.

[Richard Wakeling]

Hi Ross,
    How old is the O2 sensor? Might be a good idea to fit a new one, reset  your
BLM  to 128 and see if the same learn pattern develops. I come across many
faulty O2 and they seem to fail in different ways. Try logging O2 against closed
loop. This often helps me in deciding if the O2 is Strange. How long is it
taking the O2 to start operating from cold? You will find a new one will get
going real quick.
    I have had cars come to me that run like dogs and just resetting the BLM was
enough temporally  to cure the derivability until it reprograms its self back to
being undrivable due to a faulty O2 sensor.

Cheers Richard.

Ross Myers wrote:

> Hi All,
>
> Been doing some ECM logging lately (which is O.K as far as the greenies
> go!!). Anyway, the LTFC values on my car tend towards the calibrations
> possibly being too rich, with most of the LTFC numbers down around 117 or
> so.
> But I am wondering. This is a single O2 system on a V8, so the left bank is
> really determining the overall mixture readings, correct?.
> What if 1 cylinder is not firing nicely and is tending to drive the O2
> readings rich.
> How can I determine if it is a Calibration issue, a lazy O2 (although it
> seems quite active on the data I'm getting) or a slight misfire?.
> I'd like to somehow establish the motor and sensors are 100% mechanically
> O.K before I go taking out fuel in the cals.
>
> Thanks,
> Ross Myers
> Melbourne, Australia
> E-mail : ponty at axis.jeack.com.au
> Stuff : http://www.jeack.com.au/~ponty
> <><><><><><><><><><><><><><><><><><><>
>
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