Eractic O2 sensor

[David Cooley]

At 02:42 PM 12/18/1999 -0500, you wrote:
>At 06:09 PM 12/17/99 -0800, you wrote:
> >    I have built Dave Morrill's O2 sensor on the efi332 web site, hooked
>it up
> >to my chevy truck.  At all throttle positions except full throttle the
>reading
> >on the O2 sensor meter is extremelly eractic.  It moves from 1 to 5 faster
> >than i can see it! But while at full throttle the reading is consistant 
> at 5!
> >Why would it be so eractic off of full throttle?
>
>I just had a simular issue with my own 02 sensor display.  My problem
>turned to to be grounds - bad engine to body ground strap fixed about 80%
>of the problem.   Grounded the exhaust pipe to the frame, solved the other
>20% of the problem.


If your O2 sensor holds a steady value any time other than when first 
started and at wide open throttle, there is a problem.  Look at a working 
O2 sensor on an oscilloscope... It transitions from near 0 volts to near 1 
volt about 5-10 times a second.

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David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
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