Hello Steve
You can test a little more along the same line. Un hook the o2 sensor
and connect the wire to the + end of a flash light battery (1.5
volts) the current should go to -20 ma. You can ohm meter the O2
sensor body to ground. Anything lowish is acceptable since the O2
input is such a high impedance. The wire from the O2 sensor connector
to the ECU is shielded the wire from the connector to the sensor is
not shielded.
If you have a high impedance voltmeter it is easy to measure the O2
sensor output. Should flop around a bit when you goose the throttle,
etc. No need to wonder.
Lotsa luck Eric
At 07:13 PM 9/5/2007, Steven Arguello wrote:
when I unplug it nothing happens, if I ground it, the current goes to
+-20mA, which the Bentley says means the ECU is OK.
I swapped the DPR, Knock box, airbox, ECU and lastly the O2 sensor
w/spares I have and no change.
I imagine the O2 sensor needs a ground. Has anyone ever heard of
grounding problems with the O2 sensor?
I'll pull the sensor and check my soldering....
the O2 sensor wire is shielded. I remember something in the Bentley
about where the shield is grounded but can't find it now. Could a bad
shield have anything to do with it?
thanks again,
Steve
On Sep 4, 2007, at 9:44 PM, John S. Lagnese wrote:
> If you unplug it the car should run richer and eliminate the
> problem, if the problem is still there its most likely not the OXS.
> John
> ----- Original Message ----- From: "Steven Arguello"
> <[email protected]>
> To: "a2-16v" <[email protected]>
> Sent: Tuesday, September 04, 2007 7:01 PM
> Subject: [a2-16v-list] OXS problem??
>
>
>> Ongoing (year+) hesitating/misfire under load. Did all the tests in
>> the Bentley (again). DPR current 10.3mA no fluctuation. New O2
>> sensor, and I even tried putting the old one back. Before I buy a 3rd
>> sensor, I wanted to double check. How is the O2 sensor ground?
>> Through the pipe/manifold? Any chance that grounding might be the
>> problem?
>> thanks,
>> Steve
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