91 100 Rough idle and no throttle response after warmup - Update

[Huw Powell]

> I hooked up an ammeter to measure Differential Pressure Regulator Current.
> And I hooked up a digital voltmeter to the oxygen sensor lead, oxy sensor
> connected to harness connector.

> 5min 30 sec - reg current at 15ma, ox sens at -.5v
> 6min 30sec - reg current at 20ma,ox sens at -.5v
> 7min 00sec - reg current at 18ma,ox sens at -.5v
> 7min 30sec - reg current at 3ma,ox sens at -.5v

> Now I have to figure out what all this means. I think the oxygen sensor is
> bad.

Me too.  The OXS voltage is supposed to fluctuate steadily over a few
second cycle, up and down around .5 volts.  Yours appears to be locked
into .5 v, which is probably due to the presence in the ECU of a "ghost"
voltage produced by the circuitry therein (you should be able to measure
this .5 v at the OXS harness, ECU side, with the OXS unplugged).

with it unplugged you should run ok, in the fairly decent limp home mode
of CISE3 (defaults to 0 mA).

with it working, the DPR current should flustuate as the OXS voltage
does, above and below 0 mA, btw.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/