When I tried to set my DigiJet to .5 with the 02 sensor disconnected, I also had no power just off of idle. It would also cause the idle speed to surge.

I set mine richer until it doesn't have the flat spot off of idle.

I also monitor my 02 readings while driving whith the 'digitool' and the Ecu appears to handle everything fine when the 02 sensor is reconnected.

Chuck Mathis <cmathis@HOUSTON.RR.COM> wrote:'85, 1.9l Digijet, Automatic.

While trying to get Roland ready for the state emissions check I
replaced the O2 sensor. I tried setting the AFM per the instructions
posted a few weeks ago and all the readings were good - O2 staying
between .4 and .5 at idle reading with a multi-meter with the sensor
disconnected from the system. The engine ran like a champ until I
plugged the sensor back in and tried to zip off to the test station --
suddenly it has no power off idle and the O2 readings on my digitool
are going negative at the same time. Figuring it must be a short in
the fat green wire i disconnected the ECU and pulled the cover off the
plug. With one probe in pin 5 and the other in the female connector on
the wire it reads 0 resistance and no amount of bending, twisting and
turning the green wire changes that - seems like that should cause the
resistance to increase if there is a short. The shielding checks out
with a big fat 0 and between the shielding and the conductor I get an
infinite reading probing both ends in various combinations. There is a
white wire spliced to the green that runs to pin 6. With the probe in
pin 6 and the green female I get infinite resistance. Same with the
probes in 5 and 6, 5 and the splice, and 6 and the splice.

From all this poking around I believe that the shielded green wire is
just fine and the white wire to pin 6 splice is bad. Am I right or do
I need more beer? (I'll have a beer anyway) What is the best way to
fix this? I'm thinking remove the insulation from the splice, solder
it then wrap it up good.

Chuck
'85 Wolfsburg Westy - 'Roland the Road Buffalo'

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