So if the problem only manifests itself with the O2 sensor plugged in, put
in a new O2 sensor.

On Wed, Jul 27, 2022 at 6:23 AM Eric Caron <ericcaron96@comcast.net> wrote:

> Hi collective mechanical mind.
>
> Reporting back still not solved running issue on 2.3 with 1.9 fuel
> management.
>
> Many steps still not done as friends are busy and summer is full of
> activities.
>
> Issue is still.
>
> Van idles high.
> Screw for idle control closed to max.
> Checked for vacuum leaks and not finding them.
> Tried to check timing but idle too high about 1,000 rpm and now and then a
> surge to 1,200 RPM .
>
> Engine  stumbles only when O2 plugged in and engine warm.  From a stop
> press excellerator and 2 out of three times it will hesitate stumble or
> skip.  Then find itself and go.  No O2 and it seems fine.
>
> Still need to try a friends ECU
>
> I’m hoping to soon have most of a recently working 1.9 ignition system to
> have for testing and spares.  I know diagnostics is better but still having
> working spares will make maintaining the old system easier.
>
> I don’t need it to be perfect but this skip and running rich needs to be
> resolved.
>
> Other then this van is currently ready for a long distance trip.
> I recently discovered that a long term friend from bus events has a twin
> to my van, year, color, and even the engine and fuel management.  Currently
> enjoying a trip up and down the east coast.  This gives me hope for a good
> running van in the future.
>
> Any additional tips are always appreciated.
>
> Eric Caron
>
> 84 GW 2.3 with 1.9 fuel management
>