So what exactly does the idle stabilizer do?  
Jeff

> On Jul 27, 2022, at 9:06 PM, OlRivrRat <OlRivrRat@COMCAST.NET> wrote:
> 
>        I’m pretty darned sure that the reason that DHs prediction was correct is that if any 1 of the
> 
> sensors that the ECU gets data from for Fuel Management is disconnected the ECU will go into Open Loop
> 
> & ignore all or most Fuel Management Sensor Data ~
> 
>        Disclaimer > Not Absolutely sure due to 77Yr Old Brain ~
> 
> 	
> 
>> On 27 Jul , 2022, at 10:09 AM, Eric Caron <ericcaron96@COMCAST.NET> wrote:
>> 
>> Hi Dave,
>> 
>>       Sadly that is well known as a unlikely cure.  The sensor tested out fine.  But due to a needed muffler a new one went in.  It also tests out perfectly.
>> 
>> Interestingly, Dennis predicted this would be the case and that it would be something else in the system. 
>> 
>> It will be so interesting and satisfying to solve this mystery.
>> 
>> Keep the tips coming.
>> 
>> Eric Caron 
>> 84 2.3 GW with 1.9 fuel management 
>> 
>> 
>> 
>>> On Jul 27, 2022, at 11:57 AM, David McNeely <davmcneely40@GMAIL.COM> wrote:
>>> 
>>> 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
>>>>