Thanks David
Ill try that and report back. 
Plugs and exhaust carboned up so I assume running rich.

Bob
 
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> On 22, Mar2020, at 12:37 PM, David Beierl <dbeierl@gmail.com> wrote:
> 
> 
> 
> On Sun, Mar 22, 2020 at 12:25 PM mccullough bob <mbob1950@gmail.com <mailto:mbob1950@gmail.com>> wrote:
> 
> Probably kicking ECU back into open loop for bit?
>  
> Yes, exactly.  ECU ignores O2 for a bit after starting even if engine is warm enough and sensor signals ready.  Temp-II OTOH acts even during cranking.
> 
> I found that disconecting the o2 sensor wire solves this problem. Engine runs good. Revs normally and climbs hills well
> It is running rich as expected. 
> 
> If everything else is in good shape it shouldn't run rich.
>   
> With engine running and o2 sensor connected, Ive got 0.92 v  sensor to ground. 
> Running and O2 disconnected   .91v on sensor and .44v on harness to ECU
> Sensor wire is not shorted to ground. o2 heater has 12v
> 
> Unplug the heater and see what happens to sensor voltage.
> 
> Yrs,
> d