Open Loop Mode (165 ECM)

[mrvette]

If the O2 sensor cools off enough even in Minnesota winters to force open loop
ooeration ....a heated O2 sensor should be substituted....
GENE

peter paul fenske wrote:
> 
> Howday
> 
> Usually at idle the O2 sensor cools down, and the transitions
> become small enough for the ECM to disregard it
> and go into open loop.
> 
> Closed loop temp is relatively low, usually bout 125 d
> and learn a little bit higher 160 D or so.
> 
> later:peter
> 
> At 11:28 PM 7/29/98 -0600, you wrote:
> >
> >I was doing some tinkering last night and I noticed that with Diacom in
> >diag. mode the ECM went into open loop when temps were less than 185ish and
> >greater than 220. These are with the car idling in park and with the stock
> >PROM. Does anyone know if this is normal, seems like a small window for
> >closed loop?
> >
> >Thanks,
> >Drew
> >'89 Iroc-Z L98
> >
> >
> >