Coolant temp and the temp of the O2 sensor, late model obd11 engines have a
heated sensor, no mention your year though.
"Scott Buchanan" <t120rv@[EMAIL PROTECTED]
> wrote in message
news:BeCdnZh4R99r9JDVnZ2dnUVZ_gydnZ2d@[EMAIL PROTECTED]
> My car generally runs good. A problem is that sometimes, about a minute
> after a cold start, it will stumble for a few seconds. Usually I'll be
in
> a
> parking lot or in the driveway so it is not much of an issue. Last week
it
> happened after I pulled into traffic.
>
> A scan tool shows that it goes into closed loop about a minute after a
> cold
> start (40 deg F.). It cycles back to open loop then closed several times
> before it stays closed. This happened before the O2 sensor reached .5
> volts.
> I think that this might be a clue to the problem. Once running hot, the
O2
> sensor will cycle from rich to lean several times a second.
>
> My question is what allows the engine to go into closed loop?
>
> Thanks
>
>
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