O2 sensor readings, DB

[Bob Harris <b1werks2@xxxxxxxxxx>]

----- Original Message ----- 
From: <RWestra@xxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Thursday, January 24, 2002 2:23 PM
Subject: Re: IML: O2 sensor readings, DB


> Thanks guys for the very interesting insight into Oxygen sensors.
> I have one additional question.  What prompts the computer to 
> switch from open loop to closed loop?  Does it stay in open loop
> until it receives signals from the O2 sensor or is it prompted by
> some other input that the engine is warm enough to run in closed
> loop operation?
> 
> The reason for asking is that my 81 "stalling during warm up" 
> problem seems to occur at about the time I would expect the 
> O2 sensor to begin to operate.  Obviously this is a guess but 
> stalling seems to occur sometime between 5 and 15 minutes 
> after starting cold.  It seems to vary depending upon engine load.
> The heavier the load the earlier stalling begins.  I am about to
> change the O2 sensor but I am not really convinced that is my 
> problem.  
> 
>                                         Rolland Westra
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