In a message dated 11/9/98 9:56:09 PM Central Standard Time,
Frank.T.Holloway@KP.ORG writes:
> As an engine is warming up, the computer is actually operating in "open
> loop" mode (relying on values retrieved from the maps within the computer).
> Once operating
> temperature is reached, the computer will operate in "closed loop" mode
> during idle and cruise. In "closed loop" the computer relies on the O2
> sensor for fine tuning
> the fuel/air ratio. If operating temperatures are not reached, then the
> computer will not go into "closed loop". In the OBD-II vehicles, there are
> actually two variables
> the computer looks at, the coolant temperature, and the amount of time it
> takes for the engine to reach operating temperature. If either of these do
> not meet the
> preprogrammed values, then a check engine light. My thoughts.....
>
> Frank
>
Thank you Frank for the information. I new someone out there had the OBDII
info.
Gene
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