Fw: Rich in closed loop idle

[JN]

----- Original Message -----
From: "JN" <jwn at sgi.net>
To: <gmecm at diy-efi.org>
Sent: Tuesday, August 15, 2000 3:08 PM
Subject: Rich in closed loop idle


> Question for the experts.  89 Vette 7165 ECM (MAF)
>
> Say you are rich in closed loop idle.  How do you know if O2 is cold?  Say
> car has a mild cam with more duration than a stock cam and runs 50 psi
fuel
> pressure.  At idle in closed loop, the car puffs some black smoke and
> "sounds" rich since its lumpier than usual.  Exhaust smells strong like
> excess fuel.
>
> What table is modified to reduce the amount of fuel at open loop idle?  Is
> it the Open Loop AFR %Change vs. Temp?  If not what table is it?
>
> Thanks,
>
> Jason Norris
>
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