[Diy_efi] Post 4-Wire O2 Sensor Swap Observations...

[chris]

I wish I knew but honestly I know diddly about the programming. All I know
is the recaled chip worked good.


-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of charles at taildragger.info
Sent: Friday, April 22, 2005 11:32 AM
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] Post 4-Wire O2 Sensor Swap Observations...


Do you know what changed?  I have headers and my idle is always lean, I'm
not sure if I just need to change my VE table.  That's where I was going
to start.

> RE: [Diy_efi] Post 4-Wire O2 Sensor Swap Observations...In my case (Howell
> system) the popping was from an error in prom cal. Howell said my original
> prom cal was for a stock engine without headers. My engine has headers
> which
> changes the idle mixture requirement.
> A quick re-cal by Howell solved my popping problems.
>
> This is my take on this:
> When you decelerate you are basically going to idle. Exhaust leak can
> change
> idle mixture requirements do to an increase in exhaust gas flow ability
> through the engine or decrease in exhaust system restriction. The O2
> sensor
> may read lean if the exhaust leak changes the idle mixture to allow more
> air.
>
>   -----Original Message-----
>   From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Donovan, Larry
>   Sent: Friday, April 22, 2005 10:20 AM
>   To: 'diy_efi at diy-efi.org'
>   Subject: RE: [Diy_efi] Post 4-Wire O2 Sensor Swap Observations...
>
>
>
>
>   -----Original Message-----
>   From: David Cooley [mailto:n5xmt at bellsouth.net]
>   Sent: Friday, April 22, 2005 12:35 PM
>   To: 'Mike Frels'; diy_efi at diy-efi.org
>   Subject: RE: [Diy_efi] Post 4-Wire O2 Sensor Swap Observations...
>
>   Popping on decel is from lean, not rich...
>   And if you had an exhaust leak before the O2, it may read lean, but
> mileage would go down the toilet as it would be richening the mixture up
> to
> compensate.
>
>
>
>   Neither of these make sense to me. How can popping be from lean and how
> can an exhaust leak cause the oxygen sensor to read lean? How can an
> exhaust
> leak change the amount of oxygen remaining in the exhaust. Please explain.
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>

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