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

[chris]

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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