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Old 04-20-2004, 08:26 AM   #3
lakepop
Scooby Specialist
 
Member#: 3851
Join Date: Jan 2001
Chapter/Region: MAIC
Location: WNY/NVA
Vehicle:
2007 Outback Ltd.
Champagne Gold

Wink

Normal......think of it this way.....closed loop is when the O2 sensor is feeding info to the computer.......open loop is when the O2 sensor is not feeding info to the computer.

When you first start your machine in the am.....until it warms to a specified temp.....it runs open loop....once there the computer gets info from the O2 sensor (and others) to manage your fuel and keep it at about 14.7/1 (air/fuel).

Now what happens when you mash the throttle......it wants to go full rich and disregard the O2 sensor.....ergo back to open loop.

OK don't flame me for not providing all the other minutia about how the system works.......just providing a simplistic view of what happens.

Hope this helped..........
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Last edited by lakepop; 04-22-2004 at 04:12 PM.
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