CamaroZ28.Com Message Board

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- LT1 Based Engine Tech (https://www.camaroz28.com/forums/lt1-based-engine-tech-9/)

- - O2 readings (https://www.camaroz28.com/forums/lt1-based-engine-tech-9/o2-readings-244800/)

95lt1&99ls1

Apr 1, 2004 11:14 PM

Please Help!! Car Running rich!!!!

What should my o2s be doing when in closed loop?

Car is running rich and lean...... Yeah I know:cry:

Injuneer

Apr 1, 2004 11:23 PM

In closed loop, the O2 sensor readings should cycle approx 10 times per second between 0xx and 9xx mVolts. Over a large sample of scan frames, they should average very close to 450mV. That is the nature of "closed loop" control.... overshoots rich, corrects by undershooting lean.

You might want to read the "Air/Fuel Management" section of this:

http://members.aol.com/InjuneerZZ/ScanMast.htm

95lt1&99ls1

Apr 1, 2004 11:28 PM

Well my o2 readings on the L Bank read in the 300...500..300... 700 and R Bank 124... 324...124...124... etc...

The Car at idle is showing to be running rich LTC Left 120 and Right 113.

What would cause this?

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