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Old 11-11-2008, 10:41 AM
rmoulderoh rmoulderoh is offline
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Default O2 Readings

I've attached a picture of a snapshot from a TurboLink recording. What's going on with O2 readings? I had the sensor replaced about 3 years ago.
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Old 11-11-2008, 01:03 PM
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Keller Keller is offline
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Question Re: O2 Readings

Can you explain what the car was doing here? Looks like a cruise situation to me?

How much time is on the screen?

Looks mostly normal, save for the time it stays down low. Are you concerned that it bounces around? That is normal. Are you concerned is not moving around enough?
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Old 11-11-2008, 02:37 PM
rmoulderoh rmoulderoh is offline
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Default Re: O2 Readings

I was concerned about it being all over the place.
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Old 11-11-2008, 04:25 PM
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Default Re: O2 Readings

O2s will be basically producing a sine wave when the motor is under no/light load. That's by design ...

A description of narrow band "switching" style O2 sensors ...

From the DashHawk manual (which I wrote):



The Oxygen Sensors in the “O2 Bx Sx” parameters are called “switching” type sensors. The basic operation involves the
ECU driving the air/fuel mixture rapidly from Rich to Lean (several times per second) and measuring the O2 sensor’s
response over a time period to determine the actual fuel/air mixture. This also allows the catalytic converter to function at
its peak efficiency, since it needs a certain amount of unburned fuel to operate.
In the above graphic, starting at the left, the ECU drives the mixture RICH and then starts to drive it LEAN. The BLUE
arrow represents the time it takes to drive from the RICH threshold (in this example 800mv) to the LEAN threshold (in this
example 200mv). The actual thresholds and time periods will vary with sensor types, manufacturer strategies and type of
fuel used.
The GREEN arrow represents the transition time from LEAN to RICH. The ECU strategy (in general terms) is trying to
make these times approximately equal. Averaged over the SENSOR PERIOD (YELLOW arrow), this results in a air/fuel
mixture that averages as stoichiometric (which in our example, is about 500mv).
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Old 11-15-2008, 06:29 PM
rmoulderoh rmoulderoh is offline
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Default Re: O2 Readings

Thanks for the info.
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