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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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#2
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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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Scott Keller - GNTTYPE Founder & Moderator
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#3
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Re: O2 Readings
I was concerned about it being all over the place.
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#4
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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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Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#5
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Re: O2 Readings
Thanks for the info.
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