02 sensor lean/rich transitions - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-26-2007, 01:39 PM   #1
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Default 02 sensor lean/rich transitions

I got an Auto-tap today with the GM enhanced peramiters and did a few readings on my car. I did one specifically on the 02 sensor and transitions between lean/rich in a 100 second span. In a little over a minute and a half, there were only 71 transitions. Doesn't that seem pretty low? That'* less than one transition per second!
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Old 01-26-2007, 01:43 PM   #2
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yes.. i would think it to be about 10 times a sec...
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Old 01-26-2007, 01:56 PM   #3
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on a related note, here'* my first scan with a few peramiters on it. I deleted about half of them on the table though because they were just system scans like "OBDII system ready, etc.)
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Everything seems to look pretty good. It'* good to atleast know I'm getting 0 knock retard. I'm running premium right now though so I'm going to see what it does in a week when I put regular in it.
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Old 01-26-2007, 02:35 PM   #4
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Here'* readings from just the oxygen sensor/engine speed.
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I don't know what it all means, so if someone could clarify.. it seems like the sensor is pretty slow to respond?
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Old 01-26-2007, 02:42 PM   #5
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Custom.. when you have that many parameters..it'* only reading at the interval mentioned next to the data, the toggling can be happening much more frequently.
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Old 01-26-2007, 02:44 PM   #6
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Quote:
Originally Posted by BillBoost37
Custom.. when you have that many parameters..it'* only reading at the interval mentioned next to the data, the toggling can be happening much more frequently.
True, but when I ran the test for just the oxygen sensor graph, it was still updating five times per second. You can see the MV of the sensor slowly rising/climbing on the graph. It looks like it takes a little over a second for the sensor to switch from lean to rich.
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Old 01-26-2007, 02:46 PM   #7
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Time for a fresh one..

How'* MPG?
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Old 01-26-2007, 02:51 PM   #8
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This time last year I was averaging 25.4 MPG. Right now I'm averaging 19 MPG. I can't even get over 22 MPG on highway drives. it'* sad.
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Old 01-26-2007, 02:54 PM   #9
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Your new tool just spent $80 for you. However the MPG return should be worth it.
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Old 01-26-2007, 03:43 PM   #10
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Custom, I think I am in agreement with Bill... seems the sensor is a bit on the slow side to toggle, Its functioning withing the proper range, but the toggle rate seems sluggish...

Even on my Old beater I can watch the mv on the sensor, as well I can watch it toggle rich lean.... In a 5 second period I usually see rich,lean,rich,lean,rich,lean...

If you have dropped that much milage and can do no better than 22 on the road you may be due for a new O2... Heck even 3.5 Shortstars should do better than 22 on the road with that 4T65-E

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