02 Sensor Readings (2 Scantool Vids) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-28-2007, 06:46 PM   #1
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Default 02 Sensor Readings (2 Scantool Vids)




Is my 02 Sensor bad? I have no idea what the numbers should be. I checked for vacume leaks today. I'm trying to fix every little thing wrong with this car.

Thanks,
Andrew
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Old 08-28-2007, 10:37 PM   #2
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is the first at wot? if so thats normal.

what throttle percent was the second reading of 777 mV?
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Old 08-28-2007, 10:51 PM   #3
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I never went farther than 3/4 throttle when reving. One of my concerns is the 02 crosscounts. That seems low.
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Old 08-28-2007, 11:11 PM   #4
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when i was / (and still am) dealing with havin the mem-cal programed in the project in my sig. the guy programming said the the o2 voltage should be 900-950 @ wot. if ur only 75% then i would think thats a lil rich.

he also said it is a more accurate reading to check when the engine is under load. do you have some one to ride shotty while u drive. i had my lil brother come over to watch the readings.

(ohh and i have that exact same scanner. not bad for 200 bucks.)
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Old 08-29-2007, 12:07 AM   #5
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How old is it?


Mine looked like that and then I posted a question about cross counts. The responder said the counts should be greater meaning O2 sensor is tired.

I changed O2 sensor and have gotten better performance and gas mileage.

http://www.bonnevilleclub.com/forum/...ic.php?t=83359
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Old 08-29-2007, 12:12 AM   #6
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If someone can record while driving, you'll get better readings.
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Old 08-29-2007, 06:16 PM   #7
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Also whats the sensor do at Idle? Once up to temp it should have good readings even at idle... You should see plenty of swing from the sensor..

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