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Old 09-03-2000, 09:40 PM   #1
Scooby Newbie
Member#: 1992
Join Date: Jul 2000
Location: Port Jefferson, LI
Question O2 voltage question

MY 99RS W/ S-AFC I have my settings running in the plus's and i'm wondering, I hooked the blue wire to the B136 #7 at WOT i get about .83...but the reading isn't steady i know it'll decrease with throttle position but at wot it never stays at .8*** it jumps a little, Is this normal??
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Old 09-03-2000, 10:04 PM   #2
Scooby Guru
Member#: 329
Join Date: Sep 1999
Chapter/Region: Tri-State
Location: NJ
1995 325i
Arctic Gray


I'm not sure if this is what you're asking or not, but you can only reliably monitor the O2 sensor voltages at WOT. At any other throttle position, the ECU is constantly changing the A/F mixture to try to achieve optimum results, so the readings will bounce around enough so they're meaningless.

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Old 09-04-2000, 10:49 AM   #3
Scooby Guru
Member#: 248
Join Date: Sep 1999
Chapter/Region: NESIC

Well when you are at true WOT it should stay steady. If you are increasing speed and RPM's it will jump slightly...but when you absolutley have the gas down all the way it shouldn't move.


Ps- Possible cuases if it does still move i have no idea.
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Old 09-05-2000, 06:42 AM   #4
Scooby Specialist
Member#: 759
Join Date: Jan 2000
Chapter/Region: NESIC
Location: Warwick, RI
2004 WRX
2000 SV650


How much does it jump? I look at my Jumptronix A/F meter when tuning, and it has a lower resolution than the AFC, but I noticed with the stock intake that voltage can go from say .85 to .87. It always stays pretty close to the same number, but can move around .01, .02 V or so. If this is all the movement you see I wouldn't be too worried, but if it is like .05V or more that might be a different story. Of course since I put my JC Sports intake on I see a lot more variation in voltages at WOT, but since they are all nice and rich I am not concerened.
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