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Old 03-01-2006, 11:19 AM   #1
Lachlan
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Member#: 19470
Join Date: May 2002
Chapter/Region: SWIC
Location: albuquerque, NM
Vehicle:
1981 Brat GL
Blue

Default oxygen sensor voltage on teh EJ20K

I just installed an a/f gauge (I know, it's just a glorified galvanometer, but that's what it's good for) and I've been watching the voltage on the oxygen sensor. When cruising, it almost looks like breathing--it will be stoich (.5is V)for a second and then go down to lean (0ish V) and then back up to stoich, like a yo-yo, every two seconds or so. I'm assuming that's not something you want in an oxygen sensor, although I can't see that it's causing any problems in the car at speed. Any thoughts?
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Old 03-01-2006, 10:06 PM   #2
Scoobie Steve
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Subaru L Ver 6 STi Type R

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Its doing exaclty what it should be doing.
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Old 03-01-2006, 10:19 PM   #3
Lachlan
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Oh? Sounds queer.
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Old 03-01-2006, 10:27 PM   #4
johnkaldar
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1999 gc8 RS/sti-ra
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computer searching for the sweet spot with little load on car
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Old 03-02-2006, 01:54 AM   #5
Hurley 2.5 WRS
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Blue Ridge Pearl

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and thats one reason why those guages are useless. get a wide band, way better.
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Old 03-02-2006, 10:16 AM   #6
Lachlan
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1981 Brat GL
Blue

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A wideband is useful for tuning, but a wideband won't tell you what voltage your ecu is seeing from the oxygen sensor itself.
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