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Old 11-15-2004, 01:29 PM   #1
danci1973
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Join Date: May 2002
Location: Maribor, Slovenia
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1995 Legacy Wagon
Silver

Default Stock O2 sensor for A/F gauge?

Hi!

Can one use the stock O2 sensor [of a '95 BG 2.0 NA] to check the A/F ration?

I know people do that on some other cars by simply hooking a Volt meter on the sensor, but I'm puzzled as some Subaru service manual suggests that the O2 sensor signal should be a sine wave!?

Thanks, D.

PS: Eventually I'm going to build a Wideband O2 controller for external use; I hope to be able to perfectly tune my carburated bike with it.
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Last edited by danci1973; 11-15-2004 at 01:34 PM.
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Old 11-15-2004, 01:49 PM   #2
Section 8
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Nevermind.

Last edited by Section 8; 11-15-2004 at 02:11 PM. Reason: Dumb post.
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Old 11-16-2004, 12:54 PM   #3
danci1973
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Quote:
Originally Posted by Section 8
Nevermind.
Is that a dumb question?

I tapped the signal wire of the O2 sensor. Using a plain analog voltmeter I measured signals from -0.25V (engine braking, no throttle) to 0.7V (WOT).

The -0.25V reading is weird - it should be anywhere from 0.01 to 0.9V... I guess I have bad grounding at some point - but if I add that 0.25V to the 0.7V readout that means that my car is running pig rich...

Right?

D.
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Old 11-17-2004, 02:34 PM   #4
Pocon
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You can use your rear O2 sensor signal to "measure" your A/F mix via a A/F gauge. The only shortfall of this technique is that the rear O2 is not that accurate. It's a narrow band sensor (.1V-1V).

Rich conditions produce a near 1V signal while a lean condition produces a near 0.1V signal.
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