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Old 01-02-2006, 01:21 AM   #1
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default Can an O2 sensor read only lean?

My O2 sensor, which I am monitoring through a Perfect Power 6, never ever ever dips below 13.1. And thats if I feed it enough fuel it almost bogs.

It has no problem jumping up to the 20s when I let off the gas. And it reads perfect 14.6-14.7 when cruising.

But when under hard and not so hard accelleration, it barely, if ever, drops below 14.0.

I have run it on a dyno with a wideband, and the wideband showed I was getting down to the 11s. But I was unable to compare to the laptop at the time.

So, basic question.....Does your standard O2 sensor tend to suck? This sensor is less than a year old, but I have run tolulene and Torco through it daily.
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Old 01-02-2006, 09:25 AM   #2
quazimoto
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It depends on what sensor your reading off,the front or the rear one.But neither of those sensors are a true wideband.You need to purchase a wideband 02 meter that has a 5v outlet for the Perfect Power.Most do i believe,have a 1v and a 5v but just check before you buy.
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Old 01-02-2006, 12:48 PM   #3
Jaxx
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duh

narrow band 02 sensors won't read below 13.2 at all
and are inacurate every where except 14.7

basicly what a narrow band will tell you is if you are above or below stoimetric but the numbers are worthless
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Old 01-02-2006, 06:50 PM   #4
WolfPlayer
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Old 01-02-2006, 07:02 PM   #5
Jaxx
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intersting ... something huge missing from that though did you log the front o2 (not narrowband) or the rear

reddevils is not a wideband at all
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Old 01-02-2006, 11:19 PM   #6
reddevil
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1990 Legacy wagon
goes 12.387 @ 116.5

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Watched it today for a little bit after the wagon had been sitting for a few hours.

It is a single front unit by the way, a Bosch on a 90 legacy.

It dropped a few times down to 12.1 when I would let up on the gas, so it does read lower. But obviously its not a wideband that reads more accurately.
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Old 01-03-2006, 08:28 AM   #7
WolfPlayer
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Quote:
Originally Posted by Jaxx
intersting ... something huge missing from that though did you log the front o2 (not narrowband) or the rear

reddevils is not a wideband at all
Oh, definitely the front. The rear one is even more useless.

t
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