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Date:         Mon, 28 Apr 2003 19:46:40 -0700
Reply-To:     Eric Fournier <eric.fournier@ALAMEDANET.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Eric Fournier <eric.fournier@ALAMEDANET.NET>
Subject:      Re: Help Wiring O2 Sensor
In-Reply-To:  <20030428025317.4228.qmail@web13104.mail.yahoo.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed

It would be easier to worry more that your engine grounding strap is in good shape with good clean connections. It's just super easy to go 4-wire from 3 (and cheaper than going stock).

It's not like the sensor is a precision instrument. The O2 sensor is only good at approximating a lean or rich condition (in relation to the 14.72 parts air to 1 part fuel) based on the amount of oxygen in the exhaust. It's not good for indicating how rich or how lean. The curve is not very linear at all. According to some Bosch literature I have, 0.2 to 0.8 volts (approx.) would indicate a "ideal" mixture. Up to 0.2 volts is too lean and over 0.8 volts is too rich. These aren't exact figures, but you get the idea. The mixture will constantly fluctuate between rich and lean several times a second to keep the mixture in a reasonably narrow range. You can imagine the ECU going rich, lean, rich, lean, rich, lean...must be exhausting. Bad pun not intended, really. So, if your sensor output fluctuates and your exhaust CO is good with the sensor disconnected, you're good.

HTH.

Eric Fournier 91 GL

On Sunday, April 27, 2003, at 07:53 PM, Damon Campbell wrote:

> For kicks and giggles, what would be involved in > tossing in a 4-wire (or 3-wire, obviously) sensor into > a van with digijet FI? Is it just as simple as > triggering a relay off the ecu power source and the > running the juice from the always hot lead in the > little black wiring harness box? > > I don't know if i'd actually do that, but improving > grounding in an early model wbx wouldn't be a bad > thing, either... > > Thanks, > -Damon


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