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Date:   Thu, 11 Sep 2003 15:35:05 -0600
Reply-To:   Chad Morris <chad@ALLMORRIS.COM>
Sender:   Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:   Chad Morris <chad@ALLMORRIS.COM>
Subject:   Re: O2 readings
Content-Type:   text/plain; charset="iso-8859-1"

Thanks again. I found the post you mentioned here: http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind0103B&L=vanagon&D=0&m=140137&P=3822

I'll give it a try.

----- Original Message ----- From: "Tom Young" <tomyoung1@comcast.net> To: "Chad Morris" <chad@allmorris.com> Sent: Thursday, September 11, 2003 3:03 PM Subject: Re: O2 readings

> From: "Chad Morris" <chad@allmorris.com> > To: "Tom Young" <tomyoung1@comcast.net>; <vanagon@GERRY.VANAGON.COM> > Sent: Thursday, September 11, 2003 1:10 PM > Subject: Re: O2 readings > > > > Thanks, Tom. You are correct, I did mean that I took the measurement > > inline. I did, however also take a measurement with the O2 sensor > > disconnected and it measured generally about the same, between .81 and .89 > > volts. I will take your advice and try to correct my too rich situation > by > > adjusting the air/fuel mixture screw. I am assuming I do this with the O2 > > sensor disconnected from the ECU, correct? > > Yes. > > > > I also remember reading something about adjusting the Air Flow Meter to > > change lean/rich condition. I think the manual says don't touch it, it is > > calibrated at the factory, but judging from the orange silicone sealing > > around the lid of the AFM, someone messed with it before I bought the van. > > Do I dare go there? > > > Yes. The spring gets weak over time leading to a too-rich situation. > Eventually even backing the adjusting screw out all the way won't lean > things enough. The AFM screw-tightening procedure is well documented in the > archives; I know I've written it up several times, and others have too. > > > > > > > > ----- Original Message ----- > > From: "Tom Young" <tomyoung1@comcast.net> > > To: "Chad Morris" <chad@ALLMORRIS.COM>; <vanagon@GERRY.VANAGON.COM> > > Sent: Thursday, September 11, 2003 12:42 PM > > Subject: Re: O2 readings > > > > > > > When you say you're getting those readings on the "O2 sensor with it > > hooked > > > up to the ECU" I assume you mean the voltmeter is "inline" between the > O2 > > > sensor and the ECU? If so, re-run your test with the O2 sensor > > > disconnected. The O2 sensor should put out a voltage of right around .5 > > > volts at the correct air/fuel mixture (the graph of voltage vs. mixture > is > > > *very* steep right around the "ideal" mixture, so you should see a rapid > > > fluctuation above and below .5 volts) with higher voltage indicating > "too > > > rich" and lower voltage indicating "too lean." What you're reading is > the > > > output of the O2 sensor, the ECU's attempts to correct, and whatever > > > distortion you're introducing with the voltmeter. > > > > > > Doing the test with the O2 sensor disconnected will give you an > indication > > > of the basic mixture before the ECU tries to correct it. > > > > > > You adjust the air/fuel mixture after making sure that every other > aspect > > of > > > the engine - mechanical, ignition, vacuum, etc. - is correct. > Adjustment > > of > > > the air/fuel mixture screw is the first thing to try to correct a "too > > rich" > > > situation > > > --------------------------------------------------------------- > > > Tom Young '81 Vanagon > > > Lafayette, CA 94549 '82 Westfalia > > > --------------------------------------------------------------- > > > ----- Original Message ----- > > > From: "Chad Morris" <chad@ALLMORRIS.COM> > > > To: <vanagon@GERRY.VANAGON.COM> > > > Sent: Thursday, September 11, 2003 10:20 AM > > > Subject: O2 readings > > > > > > > > > I am reading between .81 and .89 volts on my O2 sensor with it hooked up > > to > > > the ECU. I am thinking that indicates I am running rich. Assuming my > O2 > > > sensor is good, what would the ideal reading be? If it is indeed > running > > > rich, should I be able to remedy that simply by turning the air/fuel > > mixture > > > screw, or will I need to mess with something else to get it to run > right? > > > Any thoughts? > > > > > > > > > > > > >


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