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Old 05-05-2000, 11:14 PM   #1
Scooby Newbie
Member#: 587
Join Date: Dec 1999
Location: Massillon, Ohio U.S.
Post Air / Fuel meter installation (HELP!)

First off, i suck with electronics. i just got an air fuel meter for my 2000 rs. the red wire goes to power, the blck goes to ground, and the violet goes to oxegen sensor wire, not exactly at the oxegen sensor, but after the connector. anyone know which wire, there are 4. 1 grey
1 red/yellow
1 blue/black
1 white/black
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Old 05-06-2000, 12:20 AM   #2
Scooby Newbie
Member#: 899
Join Date: Feb 2000
Chapter/Region: VIC
Location: Richmond

Hi, what kind of meter do you have? The correct diagrams for hookup are at www.lagging.com . I believe you need to tap into the ECU for the rear O2 sensor. There are 2 O2 sensors on the MY00, and the front one is a non-standard voltage, the rear is standard from 0-1volt output.

According to the diagram, the wire you want to tap would be no.18 on terminal B136. Now, I haven't done this yet myself because I am still in the process of getting an a/f meter, but this is what I would use.

Also, others have noted that because the second O2 sensor is a bit further back, you should add a couple of bars to the reading (if you have an autometer guage) to get a more accurate idea of what's going on.

Good luck, and let us know how it works out.
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Old 05-06-2000, 02:29 PM   #3
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Member#: 788
Join Date: Jan 2000
1989 GMC Sierra 1500
Broke Transmission Pearl



Could you or anyone explain or recommend a site that talks about a/f ratio and bars?
I have a SAFC and want to know how to tune it using the 02 sensor monitor. I've heard that .87 is a good reading, what if its lower or higher. I don't want to lean out my engine too much.

Any help would be appreciated.

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Old 05-06-2000, 05:38 PM   #4
Scooby Guru
Member#: 329
Join Date: Sep 1999
Chapter/Region: Tri-State
Location: NJ
1995 325i
Arctic Gray


Can an EGT gauge serve the same purpose as an A/F gauge?

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Old 05-07-2000, 03:26 AM   #5
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Member#: 899
Join Date: Feb 2000
Chapter/Region: VIC
Location: Richmond

I'm not totally sure, but I was told by a mechanic that an EGT can be even more accurate for tuning than an A/F guage. You need to mount the sensor close to the engine though, like in the headers.
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Old 05-07-2000, 03:30 AM   #6
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Member#: 899
Join Date: Feb 2000
Chapter/Region: VIC
Location: Richmond

Woohoo, I'm a specialist now!

Max, AFAIK, the bars refer to the LED bars in the guage, which light up sequentially according to the meter's reading. I think there's a bunch, maybe 30? divided into sections of red (lean), yellow (stoich), and green (rich).

The thing with the O2 sensors is that they are especially sensitive over the stoich area, so that all of the yellow ones are in a very narrow range, but when you get into red or green, there's more of a difference in voltage needed to produce a change.

I don't actually have the meter, so maybe someone who does can clarify any misinformation I've just posted under my new title of "specialist" (indeed!)
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Old 05-07-2000, 12:47 PM   #7
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Join Date: Jun 1999
Location: Naperville, IL
2005 Legacy GT
98 BMW 540i LS2/T56


An egt gauge can give you some of the info that an a/f ratio gauge gives you, but they are (obviously) measuring different things. The O2 sensor is going to give you a direct measurement of the current (well, a second or so ago) mixture, and they do a good job if you are pretty near 14.7:1. An EGT will give you the exhaust temps, with higher usually meaning leaner and lower meaning richer, but they will only reallly give you an idea of the mixture at wide open throttle.
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