Air/Fuel Gauge - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-10-2008
nathan.payton's Avatar
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Icon4 Air/Fuel Gauge

i have a 94 ranger witht he four wire wonder oxygen sensor and i would like to know what wire and need to hook the air/fuel gauge 2 all that i know is that i have a blck and a blue and 2 other ones .
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Old 10-10-2008
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I cant really offer any hekp on this, Although I do have a question.
Why Are you installing a air\fuel gauge, I have seen a few threads on this lately and was wondering the purpose for it was.
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Old 10-10-2008
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The a/f gauge displays the afr(air fuel ratio). It helps when you are tuning your computer by telling you if you are lean or rich.
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Old 10-10-2008
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Tap into the gray/light blue wire in the harness between PCM and the sensor connector. I prefer to make the connection closer to the PCM because it is in a cleaner/drier location that down by the sensor.
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Old 10-12-2008
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A lot of people "in the know" will say this is not a way to judge your a/f by. It's a "narrow band" sensor and is only accurate when close to stoich. (14.64:1 a/f ratio)

However I've had my wide band hooked up for about 2 months solid. I watch it and I watch one of the stock 02s on my scanguage. And I'll tell you this. It's repeatable and accurate down to about the 12.0 - 12.5 area. Richer than that and there is not much difference... which is really too rich anyway.

I'm confident enough in having compaired them side by side that I've taken the wideband out of my truck and just use the scanguage. Next summer I'll most likely spray like this too.

Rich
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Old 10-13-2008
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okay so i hooked th wire to the grey/w blue wire and iam haveing the problem with the check engine light comes on every once and a while and goes off. i have the codes ran and it says that the mas air flow sensor has failed it didint start doing that until i hooked up the gauge ( i have hooked thses up before and never had this much problem) the truck still runs fine with the light on but how do i fix the problem with the gauge messing with it.
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Old 10-13-2008
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Connecting the A/F gauge to the O2 signal wire should not cause the MAF code. If you have an oiled element air filter (K&N type), it may have contaminated the hot wire in the MAF.
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