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View Full Version : A/F gauge second question 4 wire O2 sensor



1988starter
02-17-2004, 05:52 PM
A/F gauge second question. I have an extra O2 sensor that has 4 wires (not installed yet)would it be better to hook up an A/F gauge to that O2 sensor to one of the 2 wires that get grounded.

Magny
02-18-2004, 10:59 AM
4 wires on a O2 a/f gauge???? never seen one of these, unless one of them is for the backlight.

smufguy
02-18-2004, 11:08 AM
4 wires on a O2 a/f gauge???? never seen one of these, unless one of them is for the backlight.

He might have the Wideband O2 sensor. THe most accurate one is the O2 sensor with 5 wires that Turbo guys usually use to manage their A/F ratio to the exact decimal. A lot of VW guys i know use a WIde band.

Even K&N makes these with 3 wires running off of the O2 sensor.

Even tho the Aftermarket A/F gauge is said to be inaccurate, for a N/A motor like ours without crazy ass mods and high revs past the stock, it is perfect to find the stoich and lean and rich.

1988starter
02-18-2004, 04:27 PM
I know how to convert a new honda 4 wire to a old honda 1 wire style and I happen to have one around my house. I was wondering if I should use it.

smufguy
02-18-2004, 07:12 PM
why not just use our reg stock O2 sensor? The 4wire might do something crazy or its calibration might be different, i dont know. The VW guy i was talking about uses the wideband as just the sensor for the A/F gauge not as a sender for the ECU.

1988starter
02-18-2004, 07:52 PM
I was just wondering if it would be a better signal eventually I plan on converting to 2, 4 wire models with preheaters.

smufguy
02-18-2004, 09:05 PM
how about test out the new O2 sensors and see if it puts out the voltage as the stock one with the multimeter. The shop manual has a page in it where it shows how much voltage it should put out at idle and some high rpm i dont remember.

Mac
02-18-2004, 09:33 PM
It should read above 0.6 volts ay 5000 rpm and below 0.4 volts when throttle is released.

1988starter
02-18-2004, 09:56 PM
I would not be the first one to do this also When I read about how to do it on a lude page the guy mentioned that his A/f Meter reacted a lot more quickly after the conversion

smufguy
02-18-2004, 10:37 PM
Yeah, cuz u both are using the wideband O2 sensors thats why the lude guy felt his A/F gauge respond much quicker. Also from what i heard, these Wideband sensors can run an up of $400+ off the shelf (Not ebay price). I would love to get my hands on one, but i dont know if we can use this sensor as an input for out ecu, from what i believe they can be used only for monitoring. i dont know for sure tho. :cool2: