air fuel gauge help.

[Desperado]

1986 mustang with speed density. i have the sunpro cp8200 air fuel guage. my question is what wire on the o2 sensor do i hook it up to? it has 1 black and 2 white wires. it is hooked up now but is shows all the way lean and then when you rev it it starts to light the led right next to it but it is still 1 led from all the way lean. if i hook it up to the other white wire it shows full rich all the time.(have not driven it with it on the full rich to see if it comes down)

i am so lost cause i think my car is dead lean and i don't want to hurt the car. the plugs look brand new. the white part of the plug is nice and white. the ground strap is perfectly clean. the electrode is clean. i just got the car and it is not inspected so i can't really get out and drive it to see if the plugs color after some driving. i have had it around the neighborhood twice with some full throttle runs through first gear (5 speed)


so what wires to i hook it up to on the o2. here are the wire colors in order from outside to outside...... black white white.

the center wire and one of the outside ones are white.

 

[jrichker]

43 (Dark Blue/Lt Geen wire) or pin 29 (Dark Green/Pink wire) on the computer. Use Wire tap-ins from Radio shack P/N 64-3052. The computer is located under the passenger side kick panel. That keeps you from having to crawl under the car and make a weather proof splice in the wiring. You can use either wire, or run a SPDT switch and use both. Then you can use the switch to select which side to view.

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host)

http://www.veryuseful.com/mustang/t...91eecPinout.gif

The A/F gauges that use the O2 sensor signal will jump all over the place. The reason is that the O2 sensors "switch" between .2 volt lean and .6 volt rich with a curve that looks like the drop off a high cliff. The curve is almost straight up and down, so the voltage shoots from .2 to .6 and back down . again 2 or more times a second at cruse. You won't get much useful information except when the mixture is extremely lean or extremely rich, there is no middle ground.