tecart

1986 944 turbo:i'm installing a huntley EGO1 O2 4 wire sensor, i put a new stock 3 wire O2 sensor on last year, my delima is this: can i save the stock 02 sensor and its wires so i can resell it? when i install the 4 wire sensor how do i hook up the 4 wires without splicing into the 3 wire stock harness like derrick said to do? basically the EGO1 has 4 wires that are only about 6 inches long and thats it. This means i need to cut into the long stock 3 wire o2 harness and splice 3 O2 wires to 3 then run the 4th wire to the battery for ground. I think this means it will be tough to resell my good 02 sensor as it will then have 3 short wires and no snap/push on connector (near the the firewall)for the second section of stock 02 harness piece, any ideas as to how to hook up this new 02 sensor but keep my stock 02 sensor or does it have to be spliced into it and the rest thrown out and this is what most are doing? P.S. i dont want to solder into the DME box/computer box areas, i prefer to do the wire tapping at or near the 02 sensor hole in the crossover pipe,or near the back of the firewall, thanks for any help <img src="confused.gif" border="0">

smkn951

hi, i also bought a 1986 944t in jan 02 and the guy i bought from said he installed an ego1 sensor on it, but i don't know where this thing is nor what it looks like, if you can describe it's supposedly location and i might be able to help a bit.thanks
sincerly carl

tazman

From what I was told you can not tap into the O2 wire on the other side of the conector because it is a sheilded cable going to the DME. I think you have to cut the wires on your other sensor unless you can find somebody who will buy yours and send you their old one.

tecart

now thats a good idea there, id be willing to sell my good sensor for like 75 bucks inc. shipping but in return i could ask for their bad sensor with its wires and end piece connector, great idea, but still wonder if all who did the ego1 upgrade cut into the first or second o2 wiring sections, if they do in the first section(meaning closest to the crossoverpipe to the firewall connector) what did they do to install the ego1 because its wires are only 6-8 inches long from the sensor and the 4th wire needs to goto the battery i assume so how did people reshield 3-4 feet of wiring, just wonder others setup on this install please reply

Bri Bro

I haven't hooked one up but I think this is how you do it. Don't need to run a wire to the battery. Just tap into the cable for three of the connections and the forth goes to chassis ground.

O2 connector pinout is:
Pin 1 Signal output
Pin 2 +12 volts through the DME relay
Pin 3 Ground

Four wire EGO1
LABEL DESCRIPTION WIRE COLOR
SIGO + Signal output Black
SIGO - Signal common Gray
Heater +12V White
Heater chassis ground White

Connect pin 1 to the Black wire
Connect pin 2 to one of the white wires
Connect pin 3 to the gray wire
Connect the other white wire to a chassis ground.

One point, the O2 heater current is rated at TBD Ma. Don't know why they couldn't measure this but I would test the heater current draw on a test bench to see what the cold and hot currents are. The DME relay powers the fuel pump so it is rated for large currents but it would be nice to know what the sensor was drawing.

tazman

I just bought a 4 wire generic O2 sensor from Paragon. I did not hook it up yet but Jason at Paragon said that the grey wire is the one that is suppose to be grounded seperately (people say to battery for best results). I do not know if our sensors are the same but from what I have read here the 2 white wires on the sensors are for the heater. Agian from what I have read here people splice the wires from the plug to the O2 sensor. Do a search for O2 sensors and you will see all the stuff I am telling you and to verify I did not make any mistakes.