O2 Sensor Question

[stykthyn]

I have two different O2 sensors in my car. One is a black sleeve over the wires and has three wires, the other is a white sleeve and has four wires. I was under the impression that EECIV wiring was set up for a 3 wire sensor. My buddy put in the 4 wire when we got ready for the first fire up after the rebuild. Since then I've had a miss and my passenger bank( the one with the odd sensor) reeks of fuel. Could the four wire sensor be the culprit?

 

[madspeed]

what year, the 87?

 

[stykthyn]

yes. its an 87

 

[madspeed]

 

[madspeed]

looks like you have 1 wrong sensor, as per the diagram they are both 3 wires

 

[stykthyn]

sho nuff. 3 wires it is. that will likely nix my rich condition, hopefully the stumble is a by product of that as well.

 

[madspeed]

most likely

 

[mikestang63]

To the best of my knowledge you need the 3 wire. I replaced on of mine about a year ago. The 4 wire O2 are grounded through the harness, while the 3 wire O2 sensors ground through the body.

Wiring is as follows
gray wire is the ground
black is signal
white wires are heater

If you tried to use the 4 wire on a three wire car, you don't have a ground. The connector will actually plug in, but the mating connector on the car harness will not provide a ground and you can fry your EEC.

Are you getting a CEL?

 

[stykthyn]

not for the O2s which is why I never questioned it.

 

[madspeed]

Pull codes yet? Looks like you found the problem, but i'd run your codes for sure. At least run them after you swap in the correct sensor and clear them

 

[stykthyn]

yes, all my codes were for my smog pump and charcoal canister which have been removed. Had one for the TPS but that has been fixed. I plan on replacing both sensors, will pull codes and report back after that.

 

[mikestang63]

Pretty sure the part #
Bosch 13942

 

[Grabbin' Asphalt]

at @-zone the direct fit(shorter wire harness) was more $$$ than the universal o2(longer wire). I used a tie strap no issues and save a little $$

 

[stykthyn]

I saw a 3 dollar difference between the universal and the direct fit. one was 36 and the other 39.

 

[Grabbin' Asphalt]

I saw a 3 dollar difference between the universal and the direct fit. one was 36 and the other 39.

Now you know, .......and knowing is 1/2 the battle, ...G.I Joe!!!

That's $6 towards gas, nice combo meal after the install or ice cream plus at Sonic!!!!

 

[stykthyn]

I'm all about a double whopper. add bacon.

 

[Grabbin' Asphalt]

I'm all about a double whopper. add bacon.

D@mn I'm gettin' hungry now!!!

 

[jrichker]

I have two different O2 sensors in my car. One is a black sleeve over the wires and has three wires, the other is a white sleeve and has four wires. I was under the impression that EECIV wiring was set up for a 3 wire sensor. My buddy put in the 4 wire when we got ready for the first fire up after the rebuild. Since then I've had a miss and my passenger bank( the one with the odd sensor) reeks of fuel. Could the four wire sensor be the culprit?

The 4 wire sensors are for the 4 cylinder cars. The extra wire is a ground, and I don't know if it is the sensor ground or the heater ground. You need 2 good O2 sensors with the 3 wire setup that the 5.0 Fox Mustangs use.