young Dizzy

When i brought my rx7 not 2 long ago the guy i brought if from said that it needed a o2 sensor cuz it runs really rich with out it. So i brought one and put it in but i cant find the other end that plugs into the engine i dont think it there but the guy said it is. Where would this plug on the engine be?

w.sen

iTrader: (8)

What year?

S4 is near the rear of the motor on the passenger side .

gracer7-rx7

iTrader: (16)

same thing on the 3rd gen.

look for a black plug hanging around back there.

w.sen

iTrader: (8)

S4's is like a greenish plug. Single wire connection.

RotaryRocket88

iTrader: (7)

Profile lists an '87 TII, so I'd assume S4 is the right guess. As mentioned, it's a green plug with a single black wire. It comes off the harness near the primary injectors, and loops behind the intake manifold on the passenger side.

w.sen

iTrader: (8)

acually i went and looked its a brownish plug.. i got my uim off

RotaryRocket88

iTrader: (7)

Yeah, sometimes they're brown/tan. I've seen that on some engines too.

young Dizzy

man i been lookin all over i really cant find this **** i gotta find a pic of where it would be cuz i dont even think its there

badpescado

all i can offer is this: http://www.rx7city.com/89-91manual.htm maybe you can get the 86-88 manual at the same place? im not even sure if they are different?

rxtasy3

iTrader: (2)

if u had to unplug the one u took out, how can u not find it now?

RotaryRocket88

iTrader: (7)

^ It sounds like the previous owner sold the car without an 02 sensor installed.

It's likely someone broke/cut the plug off, or it's hidden under the UIM now. If all else fails, you can run a new wire directly from the ECU, through the firewall & to the 02 sensor.

young Dizzy

well i think if i unpluged it i would know where its at thanks,, but i found out that he cut it so i ran it to the ecu