Oxygen Sensor :/ (1 Viewer)

[AnarchyNgine]

Hi fellas.
Been having trouble with my '93 fzj80.
Got a really strong fuel smell coming from the exhaust so I figured I'd check all of the sensors.
They are all okay, except for the o2 sensor, which holds around .35 volts on the sensor wire, and doesn't fluctuate as it should.
Previously I'd added an earth strap to the grey wire (ox+), because the car would barely run without it.
I'm not sure why I had to do this because the ox+ works as an earth, although it seems to work better with the earth strap on. By that I mean, with a multimeter, using ox+ as an earth and testing with a 12v cable, I get higher voltage with the earth strap on.
Does anyone know if the Ecu supplies an intermittent earth to this cable thus receiving the intermittent signal back?
Or does the o2 sensor create the intermittent signal with a constant input earth?
Any help would be appreciated.
Cheers

 

[landtoy80]

Know nothing about ground or earth straps.
Its common for there to be corrosion in the plug connectors. That will cause issues.
Look for bare wires too.

You can unplug the O2's and drive without them. I have many thousands of miles with them unplugged on my 94.

The O2's often get fouled out even more so if you use diesel motor oil with higher levels of zinc/ZDDP.

Driving conditions affect my O2's. If I drive all city miles, I get 25 and or 26 (rich lean) codes. After all why miles driving for a tank or more of gas the codes and check engine light go away.

I have no idea if fouled O2's has any affect on your issue or react to ground or earth straps.

 

[AnarchyNgine]

Know nothing about ground or earth straps.
Its common for there to be corrosion in the plug connectors. That will cause issues.
Look for bare wires too.

You can unplug the O2's and drive without them. I have many thousands of miles with them unplugged on my 94.

The O2's often get fouled out even more so if you use diesel motor oil with higher levels of zinc/ZDDP.

Driving conditions affect my O2's. If I drive all city miles, I get 25 and or 26 (rich lean) codes. After all why miles driving for a tank or more of gas the codes and check engine light go away.

I have no idea if fouled O2's has any affect on your issue or react to ground or earth straps.

Thanks for your reply.
I've tried 2 aftermarket sensors and a second hand Toyota one, and they all do the same thing.
All of the wiring diagrams show that the sensor earth runs to e1 on the Ecu, but mine runs to ox+, which seems right.
I might have to check my wiring to the ecu I think.

 

[landtoy80]

Many here have had bad luck with aftermarket O2's.

My 80 always smells rich with fuel.