Why do you guys need oxygen sensors and we don't ? (4 Viewers)

[GCCFZJ]

The blue and red runs are after I fixed two burnt valves. It's a 95 GCC spec so no O2 sensors.....AFR's landed where they should be.

 

[MissahPapaJ]

Correct, there are different ECU’s for countries that don’t require the OBDII emissions controls. For 1FZ’s in those areas the O2 sensors help the truck adjust fueling so that it isn’t too lean or too rich.

For countries without OBDII, the 1FZ just runs off of the fuel and load tables, in the ECU. I am sure it runs fairly rich since that is safe. Oddly though the O2 sensors can catch problems like a failing injector, intake air leak, etc. I am kind of surprised Toyota just didn’t use them on all the 1FZ’s. I guess they save some money not using them.

For a truck like yours, I would definitely add an aftermarket wideband O2 sensor in the exhaust.

Could be wrong but I think in some country’s 80 series also had carburetors too. Could be wrong, I do drink late nights and think I read stuff. I have a feeling having a bare knuckles Toyota in another country likely makes you middle class