- Location
- South San Francisco, CA
To start: 1990 Renix, 5 speed, 4:56 gears, 33 inch tires, new cat and exhaust manifold. O2 sensor is two years old. All grounds have been refreshed.
Had to smog it this year and ended up failing with these numbers:
Looks like its running rich, so I pulled the fuel rail to check for a leaking injector. No leaks. Checked the O2 sensor next and found that it's not receiving 12 volts on the orange lead but is getting 5 volts from the ECM. I checked the sensor with the engine running and at idle, it read a steady 5 volts, only swinging to two volts once. I'm going to replace it and try to figure out where I'm losing the 12 volt feed from.
Where does the 12 volt source originate from? If I need to run another wire to bring 12 volts to the sensor, where word the best source be?
Had to smog it this year and ended up failing with these numbers:
Looks like its running rich, so I pulled the fuel rail to check for a leaking injector. No leaks. Checked the O2 sensor next and found that it's not receiving 12 volts on the orange lead but is getting 5 volts from the ECM. I checked the sensor with the engine running and at idle, it read a steady 5 volts, only swinging to two volts once. I'm going to replace it and try to figure out where I'm losing the 12 volt feed from.
Where does the 12 volt source originate from? If I need to run another wire to bring 12 volts to the sensor, where word the best source be?