no
I believe it is the black wire coming from stock o2 sensor. I have tested this wire with votmeter and have seen voltage fluctuation from 200 mv - 900mv. I think this is correct.
An oxygen meter measures the percentage of oxygen in the air being tested.
Take a test tube and put inside it a glowing splint. If the splint relights, the oxygen is present. If not, there is no oxygen.
The O2 (Oxygen Sensor) has nothing to do with the engine not starting. If it will not start you either have no spark or no fuel. If the engine will not turn over, it is either the starter, battery, connections, ignition switch, or starter solenoid. Some starters have the solenoid built into the starter. Test the battery, and all connections. Remove the starter and have it tested at any auto parts store.
The throttle position sensor can be tested by moving the throttle as observing the engine's response. If it is smooth and consistent, the sensor is functioning properly.
Oximetry.
Back probe both wires of the sensor and use an AC voltage setting or your readings will be bad
I would say you have to check your coil packs, and ignition module to see if they are firing on all cylinders, and have the correct spark. Anything but a bright blue spark means a weak coil. The ignition module can be tested at some parts stores.
A faulty EGR valve can cause a 98 Chevy to fail a smog test. The oxygen sensors should also be tested as they can also cause a 98 Chevy to fail a smog test.
personally it sounds like the oxygen sensor had its day
because most combustible gas meters are oxygen dependent and will not provide reliable readings in an oxygen deficient atmosphere .. balls
yes but the cam sensor and the crank sensor work to geather so make sure to have it tested if you can to make sure wich is bad .