Chilton's manual states the following:
- Start engine and bring to normal operating temp, then run engine above
- Backprobe w/ a high impedence averaging voltmeter between the oxygen sensor and battery ground.
- Verfiy that the O2 sensor voltage is stablized at the middle of the especified range.
There are more steps. My question is what is "backprobe" and exactly how do I do it? I know how to use a voltmeter (sorta) but I never heard the term "backprobe". Note: I noticed 4 wires going to/from the O2 sensor. Colors were white, blue and 2 black wires. Not sure if I use these to backprobe.
TIA Darin