Like it's said, the ECU determines the fuel mixture, the 02 sensor senses a slightly rich (not enough 02) or slightly lean, with the threshold around .6 volts, the sensor will cycle the fuel "trim" up to a dozen times a second. As sensors age they become "lazy" and many will only cycle a couple times a second. Coatings build up with mileage and that's the reason they should be replaced around that 75,000 mile point. A sensor can foul itself quite quickly with an upstream exhaust leak, for example, or restricted cat. The basic reason newer vehicles have multiple O2 sensors, 1 right before and 1 after the cat. The ecu will tell you with a code if the cat is not functioning. If you measure the cycling time of the sensor with a scan tool, it tells you what it's doing. Larry
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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