Counterounter Point

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WHAT S INSIDE:WHAT S INSIDE:Making Sense of Oxygen 1 / Counter Point Celebrates Its First 1 / FINE 2 /QUALITY points : WELLS Premium Spark Plug Wire 3 / HOT OFF THE WIRE: Isolation Diagnostic 4 / Publisher s 4Making Sense OfOxygen SensorsCounterCounterPointTHE ELECTRONIC, DIAGNOSTIC AND DRIVEABILITY 2 Issue 3, September 1998Volume 2 Issue 3, September 1998Today s computerized engine control systems rely on input from a variety of sensors to regulate engine performance, emissions and other important O2 sensor failure or a problem in the sensor swiring circuit will prevent the system from going intoclosed loop causing a rich-fuel condition, increasedemissions (particularly carbon monoxide) and fuelconsumption. Keep in mind that a bad coolanttemperature sensor can also prevent the system fromgoing into closed THE O2 SENSOR WORKSThe O2 sensor used in most vehicles is a voltagegenerating sensor.

2 Q: “We have a 1988 Pontiac LeMans that is hard to start during rainy, damp weather. Replaced the spark plugs and plug wires which help somewhat, but

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