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Re: Failed Oxygen Sensor or ECU? 200 80

posted by  someone claiming to be abe on  Sun Nov 12 11:47 CST 2000 [RELATED]

The thermal switch that sets duty cycle to a fixed stting until warm

(120 F +/-) isn't used on 4's in '80 (it was used on 6's in '80).

The next thing to check would be the O2 sensor circuit into ECU. There should be .5 V on the sensor lead when the O2 sensor is unplugged. If not then go inside and check the lambda control unit plug for corrosion.

It wouldn't be a bad idea to clean the grounds on side of intake for the lambda system. These shouldn't be on the same bolt according to an ancient service bulletin.





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