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Give us some engine information, also do you have a dvom? if you do I will talk you through a test to check the O2 sensor to see if its is working properly.
sorry, wasnt thinking about the engine info. Its the 2.0l DOHC Beta 2 engine with MFI fuel injection. It does not have any sort of variable valve timing in case you need to know. I don’t know what else you need to know but i can try and get whatever other info you need and yes I have a dvom.
ok here we go. first locate the O2 sensor in Question, follow the electrical leads back to a connector that you can access easily. the sensor may have three or four wires going to it. if it does only one of the wires is the signal wire. ( may have to look in a wiring diagram to determine which wire is the signal wire). once you have located the signal wire, take your dvom and turn it to the lowest reading for DC volts that will still give you a reading of at least one volt. take the ground lead and attached it to a good ground, take the positive lead and back probe the sensor signal at the connector. once this step is completed, and you are sure you are on the sensor signal wire, start your engine. allow the engine to warm up, and observe the readout on the meter. you should be seeing the voltage switching from ,1volt to .9 volt this is reallly 1000mv-900mv..anyway the treshold voltage you want to observe is to besure it is switching above and below .5v or 500mv. if it isn’t then a problem exist. but before throwing a new part at it you may not need, lets do two more test if the first test warrents it.
First if the voltage is staying above .5mv introduce a small vacumm leak into the engine and see if the reading responds by going down belowe .5mv.if it doesn’t, the sensor may not be able to recognize a lean condition.
second if the sensor is remaining below .5mv try attaching a small tube to a propane bottle and add a little propane to the engine and see if it goes above .5mv. if it don’t then the sensor may be unable to recognize a rich condition. BE CAREFUL WHEN USING THE PORPANE. if it fails one of these test then you would need to look at what would cause it to run rich or lean. if you can’t find anything to cause the test to fail then replace the sensor.
Keep posting and good luck.
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