philipk65

Is there and easy test to see if the oxygen sensor is working properly on a '91 S-10 4.3 L?

Thanks!

TomB985

Good question.

A good rule of thumb is replace it every 50,000 miles or so...helps with fuel economy and driveability.

MT-2500

A voltmeter or a scanner.
Should have switching under and over .5 volts
The voltage long range is around .1 volt to .9 volts on a 02 sensor.
And watch the switching time.
Run engine full rich and see if it goes high.
Create a vacuum leak and se if it goes low.

__________________
Remember proper testing gives us the answer to many problems.
MT

philipk65

If the O2 sensor had any problems with it, wouldn't it trip the "check engine" light?

aikiwaza

I think MT-2500 has the right idea... that would be the way I would do it too.

A bad O2 sensor doesn't always trip the light. I believe that the car system gives it two minutes to read correctly and if it doesn't then it trips the light. An exception is if the car generally stays in range, but goes out of range and back in before the one or two minute mark. This is enough to give a rough ride but not turn on the light.

philipk65

MT-2500,

What is meant by "switiching times" on th O2 sensor? What should it be?

Also, how do I create a rich mixture to check and is if it goes high?

THANKS!

MT-2500

Switching time is the time it takes a 02 sensor to swith voltage.
The older the get the slower the get.

__________________
Remember proper testing gives us the answer to many problems.
MT

philipk65

MT-2500, What should the time intervals be between switching voltage?

How do I create a rich mixture for checking the 02 sensor hgh reading?