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Old 07-09-2006, 02:29 PM   #1
beasticeman
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Question oxygen censer problem

i have a 1996 SC2 and all i would like to know is. How i can tell if my Oxygen censer is bad. and if it is bad can it cause stalling or spottering. Wat does it cause?
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Old 07-09-2006, 03:32 PM   #2
M.Nguyen
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Default Re: oxygen censer problem

If it's bad, you'll get a service engine soon light.

And it can cause sputtering, and stalling, yes.

It can also cause bad gasmileage, poor fuel economy, slow accelerationg, loopy idle, and tons of other stuff.
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Old 07-09-2006, 06:22 PM   #3
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Default Re: oxygen censer problem

One rednecky way is to unplug it and throw your car into open loop mode. If it improves how it runs that generally (but not specifically) indicates your o2 sensor as having issues. You WILL throw a code when you do this but the code should go away after you plug it back in.

A better way is to plug a scan computer in and see how quickly its voltage varies. Actually you might be able to do this with a digital voltmeter, should swing between .1 and .9 volts. Only thing is most digital voltmeters update their displays twice a second and the o2 can swing faster than that.

Stalling and sputtering can be anything, of course... a symptom as specific as a sniffle or headache which could be caused by 100 things.
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Old 07-09-2006, 09:38 PM   #4
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Default Re: oxygen censer problem

Quote:
Originally Posted by beasticeman
Oxygen censer
It's actually an oxygen sensor.
Don't get upset at me-it's constructive criticism (I spell things wrong all the time too-if people point it out-I can learn from my mistakes).
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Old 07-09-2006, 09:42 PM   #5
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Default Re: oxygen censer problem

Quote:
Originally Posted by beasticeman
i have a 1996 SC2 and all i would like to know is. How i can tell if my Oxygen censer is bad. and if it is bad can it cause stalling or spottering. Wat does it cause?
If one or both of them are bad, you would get a "Service Engine Soon" light and a code would be stored in the PCM. Having a bad front oxygen sensor could cause drivable problems. a bad rear heated oxygen sensor would just make the light come on but not effect fuel control.
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Old 07-10-2006, 04:49 AM   #6
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Default Re: oxygen censer problem

if an o2 swings slowly it can cause noticeable drivability issues but might not light a CEL until it completely dies. Rather like the CTS failure mode, if it generates believable info to the computer.
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Old 12-05-2006, 03:48 AM   #7
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Default Re: oxygen censer problem

Quote:
Originally Posted by eljefino View Post
One rednecky way is to unplug it and throw your car into open loop mode. If it improves how it runs that generally (but not specifically) indicates your o2 sensor as having issues. You WILL throw a code when you do this but the code should go away after you plug it back in.
Does unplugging the sensor throw it into open loop mode automatically or is this something you have to "do"?
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Old 12-05-2006, 01:35 PM   #8
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Default Re: oxygen censer problem

Open loop will be automatic, as the (front) oxygen sensor is the only thing that "sees" how rich/lean things are after combustion. In fact every time you start the car it runs in open loop until it warms up enough for the sensor to start sending data. If it doesn't eventually wind up with good o2 data it'll throw a code but keep trucking along in open loop.
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Old 12-05-2006, 03:38 PM   #9
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Default Re: oxygen censer problem

So technically, if my O2 sensor was bad, then I could get a 1/4 mile time with my O2 sensor connected and one without and compare? If it's slower with the O2 sensor connected, then time for a new one?
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Old 12-05-2006, 04:40 PM   #10
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Default Re: oxygen censer problem

You can check them with a volt meter, but it can't be no dimestore special or Harbor Freight volt meter. I'm lucky enough to have a very nice Fluke 179 that I can test with but Fluke meters are expensive. Mine cost almost $300. An even better test tool would be to use an oscilloscope. You can literally see the voltage swing and measure it more precisely.
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