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Old 08-21-2006, 09:40 PM   #1
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Could a bad oxygen sensor cause a rough idle

after going into closed loop. 89 TPI.

Car idles normally until it warms up enough to go into closed loop. I searched and found little info. Thx

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Old 08-22-2006, 08:02 AM   #2
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The short answer to your question is yes. If the O2 is bad and reading lean all the time the ECM will richen the A/F mixture, causing a rich condition, in turn causing a rough idle. If the sensor has'nt been replaced in a while, go ahead and replace it.
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Old 08-22-2006, 12:31 PM   #3
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Even with no codes ?
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Old 08-22-2006, 12:36 PM   #4
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If the sensor is still putting out a mV signal a code won't be thrown for the O2 sensor. I'm not sure what triggers the ECM to throw a lean or rich code though.
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Old 08-22-2006, 12:41 PM   #5
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Thx
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Old 08-22-2006, 11:16 PM   #6
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Quote:
Originally Posted by 8492bird View Post
The short answer to your question is yes. If the O2 is bad and reading lean all the time the ECM will richen the A/F mixture, causing a rich condition, in turn causing a rough idle. If the sensor has'nt been replaced in a while, go ahead and replace it.
from my understanding the o2 doesn't work all that well at idle speeds so at idle itself more or less it gets ignored until you apply a little throttle. at least with most every car I have seen it's about right. just like the O2 also gets ignored more often then not at WOT.

if you don't mind just out of curiousity is there a chance to disconnect the O2 while your car is warming up see if it runs ok afterwords.

I'm fairly sure it would still run ok but honestly I'm not 100%
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Old 08-22-2006, 11:16 PM
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