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Old 01-15-2012, 09:45 PM   #1
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O2 sensor

Will an o2 sensor cause a ruff idle? I jumped my car today it ran great, reved normal, then about 5 min later it dropped rpms and ran like crap would not respond to throttle, and hard to get it to rev over 2000 rpm. Wanted to know if bad o2 sensors could cause this. If not what should i look into.
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Old 01-15-2012, 09:48 PM   #2
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possibly but it would most likely throw a code.
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Old 01-15-2012, 09:57 PM   #3
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Re: O2 sensor

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Originally Posted by dreamstang View Post
possibly but it would most likely throw a code.
^ Well said.
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Old 01-15-2012, 10:07 PM   #4
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You can get dummy sensors if they are legal in your state it just makes your car run Rich a little
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Old 01-15-2012, 10:44 PM   #5
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Re: O2 sensor

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Originally Posted by Matt5.0 View Post
Will an o2 sensor cause a ruff idle? I jumped my car today it ran great, reved normal, then about 5 min later it dropped rpms and ran like crap would not respond to throttle, and hard to get it to rev over 2000 rpm. Wanted to know if bad o2 sensors could cause this. If not what should i look into.
Possible like dreamstang said.
They send signals to your ECU to help it determine the proper air/fuel ratio.
If they are not working properly the engine can run too rich which will eventually wash down the cylinder walls enough to damage or destroy your engine.


Your description sounds more like a possible timing or fuel supply issue.
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Old 01-15-2012, 11:08 PM   #6
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I canged out the fuel filter 3000 miles age, and fuel pressure regulator yesterday. Dou you think i should do the fuel pump?
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Old 01-15-2012, 11:24 PM   #7
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U need to test the fuel pressure to see if that's your problem.
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Old 01-15-2012, 11:25 PM   #8
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Re: O2 sensor

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I canged out the fuel filter 3000 miles age, and fuel pressure regulator yesterday. Dou you think i should do the fuel pump?
Possibly.
Do a fuel pressure check and see where it is and how it reacts with the engine at idle and when you give it some gas.
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