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Old 05-02-2008, 10:37 AM   #1 (permalink)
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Could some body please tell me where the oxegen sensors are located and how to replace then on a 2003 Taurus SES with the flex fuel engine. My car is jerking and bucking under acceleration "sometimes" and I have run through a couple of cans of injector cleaner as well as dry gas and have now just replaced the fuel filter but still have the problem and someone said that's what I needed to do next......
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Old 05-02-2008, 10:48 AM   #2 (permalink)
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That's DEFINITELY not oxygen sensors.

The Oxygen (O2) sensors control the air fuel ratio (upstream sensors) and monitor catalyst efficiency (downstream sensors). The upstream sensors are located on the exhaust manifolds, before the catalytic converters, and the downstream sensors are located on the y-pipe, after the cats. They would have no effect on the idle or cause bucking.

You should be looking at the mass airflow sensor, throttle body, and IAC.

JR
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Old 05-02-2008, 10:52 AM   #3 (permalink)
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O2 sensors would be the last on the list I would check for.

I'd start out with Godspunk's list and add spark plugs on there.
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Old 05-02-2008, 06:23 PM   #4 (permalink)
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Thank You JR I Sincerly soooo much for your advice. If it was you which of the three things that you mentioned would you try first, then second and then third ?..... and do you think maybe new plugs and wires might help if I can get to the back ones. You know through all of this my "check engine light still has not come on even one time yet... lol... now that I've said it thopugh well see.............thanks, Doug

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That's DEFINITELY not oxygen sensors.

The Oxygen (O2) sensors control the air fuel ratio (upstream sensors) and monitor catalyst efficiency (downstream sensors). The upstream sensors are located on the exhaust manifolds, before the catalytic converters, and the downstream sensors are located on the y-pipe, after the cats. They would have no effect on the idle or cause bucking.

You should be looking at the mass airflow sensor, throttle body, and IAC.

JR
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Old 05-02-2008, 09:15 PM   #5 (permalink)
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The first thing I'd do is pull your spark plugs, take a picture of them, and post the picture here. Based on the color and characteristics of the isolators, we can have a better idea of what your engine is actually doing; running rich, lean, misfiring, flooding the cylinder, whatever. The second thing I'd do is check to make sure the plug wires are on the correct plugs, and in the correct order. After that, I'd clean the mass airflow sensor with some MAF sensor cleaner, then check the IAC and make sure the throttle body is moving cleanly.

JR
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Old 05-02-2008, 09:41 PM   #6 (permalink)
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Quote:
Could some body please tell me where the oxegen sensors are located and how to replace then on a 2003 Taurus SES with the flex fuel engine. My car is jerking and bucking under acceleration "sometimes" and I have run through a couple of cans of injector cleaner as well as dry gas and have now just replaced the fuel filter but still have the problem and someone said that's what I needed to do next......
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Even if the CEL hasn't turned on I'd still scan for codes, chances are there might be some stored in memory, ones that don't trigger the light to turn on. Post them here.
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Old 05-03-2008, 04:05 AM   #7 (permalink)
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Quote:
Could some body please tell me where the oxegen sensors are located and how to replace then on a 2003 Taurus SES with the flex fuel engine. My car is jerking and bucking under acceleration "sometimes" and I have run through a couple of cans of injector cleaner as well as dry gas and have now just replaced the fuel filter but still have the problem and someone said that's what I needed to do next......
[/b]
Failing 02s will feel more like stalling or even a lack of acceleration....not jerking like an old man with a heart attack..
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Old 05-03-2008, 07:29 AM   #8 (permalink)
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Absolutely wrong.

Failing O2 sensors (upstream) will throw a code for an improper air/fuel ratio, and the car might run rich or lean. Failed downstream sensors won't do anything other than throw a code. There will be no stalling unless there are other issues.

JR
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Old 05-03-2008, 07:41 AM   #9 (permalink)
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Tell us how many miles and we can start telling you things that usually need maintenance in the mileage range.

Mike
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Old 05-03-2008, 01:58 PM   #10 (permalink)
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93426 Miles Mike and Thanks for responding. I'm beggining to think I need to find a Auto Exocist...LOL It's funny some times under acceleration it jerks and buck like a brama bull and not once yet has my service engine light come on yet. I am a novice at all this but did manage with ya'alls help to change the fuel filter but I went out and looked at me replacing the plug and wires with new ones and not sure if I can get to those back three ??????????? ....... If I do should I put in platnum or Iridium plugs and are Bosch wires good or should I use something else ?
Thanks Again.
Doug


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Tell us how many miles and we can start telling you things that usually need maintenance in the mileage range.

Mike

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