Rough idle - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 49 (permalink) Old 10-03-2010, 01:34 PM Thread Starter
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Rough idle

I noticed my 2006 3.0 Taurus has a fluctuating idle while waiting at stop lights. At night, I can see the headlights flicker. Any ideas?
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post #2 of 49 (permalink) Old 10-04-2010, 08:57 PM
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Have the plugs been replaced?

You may have a poor ground connection,
the flicker lights is one symptom.

Check the battery terminals for corrosion.
Easy to remove the cable clamps and clean the
terminals with inexpensive tool.

Is the Check Engine indicator on?
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post #3 of 49 (permalink) Old 10-05-2010, 09:51 PM
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i think the flickering lights is just because of the rough idle, could be getting too low of an idle and makes the alt not charge as much and makes the lights dim.
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post #4 of 49 (permalink) Old 10-06-2010, 02:39 PM
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Be sure to check for DTC's and also check your alternators voltage and amp output.
If your idle speed is ok, but the headlights are flickering (you can notice it on the back of the vehicle in front of you at night), chances are good that you either have a ground/connection/battery issue, or that your alternator is bad. I had the same issue, and a new alternator solved the problem. I suggest one from a Ford dealer.
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post #5 of 49 (permalink) Old 10-06-2010, 04:22 PM
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How big is the fluctuation? My car fluctuates maybe 100 rpm when just sitting idling, it needs one of the o2 sensors replaced..
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post #6 of 49 (permalink) Old 10-07-2010, 10:24 AM
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Check for a vac leak around the gasket for the intake runner control valve gasket.

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post #7 of 49 (permalink) Old 10-07-2010, 10:35 AM
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post #8 of 49 (permalink) Old 10-07-2010, 01:33 PM
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The IAT sensor might be bad.

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post #9 of 49 (permalink) Old 11-05-2010, 09:53 PM
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I have exact same problem. I have replaced the Mass Airflow sensor, alternator, plugs, wires, idle air valve, coil pack and it still persists. I can't tell if the lights are dimming because the engine is dropping below 700 rpm or an intermittent electrical draw is putting additional load on the engine at idle (like when you switch the rear defrost on, or the heater motor) causing it to have to compensate..


The flickering coincides with the rough idle.. (when there is no flickering, idle is smooth) It is also completely ransom.. Like it will flicker 20 times in 10 seconds or will flicker 1 time in a minute. It seems like something is putting additional load on my engine through the alternator (grounding out)..

I have spent hours and hours on this problem, as well as many hundreds of dollars. Can someone PLEASE help?
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post #10 of 49 (permalink) Old 11-05-2010, 11:10 PM
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Quote:
Originally Posted by newtrawn View Post
I have exact same problem. I have replaced the Mass Airflow sensor, alternator, plugs, wires, idle air valve, coil pack and it still persists. I can't tell if the lights are dimming because the engine is dropping below 700 rpm or an intermittent electrical draw is putting additional load on the engine at idle (like when you switch the rear defrost on, or the heater motor) causing it to have to compensate..


The flickering coincides with the rough idle.. (when there is no flickering, idle is smooth) It is also completely ransom.. Like it will flicker 20 times in 10 seconds or will flicker 1 time in a minute. It seems like something is putting additional load on my engine through the alternator (grounding out)..

I have spent hours and hours on this problem, as well as many hundreds of dollars. Can someone PLEASE help?
I've been living with this problem since I bought mine in '07, 2 dealers said they couldn't find anything wrong with mine, soon after I bought it. I test drove 3 other Vulcan Taurus, from the same year, and they all did the same thing mine does. I guess most of them do this, even I can't find anything wrong with mine, and I have a code scanner with live data, no codes, nothing to suggest vac leaks, or bad sensors. On some days, mine will idle as smooth as a Honda, on others, the idle is as unstable as a tweaker on ice. New plugs and wires at 96k didn't do anything.
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