High idle - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 17 (permalink) Old 02-14-2017, 08:05 PM Thread Starter
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High idle

I am currently having these problems with my 2001 taurus 3.0 liter dohc duratec.Car jerks when shifting from park to reverse and park to drive. Idles high at around 2000 rpms. On a level surface at 40 mph I'll let off the gas and and the stays at 40 until I hit the brakes. When I accelerate from a stop to 5mph and let off the gas the car keeps accelerating to 20 mph and the rpms are at 2000. I just put a new IAC in today and recently fixed my front passenger cv axle. Can anyone help please and thanks in advance
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post #2 of 17 (permalink) Old 02-14-2017, 08:39 PM
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Originally Posted by Dakotasmith23 View Post
I am currently having these problems with my 2001 taurus 3.0 liter dohc duratec.Car jerks when shifting from park to reverse and park to drive. Idles high at around 2000 rpms. On a level surface at 40 mph I'll let off the gas and and the stays at 40 until I hit the brakes. When I accelerate from a stop to 5mph and let off the gas the car keeps accelerating to 20 mph and the rpms are at 2000. I just put a new IAC in today and recently fixed my front passenger cv axle. Can anyone help please and thanks in advance
Your PCV must be Motorcraft. Cheap aftermarket let too much air through and they idle fast. Idle speed is managed by the air entering the intake manifold. The IAC is managed by the PCM, the other normal air is passed by the PCV which is just mechanical. My '03 DOHC stuck closed and I got really slow idle. I rushed out to get the parts house one and then I idled about 35-40 on level ground. MC fixed it and it is perfect since. Vacuum leaks will also make for fast idle as they are unplanned source of air. The PCV is way too much effort for anything but the correct part.

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post #3 of 17 (permalink) Old 02-14-2017, 08:42 PM
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Two issues I can think of. The high idle could be cased by a problem with the cruise control cable link.. They some times pop off and won't let the throttle plate to close. Other could be a bad IAC valve if it isn't a Motorcraft brand one. Aftermarkets just don't work well with the engine, I have been there and done that.
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post #4 of 17 (permalink) Old 02-14-2017, 10:25 PM
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Do you have a CEL on?

John
2001 Sable LS Premium Wagon Duratec, 193K miles and kicking, 99 Durango 318, 2013 Hyundai Sonata GLS
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post #5 of 17 (permalink) Old 02-15-2017, 10:36 AM Thread Starter
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P1506 is the only code that shows up
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post #6 of 17 (permalink) Old 02-15-2017, 10:59 AM
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Originally Posted by Dakotasmith23 View Post
P1506 is the only code that shows up
  • Faulty Idle Air Control (IAC) valve
  • IAC valve harness is open or shorted
  • IAC valve circuit poor electrical connection
  • Intake leaks
  • Stuck PCV Valve
So, put any code in any search engine and read on.

Above list: copy and paste: Not mine.

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post #7 of 17 (permalink) Old 02-15-2017, 11:01 AM
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P1506= iac overspeed error. Is the new iac Motorcraft?
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post #8 of 17 (permalink) Old 02-15-2017, 02:59 PM Thread Starter
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No it is a duralast. Also I didn't find any vacuum leaks. So could it be anything besides that
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post #9 of 17 (permalink) Old 02-15-2017, 03:06 PM
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Important to use Motorcraft iac/pcv valve. May grab a jy iac from an '01 tec and clean/lube to try before buying a new one. I'd try to return the Autozone iac. May also check Rockauto online. Aftermarket iac tend to cause high idle. Edit: MC iac from Rockauto runs $71.99. MC pcv valve from Rockauto runs $11.12.
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Last edited by sheila; 02-15-2017 at 03:24 PM.
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post #10 of 17 (permalink) Old 02-15-2017, 03:28 PM Thread Starter
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Thank you I will definitely look into that. What about when the car jerks when I shift gears
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