New IAC Valve causes cold idle problems: High RPM, Stalling, Slow Deceleration - Taurus Car Club of America : Ford Taurus Forum

canaws · 02-11-2013, 08:59 PM

I have a 2002 Taurus w/ a Vulcan Fuel Flex Engine, SOHV.

My car has had rough idling problems for quite a while, so I thought it might help to look for vacuum leaks, change the IAC valve, and clean the MAF sensor.

I went for the IAC valve first. I bought this one (BWD 21067 from O'Reilly). After putting it on I noticed that the car was having trouble when trying to stop. When I pushed the break it would surge when getting closed to stopping before finally stopping. If I am going 35/40+ I can hear it sort of over rev up and it seems to hesitate slowing down when I first push the break. Also, on a cold morning when I put the car in park the RPMs revved high, stayed high, and the engine cut off when trying to park. It started back up fine though.

I thought it might be a bad part, so I exchanged it. The new one hasn't caused the car to cut off, but it's still having the same problems and it seems to be worse (if not only) when it's cold. At this point I'm probably just going to stick my old one back on and see if that solves it.

Any idea what would cause this?

behlinla · 02-11-2013, 09:36 PM

Did you look for vacuum leaks yet? Did you install a gasket with the new IAC? The gasket must the same type as the original to function correctly.

When you got the IAC, did you confirm it was the correct part number and looked exactly the same as the old one?

jwagers1984 · 02-15-2013, 02:20 AM

I am having this problem too. Correct part, came with correct gasket. I am wondering if I loosened something while I changed the IAC valve? Threw a code that the IAC valve was still causing problems. Ugh...also going to check for any other vaccume leaks.
Also, going to replace the PCV valve. I have read in several places that a disfunctional PCV valve can send IAC valve problem codes.

noluck4 · 02-16-2013, 12:37 PM

I wonder if this has been solved yet. Did you disconnect the battery and allow for the car to relearn idle? There is a very good fast write up here. http://www.taurusclub.com/forum/1358165-post4.html

Assuming that you did, I would check the PCV and if that don't help-clean the throttle body and check the cables. And check for vacuume leaks.

02-11-2013, 08:59 PM	#1 (permalink)
canaws Junior Member Member Number: 18476 Join Date: Mar 2009 Visit: My Garage Posts: 4 Trader Score: 0 reviews Rep Power: 0	New IAC Valve causes cold idle problems: High RPM, Stalling, Slow Deceleration I have a 2002 Taurus w/ a Vulcan Fuel Flex Engine, SOHV. My car has had rough idling problems for quite a while, so I thought it might help to look for vacuum leaks, change the IAC valve, and clean the MAF sensor. I went for the IAC valve first. I bought this one (BWD 21067 from O'Reilly). After putting it on I noticed that the car was having trouble when trying to stop. When I pushed the break it would surge when getting closed to stopping before finally stopping. If I am going 35/40+ I can hear it sort of over rev up and it seems to hesitate slowing down when I first push the break. Also, on a cold morning when I put the car in park the RPMs revved high, stayed high, and the engine cut off when trying to park. It started back up fine though. I thought it might be a bad part, so I exchanged it. The new one hasn't caused the car to cut off, but it's still having the same problems and it seems to be worse (if not only) when it's cold. At this point I'm probably just going to stick my old one back on and see if that solves it. Any idea what would cause this?

02-15-2013, 02:20 AM	#3 (permalink)
jwagers1984 Junior Member Member Number: 52723 Join Date: Feb 2013 Location: Ocala, FL Chapter: Southeast Drives: 2001 3.0 V6 SEL Visit: My Garage Posts: 6 Trader Score: 0 reviews Rep Power: 0	I am having this problem too. Correct part, came with correct gasket. I am wondering if I loosened something while I changed the IAC valve? Threw a code that the IAC valve was still causing problems. Ugh...also going to check for any other vaccume leaks. Also, going to replace the PCV valve. I have read in several places that a disfunctional PCV valve can send IAC valve problem codes. Last edited by jwagers1984; 02-15-2013 at 02:38 AM.

02-11-2013, 09:36 PM	#2 (permalink)
behlinla Technical Advisor Member Number: 14275 Join Date: Dec 2007 Location: Wisconsin Chapter: Midwest Drives: 2006 Taurus SEL Visit: My Garage Posts: 5,637 Trader Score: 0 reviews Rep Power: 10	Did you look for vacuum leaks yet? Did you install a gasket with the new IAC? The gasket must the same type as the original to function correctly. When you got the IAC, did you confirm it was the correct part number and looked exactly the same as the old one?

02-16-2013, 12:37 PM	#4 (permalink)
noluck4 Member Member Number: 49635 Join Date: Aug 2012 Chapter: Midwest Drives: 2003 Ford Taurus, 3.0L V6 Visit: My Garage Posts: 108 Trader Score: 0 reviews Rep Power: 1	I wonder if this has been solved yet. Did you disconnect the battery and allow for the car to relearn idle? There is a very good fast write up here. http://www.taurusclub.com/forum/1358165-post4.html Assuming that you did, I would check the PCV and if that don't help-clean the throttle body and check the cables. And check for vacuume leaks.

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