New IAC Valve causes cold idle problems: High RPM, Stalling, Slow Deceleration - Taurus Car Club of America : Ford Taurus Forum
Closed Thread
 
LinkBack Thread Tools
post #1 of 11 (permalink) Old 02-11-2013, 09:59 PM Thread Starter
Junior Member
 
Join Date: Mar 2009
Posts: 17
Rep Power: 0
 
Trader Score: 0 reviews
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?
canaws is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 02-11-2013, 10:36 PM
Technical Advisor
 
behlinla's Avatar
 
Join Date: Dec 2007
Location: Wisconsin
Chapter: Midwest
Posts: 7,539
Rep Power: 85
      
Trader Score: 0 reviews
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?
behlinla is offline  
post #3 of 11 (permalink) Old 02-15-2013, 03:20 AM
Junior Member
 
Join Date: Feb 2013
Location: Ocala, FL
Chapter: Southeast
Posts: 6
Rep Power: 0
 
Trader Score: 0 reviews
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 03:38 AM.
jwagers1984 is offline  
post #4 of 11 (permalink) Old 02-16-2013, 01:37 PM
Member
 
noluck4's Avatar
 
Join Date: Aug 2012
Chapter: Midwest
Posts: 482
Rep Power: 0
 
Trader Score: 0 reviews
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. Can Someone Tell Me How To Reset My Check Engine Light?

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.
noluck4 is offline  
post #5 of 11 (permalink) Old 09-14-2013, 08:51 PM Thread Starter
Junior Member
 
Join Date: Mar 2009
Posts: 17
Rep Power: 0
 
Trader Score: 0 reviews
I don't like to leave posts unsolved if I can help it (for future googlers). In the end, I end up putting my old one back on and that worked out fine. I was just trying to change it as a preventative measure anyway. Either I got two bad parts in a row or that part is not really meant for the Taurus, no matter what it says.
canaws is offline  
post #6 of 11 (permalink) Old 09-14-2013, 09:01 PM
Play Nice or Don't Play

 
jag1959's Avatar
 
Join Date: Jun 2013
Chapter: Northeast
Year: 1998
Model: Ford Taurus SHO
Engine: 3.4L Yamaha V8
Posts: 12,986
Rep Power: 107
       
Trader Score: 0 reviews
Wow 7 months later, but never too late . Thanks for making the thread useful. The after market IAC's have become a known issue. There may be a dozen threads about it on this forum alone. I went through a couple under warranty before I went Motorcraft. Are you sure you didn't update so you wouldn't get jobbed when you started a new thread?

Ignition Stuck On

Last edited by jag1959; 09-14-2013 at 09:04 PM.
jag1959 is offline  
post #7 of 11 (permalink) Old 09-14-2013, 09:17 PM Thread Starter
Junior Member
 
Join Date: Mar 2009
Posts: 17
Rep Power: 0
 
Trader Score: 0 reviews
Naw! I figure better late than never. Whenever I make a new post on a help board I try to check up on my old posts to make sure I updated it with whatever solution I went with. There's nothing worse than finding a post online with your exact problem and then never figuring out what happened! It's torture.
canaws is offline  
post #8 of 11 (permalink) Old 11-14-2013, 11:25 AM
Junior Member
 
Join Date: Nov 2013
Location: Southwest Colorado
Chapter: Midwest
Posts: 2
Rep Power: 0
 
Trader Score: 0 reviews
Thanks for the follow-up post. I replaced my IAC with an aftermarket one and my original high-idle problem went away but now I have hard shifting at low speeds and a slightly high idle at times. I'll try a Motocraft unit since aftermarket are unreliable. Is there a forum for identifying "known problems" like this? Thanks again!
ronnocoman is offline  
post #9 of 11 (permalink) Old 11-14-2013, 05:42 PM
Technical Advisor
 
Join Date: Feb 2007
Location: Milwaukee, WI
Chapter: Midwest
Year: 2005
Model: Ford Taurus
Engine: 3.0L 24v Duratec V6
Posts: 6,020
Rep Power: 74
     
Trader Score: 0 reviews
I have never had any luck with any non Motorcraft IAC on any Ford.

05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car
95 Taurus GL Vulcan winter car
Toy #1 - 86 Tbird 5.0 (original owner) - LOTS of mods
Toy #2 - 88 Tbird Turbo Coupe - LOTS of mods
67 Honda 450 Super Sport - completely customized
Jeff K is offline  
post #10 of 11 (permalink) Old 11-14-2013, 06:07 PM
Senior Member
 
Join Date: Nov 2011
Location: MA
Chapter: Northeast
Posts: 726
Rep Power: 13
 
Trader Score: 1 reviews
When I changed my IAC with a Duralast one, my car went haywire, so I returned it and got one from Advanced, which seemed to do better but still didn't idle proper. After further checks I found the PCV elbow had collapsed because it was worn. The new PCV elbows (under IAC) are ribbed for extra strength. I ended getting motorcraft PCV elbow and PCV Valve and line from Rock Auto. The car never had an issue again.

Heads Up.


Last edited by mercman; 11-14-2013 at 06:10 PM.
mercman is offline  
Sponsored Links
Advertisement
 
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Taurus Car Club of America : Ford Taurus Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome