4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Car is idleing WAYY too high!! HELP

Thread Tools
 
Search this Thread
 
Old 02-16-2011, 07:10 PM
  #1  
ShuggaShane05
Thread Starter
 
ShuggaShane05's Avatar
 
Join Date: Feb 2011
Location: Georgia
Posts: 5
Default Car is idleing WAYY too high!! HELP

I just done a tune up on my car today. changed my plugs and serpatine belt and also had the trouble codes run on my car and idle air control valve was bad which i knew. if i leave the IACV unplug the car idles around 900-1000 rpm. if i plug in the IACV the cars idle shoots up to 1600-2000 rpm and stays there! eventually after a minute or two itll slowly idle down to aroudn 1000rpm then if i touch the throttle slightly it shoots back up. i put a brand new IACV on and got the codes reset and nothing. same deal. i unplugged the battery cable for 5 mins then hooked it back up and same thing still!! Im completely stumped and have no idea wat would be causeing this. Anybody have any suggestions?! PLEASE HELPP!!
ShuggaShane05 is offline  
Old 02-16-2011, 08:42 PM
  #2  
96meangreengt
2nd Gear Member
 
96meangreengt's Avatar
 
Join Date: May 2010
Location: mississippi
Posts: 386
Default

Originally Posted by ShuggaShane05
I just done a tune up on my car today. changed my plugs and serpatine belt and also had the trouble codes run on my car and idle air control valve was bad which i knew. if i leave the IACV unplug the car idles around 900-1000 rpm. if i plug in the IACV the cars idle shoots up to 1600-2000 rpm and stays there! eventually after a minute or two itll slowly idle down to aroudn 1000rpm then if i touch the throttle slightly it shoots back up. i put a brand new IACV on and got the codes reset and nothing. same deal. i unplugged the battery cable for 5 mins then hooked it back up and same thing still!! Im completely stumped and have no idea wat would be causeing this. Anybody have any suggestions?! PLEASE HELPP!!
I didnt think the idle air control valve would set in codes?

What brand IACV did you buy? I would recommend a motocraft IACV, I have had nothing but bad luck with autozone or oreily brand sensors.

Motocraft=good

Even after I put a new IACV valve on mine it took a couple of days before the idle settled where it was supposed to.

Last edited by 96meangreengt; 02-16-2011 at 08:45 PM.
96meangreengt is offline  
Old 02-16-2011, 08:55 PM
  #3  
ShuggaShane05
Thread Starter
 
ShuggaShane05's Avatar
 
Join Date: Feb 2011
Location: Georgia
Posts: 5
Default

I bought one from Advance auto. it was like 57 bucks. with my car being a stick it makes it hard to drive with it idled at 1700 rpms. not to mention its quite embarassing. :/ So idk wat to do. ive been ready up on it and nothin has helped. im bout to go unplug the battery for about 30 mins or so and see if that helps. prolly not but worth a try
ShuggaShane05 is offline  
Old 02-16-2011, 09:35 PM
  #4  
96meangreengt
2nd Gear Member
 
96meangreengt's Avatar
 
Join Date: May 2010
Location: mississippi
Posts: 386
Default

Originally Posted by ShuggaShane05
I bought one from Advance auto. it was like 57 bucks. with my car being a stick it makes it hard to drive with it idled at 1700 rpms. not to mention its quite embarassing. :/ So idk wat to do. ive been ready up on it and nothin has helped. im bout to go unplug the battery for about 30 mins or so and see if that helps. prolly not but worth a try
I would take back and get a motorcraft one from oreily's or late model restoration
96meangreengt is offline  
Old 02-16-2011, 09:46 PM
  #5  
topcat2k2
2nd Gear Member
 
topcat2k2's Avatar
 
Join Date: Sep 2009
Location: OH
Posts: 235
Default hoses and gaskets ???

You said you just did a tune up. Maybe you bumped a vacuum hose and knocked it off the plenum or CAI. Or, maybe you need a new gasket where the IAC bolts to the plenum.
If you think this idea might help, go to the American Muscle site and find their installation instructions for a new plenum (accufab or other) and check all the hoses and gaskets it talks about removing and re-installing.
Hope this helps.
topcat2k2 is offline  
Old 02-16-2011, 10:01 PM
  #6  
ShuggaShane05
Thread Starter
 
ShuggaShane05's Avatar
 
Join Date: Feb 2011
Location: Georgia
Posts: 5
Default

yea ill prolly be takin it back tomorrow being that its doin the same thing with the new one as it did with the old one.

and i triple checked all hoses and plugs just to make sure BUT the new IACV did not come with a gasket so i didnt replace it. but i dont think itd be doin the same exact thing as the old if it was the gasket. or would it?? idk im clueless on this. lol
ShuggaShane05 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
djbigskrilla
2005-2014 Mustangs
24
09-20-2022 01:04 AM
msavoia23
4.6L (1996-2004 Modular) Mustang
12
07-07-2018 12:08 PM
mirandaandjimmy
4.6L V8 Technical Discussions
20
11-16-2015 08:51 AM
92 5.0stang
5.0L (1979-1995) Mustang
4
08-13-2015 06:46 AM
Milan Dragway
Members Rides and Car Show Section
0
08-12-2015 03:43 PM



Quick Reply: Car is idleing WAYY too high!! HELP



All times are GMT -5. The time now is 09:22 PM.