Is your mustang stumbling, dieing at idle or idling rough?
I am writing this due to the overwhelming threads started about their mustangs with these symptoms stated in this title. If you do a search on here you will find many threads started because of members stangs exhibiting these signs and almost 9/10 replies back to their problems is a faulty IAC valve or Idle air control valve. It seems this is a faulty unit from ford that can go bad as little as 20k miles or less. Mine went bad around 54k. Thankfully it is a relativitely cheap part to replace and very easy as well. If your car is showing these signs this is the first part I would replace after checking for loose vaccum lines or making sure the car has a good tune up. It has been discussed to pull the part off, shoot some carb cleaner in it and throw it back on. I did this, but it is only a band aid fix and will not last forever or really that long at all. If someone can post a pic of the IAC id appreciate it. I will try to describe it. It is a cylinder shape metal part that is attached to the plenum on the drivers side with 2 bolts. It has a vaccume line attached to it and an electrical connection. Do a search for more info, and if u have any questions feel free to ask them on this thread! Thanks
Brandon
__________________
1998 Mustang GT automatic stock gears, some mods...sold
Best et 14.690@94.37 with a terrible 2.24 60ft
New ride 2000 GTP, gutted air box with K&N, 180 thermo
Best Et 14.57@93.35
*mods after run, Autolite 605s, GMPP STB , MPS 3.7
My wife has a 1998 GT auto. When it rains or after a rain, the car will not idle. It will run at a higher rpm but not idle. Otherwise it runs ok.
Could there be another issue besides the IAC valve?
It can also be a dirty MAF sensor, just clean it with computer contact cleaner.
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Was your car running lean? I've been pulling my hair out trying to figure out my idleing problem. However, the car runs lean at cruise ant wot.
If it's running lean, it's because of incorrect readings from your MAF.
__________________
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Is your mustang stumbling, dieing at idle or idling rough? 
IAC valve; idle issues 
