iac valve problem - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 2 (permalink) Old 01-29-2013
00mustang95's Avatar
Posts: n/a
iac valve problem

i just replaced my iac valve a week ago because the rpm would go down and the car would sometimes stall. when disconnected my old iac valve connector nothing would happen to the rpm which means its bad. i purchased a new one and installed it. now when i disconnect the connector the car idle would drop by about 100 rpm and the car idled fine. 2 days later my car is turning off after startup and the car is making a humming noise during startup and acceleration when i disconnect the iac nothing happens to the rpm but this loud humming noise goes away. could it be that the iac i brought broke in two days time or that there is something causing it to break.by the way its a 99 gt and i purchased the iac from rockauto but this one has a black cap on it and my old one diddnt.

Sponsored Links
post #2 of 2 (permalink) Old 01-29-2013
PONY Member
Alfiedagr8's Avatar
Joined: Jul 2011
Location: Bakersfield
Posts: 350
It does sound like the iac is bad. By the way never buy aftermarket iac. Always buy from ford. And for future reference. If u disconnect an iac and it doesn't change. U still need to test further. You need to check base RPM. Then u can try pinching off the iac tube while disconnected and see if it affect rpm when its disconnected.

Sent from my iPhone using Tapatalk

Alfiedagr8 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


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 post new threads
You may 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 Off
Pingbacks are Off
Refbacks are On

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