IAC repair tutorial
Thread Starter
Registered!!
Joined: Dec 2007
Posts: 21
Likes: 0
Rep Power: 0 
IAC repair tutorial
so if you have a rough idle or idle ralated issues its worth looking at the IAC or simple the idle valve .
the good thing is the idle valve the civic uses is serviceable so unless the coil is burned the problem is usually rust or debris .
the MAP and TPS can be cleaned in a similar way.
By checking the resistance you can make sure the TPS , MAP and Idle valve coil are working properly.
what is required .
1-wire brush
2-kitchen degreaser
3-ultrasonic cleaner ( a small one cost around 30$)
4-ultrasonic cleaning fluid i prefer ASNU brand or if not available water and a very small amount Laundry Detergent for non electronic parts.
5-gasket silicone
if your idle valve looks this bad it means the whole throttle body needs maintenance but that's anther write up.
1-you remove the idle valve from the throttle by removing the 4 bolts .
2-inspect for any physical damage any cracks or broken parts inside means that you need to replace it.
3-clean the whole thing with water and kitchen degreaser
4-using a wire brush clean as much as you can. for hard to reach areas i use a small electrical wire brush.
5-the ultrasonic cleaner will clean where you cant. keep the parts and the bolts for 15 to 20 minute in the ultrasonic cleaner.
6-let everything to dry and apply a small amount of silicone where needed.
the good thing is the idle valve the civic uses is serviceable so unless the coil is burned the problem is usually rust or debris .
the MAP and TPS can be cleaned in a similar way.
By checking the resistance you can make sure the TPS , MAP and Idle valve coil are working properly.
what is required .
1-wire brush
2-kitchen degreaser
3-ultrasonic cleaner ( a small one cost around 30$)
4-ultrasonic cleaning fluid i prefer ASNU brand or if not available water and a very small amount Laundry Detergent for non electronic parts.
5-gasket silicone
if your idle valve looks this bad it means the whole throttle body needs maintenance but that's anther write up.
1-you remove the idle valve from the throttle by removing the 4 bolts .
2-inspect for any physical damage any cracks or broken parts inside means that you need to replace it.
3-clean the whole thing with water and kitchen degreaser
4-using a wire brush clean as much as you can. for hard to reach areas i use a small electrical wire brush.
5-the ultrasonic cleaner will clean where you cant. keep the parts and the bolts for 15 to 20 minute in the ultrasonic cleaner.
6-let everything to dry and apply a small amount of silicone where needed.
Last edited by xxbgxx; Sep 16, 2016 at 04:35 PM.
Thread Starter
Registered!!
Joined: Dec 2007
Posts: 21
Likes: 0
Rep Power: 0 Re: IAC repair tutorial
well there is a thing i forget to mention is testing the IAC .
its a 3 pin coil the center pin is positive and the other 2 negative one for opening the valve the other for closing .
if its stuck try to rotate it until its loosen again.
to rotate it you need to remove the electrical coil and rotate the small magnet
Also apply a little amount of silicone grease at the spring and where the pin meets the magnet to keep the valve moving as free as possible.
i dont see why the need to replace unless its broken since its a a very basic low tech device.
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
redman24
7th Generation Civic 2001 - 2005
6
Aug 10, 2016 08:11 AM
divinmule
Fuel, Oil, Cleaners & Other Maintenance
2
May 5, 2016 08:24 PM
VictorWilliams
Mechanical Problems/Vehicle Issues and Fix-it Forum
4
Mar 1, 2016 11:54 PM
