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Lucky_317 Jan 2, 5:41pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
Idle Air Control Valve - How To Properly Clean

Problem - Dirty Idle air control valve.

Symptoms - Poor idle, self reving at idle and poor performance at a constant rpm.

How to fix - Clean your idle Air control valve.

Difficulty - Easy

Time - Approximately 1hr

Tools - 12mm socket, pliers, phillips head screwdriver, 2 small hose clamps (or small bolts to plug the coolant lines)
_______________________________________________________________________________

** If you don't know how to remove your intake prior to starting these instructions, put down your tools and don't attempt this**

There's a right way and a wrong way to do this. You could simply spray throttle body cleaner into the small hole on the inside of the Throttle body but it won't even come close to getting it clean.


Before/After:
Picture


Step 1:
remove the 2 Wire harnesses from the throttle body.
Picture
Picture
Picture

Lucky_317 Jan 2, 6:00pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
Step 2:
Remove the 3 Hoses from the Throttle Body. The Large one on top is easy. The 2 on the bottom are coolant lines so these 2 will need to either be crimped or you'll need to insert a small bolt to prevent the coolant from leaking everywhere. They are located underneath the Throttle Body and connect to the Idle Air control valve.

Picture


Step 3:

Remove the throttle cable from the throttle body.

Picture


Step 4:
Remove the 2 12mm nuts on the top and the 2 12mm bolts on the bottom.

Picture
Picture
Picture

Lucky_317 Jan 2, 6:14pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
**Note: I cleaned the TB and the IACV using the hole in the TB method to show how little gets cleaned without actually removing the IACV.**


TB before cleaning
Picture
**on the left side of this pic you can see the hole where most people clean their IACV the wrong way**
Picture

TB after Cleaning ** the IACV is already removed in these pics**
Picture
Picture


Now that the Throttle Body is OFF and cleaned we can move on to removing the IACV.

The IACV is located underneath the throttle body as seen in this picture...
Picture


Step 5:
Remove the 3 screws on the IACV.
Picture

Lucky_317 Jan 2, 6:25pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
You'll want to clean this out very good. You can see how dirty it still is after I sprayed it with cleaner from the inside of the TB.

Picture
Picture

Here's the IACV** see how filthy it is as well**
Picture

You'll want to remove the gasket prior to cleaning.
Picture

Here's what it should look like after cleaning
Picture
Picture

Pay close attention to the bar in this pic. It will be very dirty
Picture

Lucky_317 Jan 2, 6:25pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
That's all there is to it. cool Once you do that your car should idle nice and smooth and your car should run nice and smooth any time you're at a constant rpm. thumbsup thumbsup

Jtultra Jan 2, 11:19pm

Senior Member

2000 Toyota Celica

Posts: 453
Joined: Nov 2003
Marietta, GA
wow, should have done that when I was putting in my hondata heatshield...I've had enough of my engine for a good month or so

GTaintsobad Jan 3, 8:54pm

Member

2000 Toyota Celica GT

Posts: 173
Joined: Aug 2004
Saskatoon, Sask
about how long does it take for your TB to get that dirty? Does using an aftermarket intake make a difference?

hephaestus Jan 3, 9:29pm
Specialist

Posts: 1229
Joined: Oct 2003
New Jersey
Originally Posted by Lucky_317
That's all there is to it. cool Once you do that your car should idle nice and smooth and your car should run nice and smooth any time you're at a constant rpm. thumbsup thumbsup

I had always thought that the spraying way wasn't consistant with a well cleaning and rather difficult unless you have 4 arms or another person helping you rev the car and even that wouldn't be good enough, but good enough.
I have to admit though my throttle body and IACV wasn't nearly as bad as yours.
Nice write up.

Lucky_317 Jan 4, 1:53pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
My TB isnt usually that dirty. These pics came after I sucked up all the water into the TB.

RIP Mar 5, 1:08pm
2000 Black Toyota Celica GT
New Member

2000 Toyota Celica GT

Posts: 7
Joined: Oct 2004
N.Hollywood CA
At what mileage should this be done?

renfield90 Mar 11, 11:11pm

Senior Member

2001 Toyota Celica GT

Posts: 529
Joined: May 2004
Tempe, AZ
How similar is this on the GT?

Lucky_317 Mar 16, 11:35pm

Specialist

2000 Toyota Celica

Posts: 2243
Joined: Sep 2003
Fontana, CA
on a GT it's pretty close to the same.

______________________________________

there's no set mileage. it should be done whenever it becomes a problem.

marco9394 Apr 11, 5:51pm

Member

2000 Toyota Celica

Posts: 15
Joined: Feb 2005
Lowell, MA
Becareful with those smaller hoses connected underneath the TB
Be prepared to stock in some bolt to prevent coolant shooting out.
When i was doing mine, the coolant sprayed everywhere even got some in the header wtf
I ended up donate my $5 t-shirt, a hanger and half an hour trying to suck up all the coolant that got into the header thumbsdown
And now my car has a weird water flowing sound underneath the car when i rev it at idle but the car runs pretty smooth tho.
Any clue what's wrong with it? would it be bubbles in the cooling system because I topped off the coolant receiver? confused

Boynxdoor Jun 15, 9:31am
New Member

Posts: 6
Joined: Jun 2013
UK
Hi Guys, I'm new here and was looking at this Guide. Well I'm glad that I just followed the wrong way of cleaning the throttle body as I don't want to mess with that bearing that is hidden behind the IACV. To be honest the Car felt so much better after I did the other guide, the one You just need to take off that big rubber air pipe and give the Throttle body a good spray of Injector/Throttle body cleaner. I'm not saying this is no good as I want to do this as well when I have a perfect time and weather. I just want to make sure though that I'll be able to do this right to avoid ruining that bearing inside. Thank You deniance for that information and glad Your Car is running smooth now...

CaffeineKid Jun 15, 3:01pm

Specialist

Posts: 259
Joined: May 2002
California
The "Injector/Throttle body cleaner" guide which Boynxdoor is referring to:
http://www.celicahobby.com/forums/...php/topics/136588/Intake-Throttle-Body-How-To-Clean.html

Nyc2000CelicaGT Feb 18, 10:54pm
2000 White Toyota Celica GT
Member

2000 Toyota Celica GT

Posts: 10
Joined: Dec 2013
New York
hi is it normal for my idle to be high after this? i corrected it by lowering the TB bolt that holds the butterfly open. RPM went back to 800-900. At first it was above 1500. Please email me the answer @ m.chan2@aol.com


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