IAC Cleaning - Easy Method???

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cbr900boy said:
I have a 98, but in theory couldn't you remove the actuator via the two screws and do the same thing?
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I just tried this on my wife's 98. I found a thread from someone on here, and they cleaned it without having to take the throttle body off.

Take off the intake from the throttle body. There is a small hole just before the opening, and you can spray some cleaner down that. I did 3 quick sprays, and let it sit for a couple minutes. Then I started it (it dies almost immediately). I let it sit about 10 minutes while I cleaned the throttle body.

Reconnected everything and started her up. It took a few tries, but finally kicked in.

Seems to have done the trick. Idles is smoother and she hasn't had a problem starting it back up when its warm.
 
Just like the guy did on the link I posted up I'm going to remove the 2 screws holding the IAC controller and see if reveals a valve shaft. If it does, I can move it back and forth while spraying Deep Creep down the idle port located inside the TB. I'm going to try it this weekend, I'll let you guys know if it works.
 
cbr900boy said:
Just like the guy did on the link I posted up I'm going to remove the 2 screws holding the IAC controller and see if reveals a valve shaft. If it does, I can move it back and forth while spraying Deep Creep down the idle port located inside the TB. I'm going to try it this weekend, I'll let you guys know if it works.
Click to expand...

Did that work out at all?
 
cbr900boy said:
Just like the guy did on the link I posted up I'm going to remove the 2 screws holding the IAC controller and see if reveals a valve shaft. If it does, I can move it back and forth while spraying Deep Creep down the idle port located inside the TB. I'm going to try it this weekend, I'll let you guys know if it works.
Click to expand...

If you pop off the IAC, make sure you have a replacement gasket. The original won't play nicely when you go to put it back together.
 
Honestly, I would just pull the throttle body and the IACV and go to town with a brush and cleaner... also pulling the IACV will give you a chance to replace the soft brass screws (that tend to strip easily)with some decent metric bolts. It really doesn't take long and otherwise you'll just be filling the IACV with the gunk you want out, plus you're already halfway there if you have the intake off. Gasket was like 3 bucks locally at auto parts store. That's my approach though, do it right or not at all.
 
Don't remove the screws with paint marks on them. The valve controller magnet or whatever inside is adjusted at the factory to a certain setting.

Take off the throttle body and the 4 screws and use a new gasket. If you need to open the valve you can carefully stick a q-tip or pipe cleaner in there it should move very easily.
 
jstim said:
Did that work out at all?
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Sorry guys for the late response. YES, it did work. After removing the two screws, the controller pulls right off to reveal the shaft. You "gently" roll the shaft back and fourth while spraying Seafoam Deep Creep down the access hole (sounds like a porn...hahahah). After a good cleaning, just place the controller back on and placed the screws back, thats it. I would suggest trying this method if you don't want to remove the whole IAC valve. However, if your IACV is heavily gunked up then by all means remove it for a more through cleaning or even replacing.
 
cbr900boy said:
Sorry guys for the late response. YES, it did work. After removing the two screws, the controller pulls right off to reveal the shaft. You "gently" roll the shaft back and fourth while spraying Seafoam Deep Creep down the access hole (sounds like a porn...hahahah). After a good cleaning, just place the controller back on and placed the screws back, thats it. I would suggest trying this method if you don't want to remove the whole IAC valve. However, if your IACV is heavily gunked up then by all means remove it for a more through cleaning or even replacing.
Click to expand...

Whats that pink fluid that came out of the lines on either side of the IAC valve?
 
I got a 98 as well my idle was average 1200-1300, tried cleaning the iac as best as I could, got most of the carbon build up and old gunk up coolant out, put it back and seemed like it got worse, sucker would go to 1500, ended up just buying a new one along with a new tb gasket and now my idle is at 700-800 normal temperature if you want to save some money Amazon has it cheap and reviews says its oem
 
It looked like that was a Highlander and not a 4Runner. I have a 2002 Limited and I don't have a separate IAC. It's built into the TB from what I read. The best way to clean the IAC on the older 3rd Gen is to remove the TB and then remove the IAC. Spray cleaner into it and then use pipe cleaners to get to the inside valve to clean it. Once it is clean, the valve will move freely back and forth. At this point, it is clean and ready to be installed. Your truck will run better.
 
So I have a new IAC, I pulled the old one out, and cleaned it. It really doesn't seem like it was in that bad of shape, but I am just going to replace it. Just putting the 4Runner in the garage, the idle dropped low enough that it died, twice. I cleaned the TB too. Its all going back together tonight, and we will see how it goes from there. If its not the IAC, or the PVC valves, I will be at a loss.
 
I was having a slightly rough idling and the screws were stripped on the IAC so I just sprayed some MAF sensor cleaner in the IAC, let is sit for a minute and then started the car (without the air hose connected to the TB so it died quickly). did this a few times and the idle has been much steadier every since. No issues so far.
 
I pull the lower vacuum line and spray into it and when the fluid isn’t full of black rap coming out of the throttle body I’m done.


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