I have a rough idle so I watched a couple videos on how to clean the IAC. More people than not said keep the throttle body on and while at idle spray tbc into the hole until it dies. All the videos I watched took about 10 seconds or more for it to die. As soon as the spray hits the hole mine dies. Does anyone know why this is happening?
Cleaning the IAC valve
- Thread starter Ziondogg
- Start date
The IAC is easy to pull it with a torx bit. I was able to clean it really good with it removed. I'd just do that rather than trying to figure out why cutting corners isn't working for you.
I've done both methods, and removing the same IAC allowed me to clean it better than I could with it installed.
I definitely wasn't cutting corners, I just thought that was the preferred method. I'll pull it tomorrow and clean it that way.
You weren’t cutting corners at all, you just didn’t know the best method to clean your IAC. Like others were saying you can just pull your IAC plunger (Torx Bit) or IAC housing off (Security Torx) or you can just pull your entire TB off and have more room to work. Whatever is easiest for you man, it’s your jeep at the end of the day
You can clean the IAC solenoid by slowly spraying TB cleaner into the port just above the throttle plate.
If the engine stalls; you have sprayed too much into the port unless that is what you were trying to stall the engine.
As others have posted; the most preferable way to clean the IAC would be to remove the IAC solenoid from the housing attached to the TB so you do not damage the gasket between the TB and the IAC housing. Replacement gaskets can be difficult to locate.
When the IAC is removed from the housing and you have thoroughly cleaned the solenoid disc; make sure the housing seat (seating surface for IAC disc) is cleaned of any residue otherwise the disc may stick to the seat or not modulate properly.
If the engine stalls; you have sprayed too much into the port unless that is what you were trying to stall the engine.
As others have posted; the most preferable way to clean the IAC would be to remove the IAC solenoid from the housing attached to the TB so you do not damage the gasket between the TB and the IAC housing. Replacement gaskets can be difficult to locate.
When the IAC is removed from the housing and you have thoroughly cleaned the solenoid disc; make sure the housing seat (seating surface for IAC disc) is cleaned of any residue otherwise the disc may stick to the seat or not modulate properly.
I honestly didn't know that's how it worked and didn't try. Will try tomorrow. If it doesn't move in and out is it bad?
It’s supposed to move in and out freely so it can adjust how much air is being let into the TB at idle. If it’s stuck too far closed and you’re not getting enough air into the engine I’m sure that could cause a rough idle. I’m no expert and I could be wrong but it takes like 20 minutes to pull off the air box, unscrew it and take a look and then reassemble.
Just a quick and simple test. If you start it up and idle is all wonky don’t worry because the pcm needs to tell the valve to do its job and close or open to where it should be
Just a quick and simple test. If you start it up and idle is all wonky don’t worry because the pcm needs to tell the valve to do its job and close or open to where it should be
So when I pulled it, it wouldn't move back and forth until I forced it to. Reinstalled it and it's still has a rough idle. I think I just going to replace it.
Replaced it and it still idles rough. What else could cause this? I cleaned the throttle body while I had it off. I also recently changed the plugs and injectors because I was having a long crank then start. I also have only 40 psi fuel pressure when started.
This would have been good info to add to the OP…..
Did the rough idle begin immediately after replacing the plugs and injectors? Did it cure your hard start issues?
What brand of injectors?
What brand of plugs?
Also agree with looking for vacuum leaks. I’d check the vacuum with a gauge. Might have damaged an oring when installing the injectors. Spray carb cleaner around the outside of each injector, the throttle body, etc. If you have a vacuum leak, the carb cleaner will be pulled into the intake and you’ll hear the engine briefly speed up.
Any trouble codes?
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