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IAC valve cleaning thread (w/pics)

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Old 07-27-2003, 10:46 PM   #1
karl_burns
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IAC valve cleaning thread (w/pics)

Have you ever noticed a loud hum and/or whine (whining) coming from your engine bay? Or more specifically your intake area? Or does your engine have a hard time holding the idle? Well, more often than not, this is due to a dirty IAC Valve. Since everyone is always asking about it, hopefully this will help.

My engine was making the loud hum / whine noise. AutoZone wanted $131.99 for a new part. and it's $50 deductible against my extended warranty, so I wanted to fix this myself. I purchased a can of Electrical Parts cleaner, the non-residue type, drove home and let the engine cool. Here's a pic of where the IAC Valve is located under the hood:


Two 10mm bolts to remove, and unclip the electricals:


Here's the dirty intake's connection with the IAC:


Turn the valve to notice two chambers. Inside one of them you will see a spring. Inside the other, you will probably see a bunch of dirt coating what should be an exposed sensor. Spray the Electrical parts cleaner liberally, directly into the opening, and watch until the liquid coming out of the valve is clear (white). Set the IAC on a towel or clean surface and allow any other liquid to drain and the sensor to fully dry. Here's a picture of a clean IAC valve (underside):


And don't forget to clean the sensor below the black snap off cap on the side of the IAC valve:


After allowing to dry, replace the IAC and start your truck. You should allow the engine to warm up for a few mintues and the computer will re-learn how much air to allow into the engine at idle.
I experienced a much LOUDER whine after doing this for the remainder of the day, but I only allwed the liquid to drain for about 2 minutes. The whine hasn't returned in two days since, so I'm guessing the liquid cleaner wasn't completely drained when I replaced the IAC Valve. Just a warning in case you are anxious like me.

Karl

CBOUG76.... can I be on the Useful Threads list?




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Old 07-28-2003, 09:23 AM   #2
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What!!!!! You didn't take off the plastic cap

The outside black plastic cap that easily spins will pop off and snap back on without damage. Inside there is a felt filter pellet. Cleaning just the valve without removing this often cloggs this filter up worse. This source of back air flow balances the valve and provides clean air to prevent buildup on valve. Often just cleaning this will get rd of the moose calls. Add pictures of this and you have something.




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Old 07-28-2003, 10:18 AM   #3
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karlito, i am so proud of you! you got your hands ditry! now i need a moment to wipe the tear from my eye. you do know, however that not allowing the cleaner to drain completely could have led to an incendiary situation, though.




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Old 07-28-2003, 10:41 AM   #4
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Nice pics, thanks.




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Old 07-28-2003, 02:24 PM   #5
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Ooooooohhhhh

Now that I know it spins off, I'll check that tonight. Mine wasn't coming off easily, so I didn't press my luck.
I'll append my post with pics of that.
Thanks Opera House,
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Old 07-28-2003, 02:29 PM   #6
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It doesn't spin off, it just pops off when you pull it outward.




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Old 07-28-2003, 03:08 PM   #7
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i think i'll try this saturday, i'm getting tired of the whining also.




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Old 07-28-2003, 08:03 PM   #8
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I updated to include the black cap

Didn't look like much in there, but went ahead and sprayed cleaner on it as well. Allowed to dry for almost an hour, so hopefully I don't get that same 100 db whine I got when it was still wet Saturday!
At least it went away, and I didn't have a date that night.....
<Don't even think about flaming me Doug>

Karl




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Old 07-29-2003, 12:11 AM   #9
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and I didn't have a date that night.....

NO DATE?!?!?!? are you losing your touch?




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Old 07-29-2003, 11:12 AM   #10
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Arrrrgh This is a tough crowd to please

But, that plastic item is two piece. The outside plastic cap snaps off the inner plastic piece which stays on the IAC. Between these two pieces is the felt filter pellet. Interesting how much sand makes its way up there.




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Old 08-23-2003, 10:07 PM   #11
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Sorry I'm not that smart when it comes to mechanics but... what is that thing under the IAC called. It has 2 tubes leading down somewhere in the engine and has an electrical socket aswell?




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Old 08-23-2003, 10:31 PM   #12
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I noticed you have a '98, karl. I have a '97 with 60k miles and have not experience this problem at all [knock on wood]. What mileage does this normally occur?

Very good write up btw.




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Old 08-23-2003, 11:09 PM   #13
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i have a question...i've done all this and the wineing noise still hasn't gone away. my rough idle has some but it comes back off and on. i'm just wondering if its not functioning as well as it should be. how do u know when it needs replaced?...thanks...

adam




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Old 08-24-2003, 02:54 AM   #14
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I really think most IACs have to be replaced

The other day, while this thing was wining a whole lot during idle and driving, I decided to pull over, popped the hood, and yanked/removed the black plastic cap from the side of the IAC. NO more whining. NO loss in milage. NO change in idle.
Hmmmmm........
Karl




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Old 08-24-2003, 09:30 AM   #15
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karl_burns, wouldn't removing the black cap get the inside of it dirtier faster? It's gotta be there for a reason. If nothing else its there to cover the inside so dirt would not go in.




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Old 08-24-2003, 10:26 AM   #16
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Quote:
Originally posted by MaverickDaKid
Sorry I'm not that smart when it comes to mechanics but... what is that thing under the IAC called. It has 2 tubes leading down somewhere in the engine and has an electrical socket aswell?
That's the DPFE. I had to replace that last week because of the CEL.




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Old 09-28-2003, 04:17 PM   #17
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Idle

Hello all, I just brought a 97' xlt 5.0L, and I notice an idle problem also BUT IT HAPPENS AFTER THE TRUCK WARMS UP!, when I sitting at a traffic light it starts to vibrate a little then some times alot(like it wants to shut off). My question is do the IAC sensor have problems on v8 also?. and is it located in the same place as the v6

Thanks in advance, the dealer I brought the truck is a distance (2.5hrs), I want to have an idea what the problem is so I don't have to make more than one trip!

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Old 09-29-2003, 02:31 PM   #18
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Just cleaned my IAC, it was SUPER dirty. I was having trouble starting, and a dip in RPMs (almost to the point of stalling) when coming to a stop. We'll see if the cleaning helps, I used denatured alcohol.

I wasn't able to clean the felt pads that well




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Old 09-29-2003, 06:33 PM   #19
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I also cleaned mine out today it was DIRTY! coming from a paintball backround which involves a lot of valving I don't even see how it sealed properly lol

I used some Turner Labratories electronic parts cleaner w/quick dry tech. and it worked great... just waiting for them to dry off

Also do I need to take the negative battery cable off for about 10 minutes to clear the PCM?
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Old 09-29-2003, 08:15 PM   #20
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Just let it dry and you should be fine

I don't think I disconnected my batter either.
Actually, my IAC continued to whine, and I yanked off the black cap. Instantly, no whine. So I'm thinking the cap gets loose and air tries to get through there causing the whine? I also think that becasue of the video someone put up here about the IAC whining when his hand attpeted to partially seal off that hole the black cap covers.
Thi is so weird.........
Karl




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