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Old 09-20-2013, 01:22 PM   #1
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Please help! What is this part

Hey i accidently turned this.. What is it and what does it do... Mine turns should it be pressed down tight or is it supposed to be set some how...
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Old 09-20-2013, 01:23 PM   #2
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Pics?
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Old 09-20-2013, 01:24 PM   #3
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Pics?
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Old 09-20-2013, 01:24 PM   #4
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?? is there supposed to be a picture with this or do we get to guess?

Edit -

Ah there is a pic now and my first guess wasn't even close.

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Old 09-20-2013, 01:25 PM   #5
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HAHAHA Was supposed to be a pic but some how didn't upload it rite... can you see now
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Old 09-20-2013, 01:36 PM   #6
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can you see the picture, any idea
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Old 09-20-2013, 01:42 PM   #7
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Its something on the upper intake plenum / throttle body assembly but I can't ID any closer than that.

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Old 09-20-2013, 01:44 PM   #8
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is your pressed down and secure or is it loose like mine, seems like it could be an adjustment screw of some sort but I don't want to move it if that's the case... or it may just be loose and I should push it down tight hah wish I knew
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Old 09-20-2013, 01:47 PM   #9
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Not sure, I don't have one of those on either of my Mustangs, one is too old and the other is too new I'm just going off of what I can see in the pic.

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Old 09-20-2013, 02:21 PM   #10
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I'm no help here with ID'ing that thing, just wanted to give u some props for a clean-azz engine bay
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Old 09-20-2013, 02:40 PM   #11
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It's part of the idle air control. Mine spins around also. I never took it off but I think it just covers another nipple for a hose for other cars. Wouldn't worry.
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Old 09-21-2013, 06:23 PM   #12
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It is just a cover for a vent into the space behind the diaphragm on the older Hitachi IACs, the newer Nippon-Denso units do not have it:

Hitachi IAC:



Nippon-Denso IAC:
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Old 09-21-2013, 06:34 PM   #13
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so mass produced part and the vent meant for another model is not needed for my car, so capped she is
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Old 09-21-2013, 06:49 PM   #14
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Originally Posted by Mustangman705 View Post
so mass produced part and the vent meant for another model is not needed for my car, so capped she is
It has nothing to do with being made for another model, it is a vent for the space behind the IAC motor sealing diaphragm. Here is a sectional drawing of the valve:



I.e. it is a result of top-notch engineering to make certain air pressure in the motor housing did not interfere with the IAC valve's plunger motion. It was most likely eliminated in the later units as a cost cutting measure.

If you plug it off then it will no longer do what it was intended to do--this probably doesn't matter as the later IAC design did away with it with no apparent problems, however it is a superior design...
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Old 09-21-2013, 07:04 PM   #15
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dumb it down for me mr.wiki hahha so its not just a cap.. its a vent that supposed to open and close. what should be done with it. by me spinning it it didn't harm the function did it... from the looks of it its just a chamber with a cap on it
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Old 09-21-2013, 07:25 PM   #16
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dumb it down for me mr.wiki hahha so its not just a cap.. its a vent that supposed to open and close. what should be done with it. by me spinning it it didn't harm the function did it... from the looks of it its just a chamber with a cap on it
It is a vent. Vents do not "open and close", that would be a valve; they are just open, like the "stink pipe" on your sewage system.

I.e. it is just a "hole" with a filter in it--turning the cap did nothing. Under the cap is a filter that is open to the atmosphere on one side and open to the space behind the diaphragm isolating the IAC solenoid motor from the IAC valve plunger.

The vent is there to relieve any pressure/vacuum build-up in the motor housing, the filter keeps crap from getting in--it is probably engineering overkill as the valve does not have that great a range of motion, nonetheless there is no reason to cap it off.

Oddly the early Hitachi IACs with the vented motor are usually less expensive that the later unvented Denso sourced part--go figure...
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Old 09-21-2013, 07:46 PM   #17
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so whats the purpose of the cap, wouldn't it be smarter to take it off
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Old 09-21-2013, 08:02 PM   #18
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so whats the purpose of the cap, wouldn't it be smarter to take it off
I believe he's explained it quite well already.... The cap is to prevent debris from falling into the vent.
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Old 09-21-2013, 08:06 PM   #19
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so whats the purpose of the cap, wouldn't it be smarter to take it off
My mother always said "If you can not say something nice, say nothing."

So, I have nothing to say...
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Old 09-21-2013, 08:10 PM   #20
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LMAO
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Old 09-21-2013, 08:21 PM   #21
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hahaha I see what hes saying but with a cap on there really is no vent, why sue a cap instead of just having the extra chamber casted in. its not like any air gets in and out past that cap
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Old 09-21-2013, 08:24 PM   #22
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hahaha I see what hes saying but with a cap on there really is no vent, why sue a cap instead of just having the extra chamber casted in. its not like any air gets in and out past that cap
Its a vented cap MM...
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Old 09-21-2013, 08:26 PM   #23
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hahaha I see what hes saying but with a cap on there really is no vent, why sue a cap instead of just having the extra chamber casted in. its not like any air gets in and out past that cap
For God's sake, the cap does not seal the vent--it is loose fitting; that's why you could turn it. It is the first line of defense to prevent big crap (sand. etc.) getting into the filter...
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Old 09-22-2013, 11:23 AM   #24
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So what does it do again cliffy?
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Old 09-22-2013, 02:47 PM   #25
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So what does it do again cliffy?



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Old 09-22-2013, 05:03 PM   #26
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hahah I still don't see it working as a vent, that cap keeps it pretty air tight. spin or no spin its plugged
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Old 09-22-2013, 05:40 PM   #27
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hahah I still don't see it working as a vent, that cap keeps it pretty air tight. spin or no spin its plugged
Then take it off and see what it does for you...
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Old 09-22-2013, 05:53 PM   #28
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why would I remove a cap from something that's capped off
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Old 09-22-2013, 06:01 PM   #29
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hahah I still don't see it working as a vent, that cap keeps it pretty air tight. spin or no spin its plugged
That is because you have no knowledge of even the most fundamental aspects of electro-mechanical engineering; and apparently cannot even understand it when a picture is provided. Filtered venting of solenoid and other motor housings is commonplace, and in a small motor like this the amount of air flow is miniscule, probably less that a few trillion molecules per minute*. This vent's design and function are obvious in the pictorial sectional drawing I posted above.

Pop the cap off and perhaps it will then make some sense to you...

----------------------------------------------
* - Dry air at standard temperature and pressure has 2.5e21, or some
2,500,000,000,000,000,000,000 molecules per liter.

A "few trillion per minute" would be just a lousy 4,000,000,000,000 to 5,000,000,000,000 molecules.
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Old 09-22-2013, 06:38 PM   #30
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You Mad Bro
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Old 09-22-2013, 07:36 PM   #31
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You Mad Bro
Not at all. However after nearly 60 years of turning wrenches, and many many years of practicing and teaching mechanical engineering, I have a difficult time with people who have stopped learning and prefer instead to by guided by uninformed preconceived notions...
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Old 09-22-2013, 07:37 PM   #32
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Let me have a crack at this... Cliffyk gave a very accurate, technical explanation but I can see how calling the cap a filter can be misleading. Generally, when I think filter, I think screen or paper mesh but in this case, the cap is a filter by not allowing outside debris in but still allowing pressure to seep out from under this cap. The cap is loose because when pressure builds up inside the iac valve the loose cap will allow the pressure to escape.

This filter works exactly like the breather on a rear axel. Which unlike mine, is all clogged up and every once in awhile spews out axel fluid all over my axel housing.
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Old 09-22-2013, 07:44 PM   #33
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ahhh I understand now hahah already understood but I guess the cap altho it is covering the hole is not completely air tight allowing the pressure to still escape... Cliffyk as mentioned has got to be at least in his 70;s or 80;s and is just writing word for word out of his text book haha
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Old 09-22-2013, 07:44 PM   #34
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Old 09-22-2013, 08:07 PM   #35
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There is no misnomer here, the visible black plastic part is a cap, just like one that would go on your head. It is not a sealing cap like a cap on a bottle, but it is indeed a cap--think of it as the difference between a baseball cap that keeps the sun off your head and eyes, and a full coverage motorcycle helmet that seals in your brains in a bad crash (making the clean-up crew's job a more pleasant task).

Here is how it works:



The plastic cap is as I said earlier a first line of defense keeping big shít out of the vent. Air, again a VERY small amount of air, passes up (and down, back and forth as needed to vent the solenoid) from underneath the cap, past the top of the vent hub that the cap snaps onto, and then through the filter in and out of the motor cavity.

This air flow is completely unrelated to the flow through the IAC valve, labeled AIR FLOW INLET and AIR FLOW OUTLET above. The vent's presence indicates to me Hitachi's very conservative and solid design goals.

Its absence on the Nippon-Denso sourced part indicates an obvious cost-cutting measure; one that likely does not matter, but a "cheaper" part nonetheless...
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