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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-02-2015
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What is this part?

Hey Smarter Than Me Folks!.

I've got a picture of a part and don't know what it is or where the orifice goes.

I put a black cap on it today (as seen in the picture).

Can someone tell me what it is what where I should plug the orifice into?

Thanks again.


From a "Certified", "Non-Mechanic".
David
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What is this part?-module.jpg   What is this part?-module1.jpg  
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Old 08-03-2015
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That is your Idle Air Control module (IAC). the place you put the black cap is a vent. Does not need to be covered up Should of had a vent cap already on it.
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Old 08-03-2015
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What does that vent cap look like....
Thanks for the post.
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Old 08-03-2015
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The IAC valve is an electric "step motor" that operates a plunger type valve.
It is mounted on an air passage that by-passes the throttle plate, so it is in essence a controlled vacuum leak.

A Step motor is a "digital motor", it will have at least 100 "steps" the computer can call up
Each "step" will cause motor to turn 5deg, so computer can send a voltage pulse to IAC Valve, like a morse code, and motor will turn to a specific "step".
Each time motor turns the plunger will move and the amount air bypassing the throttle plate will change.
This is how the computer sets the idle, since fuel injection doesn't have "jets" like a carb, an idle screw will not work, well it wouldn't work well, lol.
When you turn on the key computer will open IAC valve all the way, so when you start the engine idle should be high, and then it will drop to pre-set idle range for cold engine or warm engine when computer starts closing IAC valve.

The vent on the side is for the back side of the plunger/valve, this allows it to move in and out without air being trapped behind it.
There should be no active air flow coming out or going in via that vent, the cap doesn't seal it, it is so it doesn't get clogged up

Last edited by RonD; 08-03-2015 at 01:14 PM.
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Old 08-03-2015
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Hello RonD;
Thank you for the reply.
There is an air-output coming out of that port (I can feel it) that I closed out.
I guess I need to find 'whatever' goes there and put it on.
Any ideas?

Thanks again;
David
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Old 08-03-2015
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Best bet is a wrecking yard, Ford used the same IAC Valve on many of their fuel injected engines.
Cap just pulls/pops off and on

Good read here with pictures: How to: IAC valve cleaning thread (w/pics) - Ford Explorer and Ranger Forums "Serious Explorations"
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  #7  
Old 08-04-2015
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Found the piece at the Salvage Yard and put it on... Looks like all is well.
Thank you again for all your help.
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