Is the idle air control valve required or can i lleave it unplugged?

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2001 Ford Ranger
regular cab, 2.5L, stickshift
Custom full length console with 10" PG and 2 pioneers
bullet hole rims and aluminum runnin boards
thrush exhaust with 2.5 outlet duals

Required...you will most likely get a check engine light and not pass inspection if unplugged. Doesn't your truck run bad with it unplugged?

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1998 2.5 Ranger XLT 2wd...with a cap

You won't have a CEL or emissions problem.


The idle air control only controls the fuel and air mixture at idle.

You need it for proper idle.

--1993 ford ranger ext cab 3.0 v6--

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1993 ford ranger 3.0 v6

In an automatic u can get by without it. If its a manual it will stall when u drop in neutral. <--- experianced this

Why on earth would you want to leave it unplugged. It will not idle or run properly at any RPM. It isn't just idle that will be effected. The IAC doesn't disappear when you step on the gas, it is still there and still will be uncontrolled air bypassing throttle plate.

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(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

I cant even imagine an answer to this, but I have to say this is certainly one of the more interesting automotive forums I've been on!

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1997 Ford Ranger XLT, stepside
2.3L 2wd, 5-speed
All Stock

No, ford put it there purely to fuck with you.

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-Alex
'10 Ranger XL 2.3L Manual
Mods: Stereo, Tint, Weatherguard rain shields, Intake silencer removal, LED brake, turn signal, reverse, license plate, and dome lights, DDM HID's (currently removed), lowered, 17" wheels with spacers, Explorer autodim mirror with Autolamps, Magnaflow exhaust, Buggman LED 3rd Brake Light...

When its unplugged my truck runs fine. When i have it plugged up it revs up really high (3-4000) rpms when i clutch it. I have put 2 brand new ones on it and it still does the same thing with them. So i figured just leave it unplugged because it seemed to have fixed the problem.

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2001 Ford Ranger
regular cab, 2.5L, stickshift
Custom full length console with 10" PG and 2 pioneers
bullet hole rims and aluminum runnin boards
thrush exhaust with 2.5 outlet duals

I will assume you are a noob and refrain from the wiseguy comments. Yes the IACV is required. If it is acting up take it off and clean it out. If it still is acting up replace it.

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

He said in his last post, that he has replaced it twice and it is still giving him problems.

Living the low life, but feeling the high life.

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'96 EXT CAB 3.0 5SPD
MODS: 5spd swap, e-fan

You can drive with your rear brakes removed but I would not recommend it......driving a car with an erratic idle that could cause your engine to stall at any moment is not my definition of "getting away with it"

I noticed that........I think what happened is that I read the thread on my puter at home and burst out into non stop laughter losing all sense of time.......when I came back to reality and stopped laughing I was in my truck and I posted from my droid..........I think about an hour or so had lapsed.........My bad!!!!!

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Well then ......there is something else causing your idle issue.....I would recommend getting a code reader/scanner and checking periodically for codes. I have solved lots of issue by monitoring my OBD system and catching pending codes.......

* P.S. Disconnecting a sensor on your truck is not fixing the problem!

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

It's cool I wasn't trying to call you out on it, just didn't know if you seen it or not

Living the low life, but feeling the high life.

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'96 EXT CAB 3.0 5SPD
MODS: 5spd swap, e-fan

That is just not true on the OP's truck. He will at a minimum get a P1504. In my State you can not pass the yearly inspection with any codes.

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Stinkbait. Question for you. How do you get your signature to show up on the FRF APP?

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

I had the same problem when I cleaned my IACV, you actually can put something between the IACV and the manifold and it will still run, albeit poorly. If you unplug it you will get a CEL right away.

I fixed my high idle issue by turning the idle screw down a hair. Can't stress enough, turn it a little at a time until your idle is what you want. Don't lower it too much or your throttle plate will get lodged in the housing and cause issues.

If you replaced you IACV I would recommend cleaning your MAF sensor as well. Use ONLY MAF Sensor cleaner.

After all that, your computer will still take a little while to "re-learn" everything so your idle will still be a little high but will smooth out the more you drive it.

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2008 Shadow Grey 2.3 4 Cylinder, 5 Speed Manual, Ranger XL Standard Cab, 6ft Bed Fleetside, 112 Wheel Base, 3.73 Axle Code 86

Installed: Uniden Pro520XL, Aluminum Camper/Topper

"I thought this was America, huh, isn't this America, I'm sorry I thought this was America" -Randy Marsh

Stinkbait. I think I figured it out.

1999, Reg Cab, 2.5, 5 speed, 145k. Sent from my DROID BIONIC using FRF App

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).