1986-93 Mustang Idle Air Control (IAC) Adjuster - EFI V8 by 5.0 Resto

Mustang Idle Air Control (IAC) Adjuster (86-93) EFI V8


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  • Mustang Idle Air Control (IAC) Adjuster (86-93) EFI V8
  • Mustang Idle Air Control (IAC) Adjuster (86-93) EFI V8
Mustang Idle Air Control (IAC) Adjuster (86-93) EFI V8
  • Mustang Idle Air Control (IAC) Adjuster (86-93) EFI V8
  • Mustang Idle Air Control (IAC) Adjuster (86-93) EFI V8

This 5.0 Resto Idle Air Control Adjuster is a great start to solving your 1986-1993 5.0L Mustang idling issues!

Item #LRS-9939A

Your Price: $50.99

Market Price:$52.99
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Benefits

  • Allows Easy Adjustment Of Idle
  • Smoother Operation For Modified Engines

Features

  • Aluminum Construction
  • Easy Installation
  • Includes New Gaskets And Hardware
  • Fits EFI V8

What's in the Box

  • (1) Adjustment Plate
  • (2) Gaskets
  • (2) Bolts

Product Description

1986-1993 Mustang 5.0 Resto Idle Air Control Adjuster
This 5.0 Resto Idle Air Control Adjuster will put you one step closer to solving your idle problems! It is a must for EFI V8 Mustangs! This thin, adjustable aluminum plate fits between the throttle body and the idle air control motor. It allows you to adjust the flow of air in and out of the idle air control motor for better control of your Mustang’s idle speed.

How it works
This plate was originally engineered by Ford to combat carbon buildup in the throttle body that restricted airflow and created low idle concerns. This plate allows MORE air in to maintain a steady idle. The hot rod community quickly picked up on this part to help stabilize and achieve idle control on cars with camshafts, larger displacement engines, etc.

Application
-Fits: 1986-1993 EFI 5.0L


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Related Articles

  • 1986-93 Mustang Idle Air Control Adjuster Installation Instructions

    The Idle Air Control Adjuster spacer service kit is used to correct sludge contamination concerns of the throttle bore and plate only. Verify that the idle speed concern is not being caused by the fuel system, IABP solenoid, throttle linkage, ignition system, PVC system, EGR system, cooling system, or vacuum leaks befo... more

    Read more: 79 93 mustang , mustang

    Posted on 12/14/2016


  • Product Videos

    1986-1993 Mustang 5.0Resto Idle Air Control Adjuster - Review & Install

    Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!


    Customer Photos (3)



    Product Reviews (20)


    4.4
    out of 5 stars
    4.5 stars
    20 reviews
    5 stars    16
    4 stars    1
    3 stars    1
    2 stars    0
    1 star    2

    90%
    OF CUSTOMERS
    RECOMMEND THIS PRODUCT
    18 of 20 REVIEWS
    RECOMMEND THIS PRODUCT
    18 of 20 REVIEWS


    5 Stars   An excellent quick cure to a bad headache
    By on 4/29/2014
    Image uploaded by Mark  C. This kit is a simple and easy install that cures any fox that has been modified and has idle issues. It installs quick and easy,and does exactly what it says it does which allows the engine to idle without surging and/or dying. A must for any fox with aftetmarket camshaft!

    Yes, I would recommend this item to a friend!


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    5 Stars   Awesome fix to a terrible headache!
    By on 4/21/2014
    I just recently installed an E cam in my 90 LX,and after numerous attempts to get it to idle somewhat normal,I ran across some posts on the web of people trying the idle air control adjuster kit,to help modified mustangs idle normally. And boy did it help and solve a huge problem for me! Love it,and HIGHLY advise it to anyone having idle surges and dying problems! Awesome little kit!

    Yes, I would recommend this item to a friend!


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    5 Stars   Easy Fix
    By on 4/28/2014
    Bought this to fix an idling issue I had with my 92 Lx 5.0 and it did the trick. Hard to find item and well worth the money if you have a cam or just want that perfect idle this may solve your idling issues.

    Yes, I would recommend this item to a friend!


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    5 Stars   Great product, but clean off the loctite.
    By on 8/21/2014
    I just installed this to help cure my cam-induced idle issues. My only word of warning with this is that the longer bolts supplied come with thread-locker pre applied. When I tried to remove the plate again I ended up twisting off one of the bolt heads and nearly did the same to the other. I had to use vice-grips to get the rest out, which was also nearly impossible. The threads in my Holley aluminum TB were slightly galled, but not to the point of needing repair. I don't see a reason that one would assume that this is a permanent install, so I would recommend cleaning off the thread locker first, and/or using "blue" thread locker if you must.

    As for the functionality, I like that I can fine tune the idle without messing with the throttle plate. I did find that removing the plug in the third crossover port was necessary for my setup if the TB plate is to stay completely closed (normally only used in the 351), but luckily it comes out easy and can be reinstalled in a couple of minutes if needed.

    Yes, I would recommend this item to a friend!


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    5 Stars   great fit and easy adjustment
    By on 4/16/2014
    Allowed me to adjust air flow with ease. My car is supercharged so finding something that allows me to do this easier is always a good thing. Quick install, affordable and made by well known 5.0 parts manufacturer.

    Yes, I would recommend this item to a friend!


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    5 Stars   IDLE AIR (IAC) SOLVED SURGE PROBLEM
    By on 5/15/2015
    WHEN INSTALLED CORRECTLY I WAS ABLE TO GET THE WHISTLE
    TO STOP COMPLETELY WITH OUT DRILLING A HOLE IN MY NEW BBK
    70MM THROTTLE BODY, THE (IAC) ADJUSTER WORKS ALMOST LIKE
    THE OLD FORD CARBS THAT HAVE THE TWO IDLE MIXTURE SCREWS
    THIS ADJUSTER IS NOT JUST A FORD CARBON BUILD UP FIX, IT ALSO
    HELPS TO CORRECT POOR IDLE CONDITIONS, AND THAT AFTERMARKET
    THROTTLE BODY WHISTLE BLUES! THANKS LATEMODELRESTORATION

    Yes, I would recommend this item to a friend!


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    5 Stars   Eliminated an intake track whistle caused by 70mm throttle body.
    By on 9/28/2015
    70mm Throttle body throttle plate had no bleed holes, caused a whistling noise in my Edelbrock Performer RPM 2 intake, this solved that problem and helped with adjustability. Still not ideal - but I need a retune - too many changes that the stock computer just can't catch up too..Solved that damn whistling though...And real happy about that!

    Yes, I would recommend this item to a friend!


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    1 Stars   adjuster screws leak air
    By on 4/3/2017
    I bought this and was excited to install it. The adjuster screws leak air unless they are screwed mostly in. The threads seam to be too loose. I emailed LMR twice but received no response. i could seal the threads on the adjustment screws but then they aren't adjustable so i may just take it off. Wasted my money.

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    5 Stars   Finally I have an idle!!!
    By on 4/22/2014
    After a month of trying to get my 88 GT with aftermarket cam, throttle body, MAF, cold air intake I can finally idle this car with no problem. Even on a cold start!!! Recommended!!

    Yes, I would recommend this item to a friend!


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    5 Stars   Bye bye whistle, hello perfect idle!
    By on 9/12/2016
    Image uploaded by Michael S. I bought this mainly because I had a whistling idle circuit on my 70mm throttle body, the car sounded as if it had a vacuum leak at idle, but it didn't. This gem of a plate not only immediately stopped the whistle, it allowed me to directly control air/ fuel ratio at idle. My car now holds a perfect 900 rpm idle (e303, 1.7 rr, .528 valve lift). This is the best $45 (it was on sale) I've ever spent!

    Yes, I would recommend this item to a friend!


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    5 Stars   Solved my problem
    By on 5/10/2014
    After installing an e 303 cam I had a hard time making the car idle like it should after installing this product the car idles at a constant rpm with no issues. Couldn't be happier and a must if your gunna run the E cam

    Yes, I would recommend this item to a friend!


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    5 Stars   1990 Mustang came back to life!
    By on 9/17/2016
    Image uploaded by Duncan G. Had horrible idle surging and tried everything with no luck. Installed this with no adjustments and my idle is perfect and I can feel a difference at the wheels! Thanks LMR!!

    Yes, I would recommend this item to a friend!


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    5 Stars   More Air
    By on 3/23/2016
    This simple product is a life saver. tried everything and couldn't figure it out. This really allows you to dial in your idle issues Thanks LMR.

    Yes, I would recommend this item to a friend!


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    4 Stars   quality ford product
    By on 9/7/2015
    My big cammed 347 had an idle fluctuation problem. Now i can idle at 800 rpm and enjoy that lopey cam sound!

    Yes, I would recommend this item to a friend!


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    5 Stars   Easy Fix
    By on 5/31/2017
    Easy install the IAC needed some help

    Yes, I would recommend this item to a friend!


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    5 Stars   Works great easy install
    By on 4/4/2016
    After experiencing the surging idle on my 331 stroker I saw a few write ups some saying it works others saying its a waste of money . I was skeptical that this was going to work , took a chance and it worked idle is better than ever you get decent amount of adjustment from it. I had to adjust my idle because just installing the plate bumped my idle up a decent bit and couldn't adjust it down enough with the plate so just don't forget to adjust TPS if you play with your idle screw, also saw a lot of people who didn't know which way it installs so the screws face upwards but it is self explanatory if u look at the plate and the iac only one way that makes sense

    Tim

    Yes, I would recommend this item to a friend!


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    5 Stars   AWESOME PART
    By on 8/5/2017
    I did not buy this to fix an idle problem since i did not have one. I bought it because some reviews stated it solved the horrible TB whistle.
    IT DID !!!
    So happy with the best $50 purchase I ever made.
    Thank you so much LMR
    Thank you to the reviewers also. Reviewing products is important, good or bad feedback can be the best salesperson for online purchases.

    Yes, I would recommend this item to a friend!


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    1 Stars   Idle air control valve
    By on 9/3/2017
    Purchased this after experiencing idle problems with 1987 5.0 mustang intake upgrade to GT 40 and throttle body whistle. Very disappointed. Loosen up the screw for idle adjustments and they leaked air very badly. Then one of the set screws wouldn't adjust. Had to remove and use vice grips which ruined the set screws to get it out.

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    5 Stars   FIXED MY HEADACHE IDLE PROB!
    By on 9/16/2017
    So I had a terrible idle at start up. I would have to turn key about 4 times to get it to idle right. I bought this and installed in less than 10 minutes. Started right up and with a little adjustment it now has perfect idle. Thank you LMR!! A must have if you have any idle problems.

    Yes, I would recommend this item to a friend!


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    3 Stars   A must!
    By on 3/23/2016
    Bought this to complement the IAC I purchased and man! It's totally a no brainer. Got my idle just like I like it. My Fox is now purring like a champ!

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    Vehicle Applications

    Ford Mustang - 1986 (86) - 1987 (87) - 1988 (88) - 1989 (89) - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93)


    About This Brand


    5.0 Resto
    5.0 Resto - Dedicated To The Preservation Of The Fox Body Mustang
    5.0 Resto® specializes in restoration and specialty parts for 1979-1993 Ford Mustangs. Using years of experience in the late model Mustang restoration and aftermarket industry, 5.0 Resto® is your source for anything Fox Mustang. While designing, and manufacturing several items such as 5-Lug Conversion Kits, weather stripping components and interior restoration items, 5.0 Resto® also uses many other name brand suppliers to provide problem solving products directly to the Fox Body Mustang community. As with any part branded as 5.0 Resto®, they stand behind all of these products to the fullest extent and have tested these products to ensure they live up to the quality and performance you have come to expect!

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