Car Stalling or Rough Idle - Cleaning the IAC Valve (Idle Air Control)

[Tools/Parts]
Cleaning products (Throttle body cleaner or intake valve cleaner or carb cleaner): https://amzn.to/3cjS1uu
Brushes (Toothbrush or pipe cleaner etc): https://amzn.to/39nLxJ6
Optional: Ford Motorcraft CG758 IAC valve gasket (Ford Mustang 1984-2012): https://amzn.to/3aeuo3E
Optional: IAC Valve Assembly Ford Motorcraft CX1785 (Ford Mustang 2002-2004): https://amzn.to/3cePhP7

[Misc Tools]
Metric Wrench Set 8mm - 22mm: https://amzn.to/2xQn3ot
Socket Set 123pc Metric and Imperial - Good Quality: https://amzn.to/2NhqhL9
TEKTON 4966 3/8-Inch Drive Impact Extension Bar Set, Cr-V, 3-Piece: https://amzn.to/3byEkEo

Part Numbers:
CG758, E83Z9F670A, G31324, E7TZ9F670A
AC568, 2R3Z9F715EA, XR3Z9F715BA
CX1785, 2R3E9F715AA, 2R3Z9F715AA, F539E857AA


Car Stalling or Rough Idle - Cleaning the IAC Valve (Idle Air Control)
The car in the video is a Mustang GT 2003 V8 4.6L. However, the procedures shown in the video will apply to most vehicles and applications.

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#IACValve #IAC #StallingAtIdle


[Idle Air Control Valve / Air Bypass Valve / IAC actuator / Idle Air Control actuator]
Car stalling at idle? when stopping or slowing down?
An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed (RPM). So typically when the accelerator pedal is UP and the car is idling! When the accelerator is pressed, the throttle plate opens which allows air into the engine, that is why you wont have these symptoms when not at idle. When the throttle plate is closed, we still need a way for air to get into the engine otherwise the car will stall! This is where the IAC Valve comes into play! The car's computer will tell the valve to open 'enough' to allow 'enough' air to bypass the closed throttle plate to maintain a steady idle. Easy!
In carburetted vehicles a similar device known as an idle speed control actuator is used. Check your car has one. Electronic throttle body's do not. In this case, it might be something like a vacuum leak.

[Valve Actuator]
A valve actuator is a mechanical device that uses a power source to operate a valve. This power source can be electric, pneumatic (compressed air), or hydraulic (the flow of oil)
Examples: A choke aka the butterfly flap in a carburetor, Idle Air Control Valve etc

[Symptoms]
Rough at idle (sticking in a closed position)
Stalling at idle (sticking in a closed position)
RPM hesitation at idle (sticking in general)
High RPM at idle (1500rpm on start, 800rpm when warm aka after 2 minutes) (sticking in an open position)
When an extra load is placed on the engine, the RPMs can fluctuate or the engine can stall (AC compressor, auxiliary components, power steering etc)

Usually it's because the valve is gummed up with carbon deposits.

[Rule]
Idle Air Control Valve stuck open = high idle = allowing too much air to the engine
Idle Air Control Valve stuck closed = hesitation/stalling = Not allowing enough air to the engine

[Location]
Find the air filter (For air coming in). Follow the intake tubing from here. The Idle Air Control Valve will be at the other end of the intake tube (as it allows air to the engine from the intake tube!)

[Cleaning]
1. Keep motor upwards! This way our cleaning products won't enter our motor.
2. Try to move the internal valve manually (to confirm it's stuck)
3. Clean it! Use brushes to help
4. Make sure it's fully dry before re-installing




Video Title: Car Stalling or Rough Idle - Cleaning the IAC Valve (Idle Air Control)

Video File Created Date: Wednesday, 27 January, 2021 (Video may or may not have been captured on this date, it shows the date the video was last converted.)

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Video Tags:
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