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Subaru Impreza Idle Air Control Valve Replacement

An idle air control (IAC) valve is responsible for controlling the engine idling speed and the cost of replacing one varies depending on the year, make, and model of your car.

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Subaru Impreza Idle Air Control Valve Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Subaru Impreza Idle Air Control Valve Replacement is $438. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.

Car
Location
Quoted on
Price
1997 Subaru Impreza
1.8L H4 Brighton • 122,000 miles
Burbank CA 91501
Nov 15, 2020
$395 - $483
2014 Subaru Impreza
2.0L H4 NULL • 85,000 miles
Fresno CA 93650
Nov 14, 2020
$388 - $474
1999 Subaru Impreza
2.2L H4 L • 66,000 miles
Pollock Pines CA 95726
Nov 4, 2020
$408 - $498
2007 Subaru Impreza
2.5L H4 Turbo WRX STI • 165,000 miles
Elk Grove CA 95624
Nov 2, 2020
$386 - $472
Last Updated:
Dec 15, 2020 8:45 PM
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What is an Idle Air Control Valve?

A four-word car part might sound confusing, but hang in there. You can keep up, I promise. An idle air control (IAC) valve is responsible for controlling the engine idling speed. See? Told you it was simple. The engine control module (don’t worry, this is just fancy speak for computer) supplies voltage to the IAC valve, which causes a pintle or rotary valve (depending on the car) to move in and out, adjusting airflow. More air means a higher idle. Now, your car might not have an IAC valve, as most modern cars have moved on to electronic throttle bodies. So if your car doesn’t have an IAC valve, you can skip this info. I promise you, it won’t need an IAC valve replacement if it doesn’t have an IAC valve.

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Symptoms of a failing Idle Air Control Valve

Bad idles

Okay, ready for some news that will knock your socks off? If the IAC valve, which is responsible for controlling the engine’s idle, isn’t working...the idling might not work right. If it feels like your car is idling too high or too low, there’s a good chance your IAC valve is the guilty party.

Poor engine performance

I get it. You might not notice when the idle speed is off. That’s understandable. But you better notice when the engine isn’t performing well. Surging and jerky acceleration is a sign of an IAC valve that’s not up to the task. So is stalling, and, in more extreme cases, a car that won’t even turn on.

Check engine light

Oh, you didn’t want to see this listed as a symptom, did you? I get it. You don’t pay attention to the check engine light. You think it’s meaningless, because it’s small and harmless looking. Spoiler alert: it’s not meaningless. Something’s wrong with your car, and it might be the IAC valve.

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How urgent is replacing an Idle Air Control Valve?

It’s not great to ignore an IAC valve that is malfunctioning. Your car won’t perform well, and you might get stuck with a car that won’t turn on, or will stall every time you’re at a red light. Not ideal. But not really a safety hazard either, and driving around with a busted IAC valve typically won’t put your engine at risk of further damage.

So get the IAC valve replaced, but no need to leave your friend’s wedding to do so. Unless you need a good excuse to get out of there.

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