Skip the auto shop - Our mechanics make house calls

How to Clean an Idle Air Control Valve

air control valve close up

The job of an idle air control valve is to regulate the car’s idle based on how much air gets into the engine. This is done through the vehicle’s computer system and then sends the information to the components. If the idle air control valve is malfunctioning, it will cause the engine to idle rough, too low, too high, or irregular. Cleaning the idle air control valve on any car equipped with this valve, is fairly straightforward.

Part 1 of 2: Prepare for the job of cleaning the idle air control valve (IACV)

Materials Needed

intake manifold

Step 1: Locate the IACV. It will be positioned on the intake manifold along the rear by the throttle body.

intake hoses connected to throttle body

Step 2: Remove intake hose. You’ll have to take off the intake hose from the throttle body.

Part 2 of 2: Remove the IACV

person pointing out negative terminal in the battery

Step 1: Disconnect the battery cable. Remove the cable that goes to the negative terminal on the battery.

Step 2: Remove the screws. Take off the two screws that hold the IACV in place.

  • Tip: Some automakers use soft head screws for this part, so you’ll want to be careful not to strip them out. Use the correct size screwdriver for the best fit.

Step 3: Disconnect the electrical plug. You may have to squeeze on it to get it to loosen.

Step 4: Remove all other plugs from the IACV. You may need to use a screwdriver to loosen the clamp on one hose.

Step 5: Take the gasket out. Throw it away after verifying you have a correct replacement gasket.

person spraying carbon cleaner

Step 6: Spray carbon cleaner. Spray the cleaner in the IACV to remove dirt and grime.

Use a clean cloth to carefully wipe away anything that remains.

Repeat the process until no more dirt and grime come out of the IAC.

  • Warning: Make sure to follow all safety precautions for using the carbon cleaner spray.

Step 7: Clean the IACV passages on intake and throttle body. Allow the gasket surface to dry before putting the new gasket on.

Step 8: Connect the hoses. Connect the last two hoses you removed and put the IACV in place.

Step 9: Attach the IACV. Attach it with the two bolts.

Reconnect the plugs and coolant hose. Reattach the negative battery terminal after everything else is in place..

Start the engine and check IAC operation.

  • Tip: Don’t start the engine while the idle air control valve is out.

You should notice your engine runs more smoothly with a steady idle. If you continue to notice rough idling, talk to a trusted mechanic such as one from YourMechanic, to diagnose the problem. YourMechanic has a dedicated team of mobile mechanics who provide convenient service at your home or office.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...


Related questions

Q: If the air is too cold, motor knocks on startup

As strange as it may sound, the oil filter that was used during one of your oil changes may be the root cause. GMC Technical Service Bulletin (TSB) 10-06-01-003C has detailed technical information showing that some non ACDelco oil filters...

Q: How do I clean the interior?

Keeping the interior of your car clean is important, but it’s not hard to do. The most important thing is to stay on top of it, as dirt, dust, and debris can build up in a surprisingly short amount of...

Q: What Is Engine Displacement?

Engine displacement is the total volume of an engine's cylinders added together. To figure out the engine’s total volume displacement, you would need to know the bore, which is the diameter of each cylinder, the stroke, which is the distance...