How to Clean an Idle Air Control Valve | YourMechanic Advice

How to Clean an Idle Air Control Valve

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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.


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Recent Car idle is rough Inspection reviews

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YourMechanic Car idle is rough Inspection Service

Average Rating

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Number of Reviews

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Rating Summary
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Raymond

26 years of experience
39 reviews
Raymond
26 years of experience
Ford Focus - Car idle is rough - Victorville, California
Raymond explained what was going with my car . Good to no. Raymond is a good mechanic that’s why I called him back to check Out my other car.

Luis

21 years of experience
72 reviews
Luis
21 years of experience
Chevrolet C1500 - Car idle is rough - Round Rock, Texas
Actually called and said he could come earlier which worked out great for me. He diagnosed my truck and showed me everything he did and was very courteous and answered all my questions. I would definitely recommend him and will request him again.

Robert

39 years of experience
35 reviews
Robert
39 years of experience
Chevrolet Impala - Car idle is rough - Phoenix, Arizona
Mechanic was nice and explained everything to me that needed to be repaired on my vehicle and had good conversation

Michael

3 years of experience
31 reviews
Michael
3 years of experience
Ford F-150 - Car idle is rough - Noblesville, Indiana
I wish to thank you and your company for making this happen in such a timely manner. As for Michael, spot on professional. Very down to earth and breaks down the situation so that anyone can understand what is going on. While he did run a few minutes, it was due to a vehicle accident. Therefore, timely will be checked

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