High / Low Idle RPM fix - IACV cleaning (Toyota Rav4 1.8L 1ZZ-FE 1999-2005)

▶ PLEASE NOTE: at 4:11, the screw info shown is not correct. The screws are metric M4 and M5, I'm not sure how I ended up writing that nonsense that you see in the video.

This video explains the cause and fix for too high or too low idle RPM problems on Toyota Rav4 1.8L 1ZZ-FE petrol engines on models made in 1999, 2000, 2001, 2002, 2003, 2004, 2005. The component responsible for these issues is the Idle Air Control Valve (IACV), which I show you how to remove and clean.

Although the process will be different, the same procedure may also apply to other similar engines like the 2.0L 1AZ-FE, 2.4L 2AZ-FE, and to other cars that come with these engines, like the Toyota Corolla, Celica, Avensis, Camry, Echo and some Lexus models.

𝐋𝐈𝐍𝐊𝐒 𝐅𝐎𝐑 𝐏𝐀𝐑𝐓𝐒 (𝐍𝐎𝐓 𝐀𝐅𝐅𝐈𝐋𝐈𝐀𝐓𝐄𝐃)

▶ IACV valve (part no. 22270-22060):

[eleuterioramalho]

The video is very good, excellent technical level. it is wrong to lubricate the o-ring with this oil. the o'ring rubber will degrade, try something else, silicone the same problem with the brake disc caliper boot

[ptru]

It had been a long time since I had seen a video with a high quality of information without any kind of meanness, this is the essence for which the internet was created. Very good video man and thank you very much for sharing!

[andynikolic]

Thank you man, just finish doing this job today, took the car for a drive and sounds like brand new. Such a nightmare has been, three mechanics since the beginning of January, and no error codes, no one knew what it was... did this and voila!! Thank you so much!! Btw, my issue was high revving after changing the PCV valve.

[chandamwila]

Very informative. Followed all instructions for my toyota wish, 1zz engine and found the valve stuck. Cleaned it. The problem was solved permanently just like that.idle is now perfect as if the engine has just been released from the manufacturer.thumbs up sir.

[ramishrambarran]

Excellent !
Couldn't have had a better tutorial.
I have an imported JDM 2003 Toyota Corolla Fielder wagon with a 2ZZ-GE engine. There are others with the 1ZZ-FE and 1NZ-FE engines also.
(It is less work to remove my throttle body, than it is to remove yours)
Our country has bumper to bumper traffic, so life is very hard on the throttle butterfly and its shaft in continuous stop-and-go traffic. My car is doing 235, 000kms !
The idle RPM slowly climbed up this year to about 1300RPM. In some situations I used to remove my foot from the accelerator as the car went on its own, tipping on the brakes to slow dangerous situation indeed !
Removing the throttle body, and holding it up to bright light revealed spaces between the butterfly and the throat of the throttle body, especially on the cable-quadrant side. Backing down the idle screw did not spaces were there !
Yes, there was wear. Wear means more air, means higher RPM.
I was fortunate to find a used throttle-body in my country. (We have an active Japanese Used-parts industry)
There was no light filtering through the throat when held up.
I did "hammer-and-chisel" the three IACV screws, then got new Philip ones for re-assembly.
The two electromagnetic actuator "petal" screws were slackened with a pair of giant pliers. New Philips ones for re-assembly.
I used the same procedure you did for cleaning and re-assembly. (I am 68 and knew Singer machine oil as a boy)
Upon re-installing and securing the throttle-body and starting the car, I still got a 1400RPM idle.
The electromagnetic actuator screws were slackened, and it was turned anti-clockwise. The idle dropped.
Yes, the screw holes on the electromagnetic actuator are elongated to give about 10 degrees of turn. Clockwise to speed up, anti-clockwise to slow down. This augments the function of the idle-screw.
I have my engine idling now at 800RPM.
No more issues. I found out everything by trial and error over an extended period.
Great video for those of us who did not know.
The Toyota part number for the IACV gasket is 22215-7A680

Thank You.
Trinidad & Tobago.
West Indies.

[abobobilly]

Very very useful and helpful. Surprisingly I haven't been able to find such a tutorial on 1zz engines. Everyone keeps talking about Throttle Body Cleaning but none has talked about the ICAV. I'm going to try this on my celica 2000 with 1zz. I had cleaned the MAF Sensor, Air Filter, and Throttle Body from visible side only (which might've been a mistake as the car now is smoking a lot constantly). The idle seems stuck forever at 2.5k RPM and no matter how low I adjust the Idle Screw, it doesn't come down.

[thayax]

Fantastic, You have Saved Me My Invaluable time and hundreds of pounds. Pointed out the problem to my mechanic - showed this video to him, he removed, cleaned and fixed it back. RPM dropped from 2000 to 700 now.
Happy Driver :) ThayaX - Harrow, London, UK

[patrickphippspa]

Awesome video! I see others have made comments that I may have made but no need to duplicate that. Instead, I'll just thank you for such a high quality effort. OUTSTANDING, and thank you!

[MarzNet]

A truly excellent how to video packed with good, accurate information. I have a 2006 Matrix (1ZZ-FE) with 223, 000 miles in which the idle comes down fine after startup, but is starting to occasionally drop to 500rpm. Might be time to service IACV. Also, using an xtool scan tool, I plotted RPM and IAC duty cycle, which responded perfectly to pedal snap (duty cycle increased momentarily). I think it is starting to get stuck when rotary valve is closer to closed position.

[NSAjREkLaw]

SO grateful for your effort mate, I've been trying to sort my 03 toyota echo stuck on 3000rpm. The car had been sitting for months and wouldn't start because of it being stuck but just took it off and sure enough it was seized up. So thank you very much 🙏🤙

[matti]

Amazing, Your explanation and the steps including the video perfect. Thank you for the tutorial. I hope you post more.

[mainsfortes]

Great quality. Such wonderful detail The kind found only in the best technical schools. Thanks

[stanleypeter]

Perfectly clear and understandable. Nice one

[the_realJP_]

I have a 2002 Corolla with the same engine and similar idle issues. I am hoping that a good cleaning will help. Excellent video 👏

[workingprinciples]

Great to find your reply that shows this IAC valve is not equipped with bimetallic spring, then kindly explain IAC valve connection with ECM.

[albecane]

Excelente video, muchas gracias y un gran saludo desde Argentina

[roughas]

Excellent video, had the same problem in my Corolla, same engine . Only thing I did different to remove the 2 anti tamper screws ( for the valve step motor ) was to cut a slot in the head and use a flat head screwdriver to remove them . I cheaped out with the gasket too, just coated the old one with some sticky brown aviation gasket sealant. Anyway yeah the little car runs normally again, no more annoying 1800rpm idle

[omarfongvillarreal]

FIRST OF ALL, GOOD VIDEO AND VERY EXPLANATORY. GREETINGS FROM PANAMA.

[thevanvirgin]

Thank you brother! Excellent teardown, gonna take this and apply it to my 3zzfe. Close cousins!
EDIT
Well that was short lived. I have an electronic throttle which seems to have a different IACV scenario. My journey continues.

[MarzNet]

Cool. Another thing to check on these engines are intake manifold air leaks and oil leaks at the valve cover, vvt solenoid, and tensioner.