Toyota 3VZE | Ep.9 | High engine idle speed EASY FIX!

How to properly and permanently fix a high idle speed on a Toyota 3VZ-E 3.0 Liter V6 engine for basically FREE. I haven't seen this DIY anywhere on the internet, so here it is!
It's all in the Idle Air Control Valve. IACV IAC

Parts I used:

1988 Toyota 4Runner 3VZE

[MrLibertyordeath]

Bro. You win the YouTube award for best presenter without over explaining. Excellent video.
I pulled over in my way to work to say this 😂👍🏻

[Darthvolvo]

This Toyota is the gift that keeps on giving you things to fix.

[wilfredneumann]

Just tried this on my 1991 Toyota pickup and it fixed my problem! Went from an idle of 2000 to around 800-1000

[donhuff]

Hi, I plugged that hole in the throttle body,
it worked, solve ALL my idling issues. I shut
The hood. Thanks.

[danking]

Just finished the IAC cleanup and readjust on my 1990 4X. Road test, no code 25 and it runs SO much better than before. You are the BEST.

[RossWilliamsDC]

Perfect. I have the same issue with my '90 3VZE and I am just getting ready to replace the valve/head cover gaskets so a perfect time to do your tape test. Thank you. cheers.

[supercharged]

Thanks for the clear informative video. ' I have had a high idle problem and was going to get a used throttle body. I now know how to fix my 180, 000 mile high idle problem on my 93 4Runner.

[floydrturbo]

Excellent detective work and "proof of concept". I have a '91 pickup with the same problem that owner abandoned on his father in laws lake property 8 years ago. Because he didn't register timely when he moved from NY to Canada he was in violation. He could not drive it legally (especially since he was a lawyer). The FIL said I could have the truck if I hauled it away after I delivered his sailboat from Florida. I rented a uhaul and trailered it back to Atlanta after 4 hours trying to load because it wouldn't shift out of park. I jumped the battery off my Dodge diesel to see if that would help and it started to my amazement. It still wouldn't shift but my son disconnected that part of the mechanism when I got back to Georgia. Luckily, truck was from California and wasn't a northern rust bucket (yet).

[sherryjohnson]

I deleted the egr system removed all the unessary vacuum lines I has just have what’s needed and bumped the timing boy what a difference in power

[Ifitfitz]

My dad found your video after having issues for weeks, I had told him it was likely something to do with the coolant because it was primarily a warm up idle issue. There actually wasn't an issue with this valve, however your test did narrow down the problem and when we got everything apart we noticed the line going to this valve was near 100% blocked, so a few squirts of carb cleaner and a little shot of compressed air got it it tip top shape again. He said he went to say "thanks" and didn't have an account set up so he asked me if I could send a monetary thank you your way. Great job man!

[chriscollison]

You are very attentive and that’s refreshing cause it’s all too often that “oh well it’s good enough” is thrown around nowadays and it drives me crazy! If your gonna do something do it right and have some pride! Awesome videos man! I’m guessing you live in a state you can’t get rid of the EGR and Pair valves cause it makes these 3.0s run so so much better! I also got rid of all the hard lines under the intake and ran the coolant hose from the top inlet to the metal u joint in the back of the engine bay and just cut the u to a straight and added the G-force silicon layered hose kit! But man you do good work!

[CopeManMTNDEW]

Awesome video. My 3vze is doing exactly this. I thought it was odd I had a good rpm setting one day and now it just feels like it stays in cold high idle. I checked for vacuum leaks and all vac lines are not leaking. I'll definitely give this a shot.

[GaJeepr]

Great update on the 4Runner. One of my issues that makes me sometimes hesitant on pre-90's vehicles. Unless they are popular ( and have a huge and active owners group....including a very active internet forum for example ). Figuring out quirky stuff like this can be a PITA. Then when one of those parts totally fails or is just becomes
worn out finding the part can also be fun ( and/or expen$ive ). But this series does make me miss one of my first project/flips...a 87 4Runner. It was a very unique transformation.

[michaeljones]

I have an Accord that was doing exactly this. Your theory is sound cause I did exactly this and it resolved the issue.

[kode]

This was such a big help on my 95 4runner. Thank you!

[calebschneider]

My last vehicle was a Pickup with the 3vze, had the same issue, I'll bet this would have solved the issue for me!

[SiteReader]

Brilliant video! Everything explained perfectly, and problem solved. I just finished major work on the 1MZFE on my '95 Avalon. Replaced anti-knock sensor harness (requiring air plenum and intake manifold removal), rear bank valve cover, and plugs, plus a couple of age-embrittled items that broke while servicing. It all came back together, miraculously, and engine runs great with much more power. BUT now has high fast and slow idle. 

I read a lot of "solutions, " but yours looks like the right one. I'm going to drive it a few days to see if the ECU "relearns" the right position, as some suggested (though I'm skeptical whether this model year even has that feature). Then I'll try your fix. BTW, that wax-filled plunger on the Intake Air Control valve is the same type of mechanism as the zone valve I recently replaced on my hot water heating system. It's a tried and true system going back over a century. You're the first YouTuber who has explained how it works on the IAC. Makes a lot of sense that the one on my Avalon may have tired a bit in 27 years. It's probably just age-related wear on the spring. Thanks again for great video!

[BlutoO]

Hey my friend thank you ! 1989 3vze it had the same problem ! I saw your video and it fix the high idle ! But now it has hard starter!

[joshm]

The only time I've had a high idle on my 94 Pickup 3vze was when the Throttle Position Sensor went out a little after 200k miles. All the little vacuum lines have held up luckily even being an Arizona truck. It's been the larger rubber emissions lines I've had to replace and some coolant lines just as a precaution. Looking forward to seeing more of this 4Runner. I have an 87 but it's got a 22re in it.

[SeanKStephens]

I'm glad I looked this up. I had concluded that idle screw had no real purpose.