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
Check out the full 1988 4Runner restoration series here: https://youtube.com/playlist?list=PL1NE_MkjB9D_ku4m86axv6BIc405CeW-b
Parts I used:
Throttle body gasket: https://amzn.to/3jfUIyQ
Throttle body / Carburetor cleaner: https://amzn.to/3jfUIyQ
1988 Toyota 4Runner 3VZE
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I made special tool to unscrew IAC valve on my 3vze…But could never unscrew it all the way. It felt like it was turning the spring inside and would break it. I adjusted it inward a little after not being able to remove it and then the truck would only idle at around 1200 at cold start which means it takes forever to warm up. So I adjusted it again back out. I still only get cold start idle at about 1300.
I also have slightly high idle at about 950-1000 and idle adjust screw is all the way in.
Thank you so much for your posts! Very helpful. Have ever played with the TPS and adjustments?
PS your a good son…….
Hi I have a 88 4Runner that has the same problem but it's been resting for a few due to a lack of $$ it's time to get back on the road first thing in fast forward it's hard to know what you are doing and you don't explain as much as I need but a fantastic job!!
.? Why did you not send out the block to do a complete redo ? Cost ? As you said that the rings were passing air ?
I wish I could send you my 4Runner and. Lot of cash to fix it for me.
A new fan
JoP
I have 500 rpm, I tightened the bolt as much as possible, so it consumes less fuel.
Tu video excelente. gracias el pude reparar mi 4runner 1992. y gracias a que te paso lo de el humo yo no me espante cuando me ocurrio a mi. Saludos desde Tijuana Mexico.
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.
Where you get your skills Practical Enthusiast? Impressive. Glad I subscribed to your channel. I have a '86 4Runner SR5 I've owned since '88 and perform my own maintenance. Keep those educational videos coming!
I have a question regarding the IAC. I have a 2003 Toyota RAV4 that sputters when I first start it up and the outside temperature is below roughly -25C (-13F). Would an IAC that sticks shut cause the idle to drop far enough for it to begin sputtering (like it's running too rich)? I hope you read and respond to this, it would be greatly appreciated 🙂
My last vehicle was a Pickup with the 3vze, had the same issue, I'll bet this would have solved the issue for me!
Do you need to bleed the coolant system after disconnecting those coolant lines?
I'm so glad you found this before I had to go searching for it on mine. Now I will know when I fire it up. Thanks man!!
Looks like we’re gonna see more 3.SLOW content huh? I love it
SO THAT’S WHERE THE IAC VALVE IS AT? I’ve been trying to figure out where the hell it is cuz I was watching a ChrisFix video about IAC valves. Definitely gonna keep this in mind when I do work on my 3VZE again
Sometimes those bypass pipes are plugged does not allow hot water flow…
great content as always!
Great work..so what else does you Father's 4 runner need? You got just about everything covered. ☺
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.
This Toyota is the gift that keeps on giving you things to fix.
Sgt Roos, John T. (Ret.) Am I the 1st? Semper Fidelis