High Idle (2k RPM)

[Ancient]

Hello all,

I am new to this page so please be kind to me. I am in the process of fixing up my FJ80 (94) and came across an issue. Recently I have been experiencing high idle and I cant seem to pinpoint the issue.
Things I have done: Replaced IAC & TPS
Clean throttle body
Clean MAF and sensor
Check for Vac leaks and inspected ports
Smoke test (no leaks)
Throttle cables are new with slack

I am out of ideas. Would like to try the repair this myself without bringing it to a shop.

 

[Kernal]

What rpm's did it idle at in the past, engine warmed up?

Did the high idle start suddenly, progressively get worse over time, after maintenance or??

 

[Fj80oregon]

You have a Fzj80
Read this one

Thread 'High Idle! Fzj80 idles at 3,000 RPM??'

Jan 28, 2015

Hi, thanks in advance for taking a look and for your advice. I have read every thread with 'high idle' in the title and have not found a solution.

1996 FZJ80. No mods. Has run great for the 800 miles in which I've had it, went wheeling (very light) one day and the next morning had this high idle thing happening. For the first day or so it would do that thing where it idled up-and-down between about 1500 and 2000. Then that gave way to just a straight 3200 Idle. Does not matter when the truck warms up, it will sit and Idle at 3200 all day long.
It drops down when I'm in gear but still...

• jbee
• Replies: 31
• Forum: 80-Series Tech

 

[Fj80oregon]

When searching use google type in your issue and ih8mud
94 Land Cruiser high idle fix ih8mud
I have heard the coolant temp sensor can cause this, how’s your timing?

 

[Ancient]

What rpm's did it idle at in the past, engine warmed up?

Did the high idle start suddenly, progressively get worse over time, after maintenance or??

It used to be at 1k when warm. One day it just started getting higher

 

[petegangies]

It used to be at 1k when warm. One day it just started getting higher

pull your EFI fuse for 10mins and see if it comes back down after a reset.

P.s 1k when warm is way too high. Base idle should be 650rpm (sometimes a tad higher, but nowhere near 1k).

This happened to me very recently, and coincided with a vibration from the a/c system. I replaced the a/c tensioner pulley and reset the ecu.

The idle was high, even when the A/C was off.

 

[Ancient]

UPDATE: So I ordered a new IAC because someone on FB suggested that the after market eBay ones were not correct. The part that is inserted into the valve system is bigger on the OEM spec versus the eBay spec. Here are the photos for comparison I ordered a new unit from Curiseryard and it worked perfectly!

So if anyone out there is having issues with high idle, I would highly recommend you make sure that the parts you install are the same size as the oem specs.