95 fzj80 with 230k miles. I have owned if for about a year. I notice that whenever its warm outside 70 degrees plus, that my rig will idle really high (close to or at 2k rpm) after the engine itself has warmed up. It doesn't do this during the winter even if the engine is warm. It also does the same thing if Im at higher elevations even if it is cool outside. I live at 6k feet, but often go riding in the mountains from 8-10k. Everything else with the engine runs great, no CEL or anything. I did have a CEL after I bought it and after replacing the VSV and the vacuum modulator to a blue top there hasnt been a CEL, that was about 7-8 months. I havent really even tried anything yet just trying to start with the most likely culprits first, and the wealth of knowledge in the forum is amazing so I thought I would ask you guys first. Thanks in advance.
High idle when warm outside
- Thread starter jrpitdog
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
The remedy is to replace it with an OEM one. (Cable) Don't do the Rock Auto or other aftermarket versions. EVERYONE that has bought one has griped about it.
Toyota Parts | Toyota Online Parts | Genuine Toyota Parts | Toyota Parts Online
A couple other things that MAY be culprits because you mentioned after it was warm:
Temp Sensor
O2 Sensors
IAC Valve
Do you have high pressure in your fuel tank at those elevations? If so, you may want to address the charcoal canister and replace it. That can affect the IAC valve also.
is the AC on when it is warm? just saying...... 
is the AC on when it is warm? just saying......
..........exactly where my lil’ brain went.
‘95 was all manual climate control equipped, so are you SURE the A/C & recirc buttons are off?
Cycle the system a few times too - don’t just rely on the button light.
From there if you can 100% bank the climate control is working right, I’d be checking the compressor sensor too.
After that, the choke function of the 1FZ.
- I haven’t had any of mine go yet, so I’m not experienced in how the 1FZ chokes itself.
But the bump in RPM’s sounds like a A/C compressor function IME, as little as I run mine here (heck, I use it to defrost more than Summer heat issue).
Just had an afterthought - how’s your air elbow?
The big rubber tube from the AFM to the throttlebody - pull it out, wash it in the sink & look at all the accordion/ flex zones for cracking.
90% of idle issues are now at this age going to be due to material breakdowns like that. That huge rubber has 20yrs & lots of heat cycles on it.
It’s a $80-100 part at the dealer if you find a crack in the elbow, and you could “fix” it with duct tape to confirm if you need a new one.
I actually feel dumb not mentioning it in my original post, but I don’t edit my crap because I own all my good posts & my dumb ones too.
- If I edit I say so on those posts.
The big rubber tube from the AFM to the throttlebody - pull it out, wash it in the sink & look at all the accordion/ flex zones for cracking.
90% of idle issues are now at this age going to be due to material breakdowns like that. That huge rubber has 20yrs & lots of heat cycles on it.
It’s a $80-100 part at the dealer if you find a crack in the elbow, and you could “fix” it with duct tape to confirm if you need a new one.
I actually feel dumb not mentioning it in my original post, but I don’t edit my crap because I own all my good posts & my dumb ones too.
- If I edit I say so on those posts.
Choke? Not on a fuel injected vehicle. Could be a problem with the IAC - Idle Air Control
AC compressor switching on would not raise the the idle to 2K RPM.
Most likely a sticking throttle cable as @ajax1 has suggested.
- Thread starter
- #9
Its definately not the ac. I have confirmed that, it idles a lot higher than when the compressor kicks on. Its really strange because like I said its only when its hot outside or at high elevations, a warm engine alone has no issues. I do have venting when I take off my gas cap. I have never had the spewing gas or anything, the most it ever vents might be a couple seconds. I plan on going through the vapor canister and related hoses, looking at the IAC and maybe cleaning the throttle body and probably replacing the throttle cable.
Having the exact same issue with high idle when engine is hot... just stripped and cleaned the throttle body, bypassed the EGR, cleaned the IAC, tested the TPS only to realize after reading this post that its a sticking throttle cable !! More cash to spend on the fun stuff now lol.