I have been plagued by high idle for a while now and after ruling everything else out I finally decided to replace the throttle body.
I would keep encountering high idle, anywhere from 1000rpm up to 2500 rpm. If I hit the throttle sometimes it would come down to normal. I could see the data on my scanner and the TPS would read 10.2 at normal idle and sometimes get stuck anywhere from 11-12.8%. There was a lot of play in the throttle body shaft and I could see where the butterfly was rubbing and getting stuck.
The proper TB for a 98 3.4 manual with cruise control (2221062210) has been discontinued by Toyota. It may be available from Japan for 1,250$ but that seemed ridiculous.
I ordered 22210-62230 which did not have the cruise control parts on the linkage. From there I just swapped over my old linkage, cruise control bracket and dash pot. My idle is now perfect and the TPS returns to 9.6 and every time.

 

Thanks for posting that #22210-62230 can be subbed in with a linkage swap, useful information to tuck away for possible future needs.

 

Yes that's definitely good info. I've been battling the same issue but I'm hesitant to blame it on the throttle body. I haven't posted a thread since there are so many "high idle" threads out there on Tacoma forums...I had a good idle, but as part of maintenance and chasing down poor mpg I cleaned the MAF, throttle body and IAC. After putting it back together, my idle was ~1,000 instead of 800. Bought a new IAC thinking I probably clogged it (and cleaning is not recommended by Toyota, though a lot of us seem to do it). Now my idle is closer to 2,000. I've had things apart multiple times, checked for vacuum leaks, there's a new throttle body gasket on, and still high idle. But it's weird, it'll be ~1,500 cold, then once it's warm, idle around 1,800. Sometimes at stop lights it's 1,300, other times 1,800, sometimes 2,000, all on the same drive around town. I replaced the TPS a few months back because it threw a code, so that ought to be good.

Anyway I guess it's possible that my throttle body is worn and built up carbon was masking the problem, and now that I have a new IAC and clean throttle body, the symptoms are showing up? I'm going to see how much play the butterfly has later today. I see that part you posted is $360 from McGeorge Toyota, which is something I can probably afford if I'm pretty certain it'll fix my issue.

 

Have you checked the o=ring on the Idle Adjust Screw? They get old, and brittle, and can shed rbber Pieces down into the air channels below the IAS.

Just a thought.
Pat☺

 

There was a fix for a worn barrel that causes the butterfly to stick that involved a washer. Not as good as a whole new throttle body, but a lot cheaper. It worked well enough for me until I found a nice tb at the junkyard.

 

I'll look into both those things, thanks! I remember seeing something about that washer trick years ago.

Idle screw...I'll have to look that up. And did you mean IAC? I can't find anything about an idle screw for my truck, aside from what's on the throttle cable linkage, but that couldn't get rubber into the IAC.

I didn't go OEM with IAC, but I got a better-reviewed aftermarket part that wasn't the cheapest out there. Who knows. I do still have my original IAC so I guess I should throw that back on to rule it out.

 

Oh, shoot! I apologize. I'm still thinking first gen, 22RE type stuff. I do apologize for my brain's lack. No, there's no Idle Adjust Screw any longer. I am really sorry about this...
Pat☺

 

There's definitely a small gap in my butterfly, but I'm not sure it's excessive.

Either way, in typical "me" fashion, I messed with a bunch of things all at once, in order to save myself from the knowledge of which one thing actually helped, but...I may have fixed it. I changed my oil, and while cleaning up around the oil filter, the engine ground cable pulled out of the lug connector. It was clearly just sitting there, not really attached. So I cleaned the connections, re-crimped it, and bolted it back on. I took off the throttle body, and put my old, original IAC back on. I sprayed electrical cleaner on all the associated throttle body connections.

I have yet to take it for a drive, but for the first time in months, after idling for a few minutes, it dropped below 1,000rpm. Something is definitely working right. I thought it was going to stall, it's been so long since I've heard it idle that low. I'll drive around tomorrow and see how things run.

 

No problem! You didn't steer me off course, you just sent me on a 5-minute internet search that didn't turn up anything.

 

I was always able to close the throttle by hand to get a normal idle once warm. It wouldn't go high untill I opened the throttle to the point it got stuck. I could also definitely see where the butterfly was hitting and getting hung up.
The new TB also comes with IAC and TPS mounted, those 2 parts are pretty close to the cost of the throttle body itself....
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Yeah no kidding! That's why I went with an aftermarket IAC. But maybe it was a bad call. My idle has settled back to where it was after cleaning my OEM IAC, before putting on the new aftermarket IAC. Right around 1,000-1,100. Way better than before, but still not ideal.

I may start saving for a new throttle body.

 

If you close the throttle by hand does idle go down?
Do you see a spot where the butterfly is wearing the bore like in the photo?
If yes, I'd say it's time to either shim and see if that works for a while or replace the TB.

 

I don't recall seeing wear like that. But yes, if I push the throttle linkage both at the spring/cable and at the dashpot (which I've cleaned and made sure wasn't frozen), the idle drops to 8-900.

 

8-900 is still high. Makes me think it isnt actually the TB.
Does it make any difference if you pull the throttle body linkage towards the front of the car when you close it?
what kind of data is the TPS giving on your scanner?

 

If I pull the entire throttle linkage toward the front of the engine bay, the idle drops.

I don't have a scanner.

 

If you want I'd be glad to ship you my old TB. It always had normal idle once warm on initial start.

 

Well I'd sure try it out if you're willing!

 

It would just be a test to see if you get normal idle on starting to rule in/out your throttle body being the issue. Mine is really no good and gets stuck once you start driving.
You would just have to swap over your tps.
I could send it Monday if you would be willing to cover shipping once you receive it.

 

Hey, can you describe how you swapped the throttle linkages? At first glance, they're very different, and the cast housing is even different. I'm in the middle of taking things apart to see how/if they can line up, but I can't figure out how to get the linkage off the new throttle body. Easy enough to get everything off the old one, but I don't understand how to get the new one apart.

I also notice now that your old throttle body is different than mine...one of your springs connects to the dash pot? You can see both mine attach to sort of a pin that sticks out. And you seem to have an unused, third cable slot?? My truck is a 98 V6 manual too. I see that 22210-62230 is for an auto, where -62240 (discontinued) is for a manual, so I'd assume that's the problem with it looking so different (aside from no cruise), but you say it fits your truck, so I'm hoping it can still work for mine. But I can't try it out until I can get the throttle stuff off it. After taking the nut off the very end, there's still something holding it all together, seemingly up near the throttle body housing.

Yours and Mine

 

Well I don't know what to think about my throttle body. The Toyota website shows 6 different ones that fit my truck (if I just enter my year, engine, transmission, not VIN). Every Ebay photo I see of a throttle body looks like yours. None have two spring hooks attached to a pin, like mine. They all have one hook attached to the mount under the dash pot like yours. Somehow I got a special one, and the one brand new throttle body still available from Toyota is cast differently. Still a chance I can make it work for my truck...but I still can't figure out how to get the throttle linkages off the thing.