I have a 1993 Toyota Pickup. 22RE.

the idle had been getting rougher with the cold. It would high idle at 2100 rpm on a cold start and began surging when warm.

I adjusted the screw on the top of the throttle body and my idle was PERFECT. Cold idles never exceeded 1800 rpms for more than a few seconds.

However, coming to a stop sign or two lately the idles been chugging away at about 450 rpm. I'll stop and get out, pop the hood and adjust the screw with my handy-dandy glove box gerber multitool.

it'll be fine for a few minutes, hours or days... but it soon wanders again requiring adjustments.

What do you recommend I use? a washer? loc tite?

 

There is an O-Ring on that adjustment screw and yours is probably dry-rotted. I had the _exact_ same issues you describe after my recent rebuild. Surging idle, and constant re-adjustment of the idle screw. It'd back nearly all the way out sometimes which is what led me to understand it has an O-Ring.

I replaced the O-Ring and it is solid now. If you don't have - or can't find - an O-Ring, get it to where you like it (warm), and then smear some heavy grease around it and that will at least slow the movement. Not elegant, but will work.

 

Oh - don't Loctite it, you will regret that.

 

The o-ring comes in a gasket set...or you can get it at the dealer.

 

How do you know its moving? Did you index it?

 

I think I've got some metric o-rings that fit perfect. PM me if you're interested and I can mail you one for a small $$.

 

O ring for throttle air bypass screw is same as the one for a fuel injector

 

i had the same problem with my idle screw. i could physically watch it wander when the engine was running. i didn't know about the o-ring at the time, so i just used some teflon tape from my toolbox, on the threads -- been working great for 4yrs like that.

 

Yeah, the rubber gasket on the mixture screw eventually turns to stone.

Chip it all out and go to your local NAPA/Autozone whatever and ask them to find you an injector o-ring that fits right. The local NAPA did it for free for me.