car revs when started

[raygv]

I am going to be buying a 1993 camry from a tow yard for real cheap. its got 203K miles but looks pretty good. the only thing that I noticed is when the car is started the engine will rev up really high. 4500+rpm currently the weather is 104+ degrees. I noticed that there is a screw keeping the throttle open partially. I was able to turn the screw so the throttle would be able to close and the idle would return to a more normal range. The vibrations of the engine will rotate the screw back so after a while it sticks out enough to keep the engine going. my question is what is that screw doing there in the first place? I know nothing about toyotas...I'm really a honda boy forced into the evil cruel world of automatic sedans.

[chronoti]

welcome to the world of toyota.

thats normaly an evil honda trick where people who cant drive manuals use to increase/lower their rpms so it's easier for them to drive a manual.

the old owner might have put that there because the IAC valve might be sticking giving it a rought idle. just search around here with a screw driver and some cleaner you can get it running like new again.

[raygv]

So can I remove that screw? its not even a whole screw just the threads without the head.

I'll look around and try to find this Valve that you speak of. My Honda was killed right as I was getting to know all the workings. I'm not poking at toyotas I hear they are great cars I've never owned one. I'm not exactly thrilled to have an automatic car let alone a sedan. but life could be worse I could get stuck with a ford.

[Hajoca]

Well, I would adjust it to a proper idle speed, then back it out 3 turns or so, and add a drop of thread locker (loctite) and turn the screw back in the 3 turns.