my idle seems to have slowly increased rpmsover the years.
the idle used to be around 600-700rpm when properly warmed up.

now it never sees less then 1100rpm after warmed up.

i looked in the throttle body and engine bay and no adjustment screw.

anyone know how to adjust it down?


camry
1992
auto
4 cylinder

 

I don't think there is an adjustment screw, I believe it's factory set and controlled by the idle speed control (ISC) valve or idle air control (IAC) valve which is controlled by the ECM. You can try cleaning the IAC for a start (Do a search here). Maybe another possibility is your throttle or throttle cable is binding and not allowing the throttle to close all the way. If this were a vacuum leak I think you'd be getting an uneven idle. Just some suggestions.