High idle when cold

[aa010175]

My 2000 4 runner idles at 1800 RPM when cold. Idles at 800-900 when warm with A/C off. I have no codes on engine and passed California smog. Any ideas what’s wrong? Thanks Dave

 

[alumarine]

Vehicles are supposed to do that.

 

[phattyduck]

Vehicles are supposed to do that.

Unless the San Diego location is a lie, that is too high for "cold" in San Diego. It can get up to 1800rpm cold - but that's like 0*F cold. Sand Diego cold is more like 1100rpm on a cold start. Hot idle should be ~700rpm.

I'd say actual engine RPM should be checked (OBD-II scanner, etc.) to make sure the gauge is not acting up. There may also be a vacuum leak somewhere in the system.

-Charlie

 

[Killross2012]

My 2000 4 runner idles at 1800 RPM when cold. Idles at 800-900 when warm with A/C off. I have no codes on engine and passed California smog. Any ideas what’s wrong? Thanks Dave

It’s an auto choke. Cold or warm they will do it unless your just driving then it may not