High idle when cold

[boostinboy]

for some reason when I start my car when the engine is cold, it idles at 2500rpm a couple seconds after I start it but once the engine is warm it idles at like 1-1500rpm. Is this normal? Its been doing this ever since I got my jdm motor put in

 

[talontsi01]

Yea. That sounds normal. My idles at about 2000 when its cold. 2500 only when its below freezing it seems like. When your car completely warms up, you should be idling at about 800.

 

[awd4g63]

The idle habit sounds normal. When your engine is completely warmed up, turn off ALL accessories and adjust your BISS screw to around 750-800 rpms.

 

[Colossus]

Electric Choke? Don't our cars have chokes?

 

[boostinboy]

but isnt that bad for the motor considering there's no oil in the top end when the engine is cold?

 

[Mike1992]

On start up lately mines goes straight to 1500 when cold, the idles down to about 700 after a few mins.

 

[awd4g63]

but isnt that bad for the motor considering there's no oil in the top end when the engine is cold?

Not really, there's usually always a film of oil there no matter what, I just wouldn't recommend driving hard until the engine is at full operating temperature.

Electric Choke? Don't our cars have chokes?

Not really a choke, it's an automatic fuel enrichment. Do a search for the "Fast Idle Air Valve" and it should explain a little more.