Whats up with my idle?

[a7x3815]

Gota LS/Vtec and whenever it gets up to regular temp. the idle goes outa wack shooting from 800 to 1500 sometimes up 2200 and back down constantly it gets really annoying after for hearing it for the first 2 seconds what can i do to make that go away

 

[Justin66]

https://hondaswap.com/general-tech-articles/fixing-erratic-idle-29093/

 

[INJEN78]

sounds like your FITV,clean it out,if that doesnt work,it needs replaced

 

[a7x3815]

Im not to good with names of things im still kinda new to this wheres that located at ?

 

[moosebrew]

did you ever figure out what was causing it? I am having the exact same problem with my dohc zc.

 

[SneakyTouchYourPlace]

Before replacing your IAC or FITV (idle air control valve and Fast idle thermo valve), make sure your not overheating at all. Overheating can melt the wax plungers inside and ruin it, even if it overheated just once. Also make sure you have enough coolant in the motor, air pockets can prevent those valves from closing, so can a plugged coolant line. Also check your idle screw if you have one. Make sure its not all the way open.

Basicaly those 2 valves have coolant flowing through and when it warms up, they close valves that stop air from coming in to lower the idle. Your MAP sensor, TPS and rpm signal are gona start argueing in your pcm causing your iac to be controlled improperly, making idle go up and down every second.