[ZenkaiRacerSi]

My idle is really screwed... when its cold it bounces around 1500 rpms sometimes 1500-2000... and them when its warm its really low sometimes... i just put a new motor in my car.... i remember it did ths exact stuff with my old motor when i first got it.... anyone know what the problem is?

 

[SuperSpeed]

i'd probably check the throttle cable, might be loose or something. if it isn't that, maybe check the idle screw and resetting the ecu

 

[PAC-MAN]

My idle is really screwed... when its cold it bounces around 1500 rpms sometimes 1500-2000... and them when its warm its really low sometimes... i just put a new motor in my car.... i remember it did ths exact stuff with my old motor when i first got it.... anyone know what the problem is?

check the TPS(throttle position sensor) or the FIV(fast idle vavle), both are known to cause it, my old gs-r used to do that, it was the FIV

 

[ZenkaiRacerSi]

the ecu has been reset, the throttle cable is fine, and i messed with that screw.... would i be able to swap the throttle position sensor or the fast idle valve off a 92 cx intake manifold? i am using a 92 si intake manifold right now

 

[junglistgsr]

yeah, the fast idle valve caused my friends GSR to do that...but i dont know if civics have them....i know ITR's dont have them....but if you do have them make sure to check that because it made his idle real high when cold and sometimes rev itself when cold

 

[phmracing]

sounds like the idler control valve

 

[dgrobe2112]

has anyone thought of a map sensor??

I once heard that a map sensor or throttle position sensor can cause eratic idling