Originally Posted by jlicrx
Fast Idle Control Valve is correct - only on 89-91 Si - not on 88 - also, not on DOHC ZC - the Fast Idle Control Valve is used to advance the idle when ambient air temperature is below -10C (14F)
Interesting. So the reason it isn't on some engines is because it's not a necessary component? Or it just doesn't get that f*ing cold in Japan...