this kinda late...
sir pwde mo explain further yung naka red highlight?it seems na ganito problem ng oto ko ngayon...madali maubos reserve coolant ko and at the same time unstable din idle ko when AC is on.


quick test: pag malamig yung makina, mataas ba yung idle? tapos as the temp rises bumababa siya to normal 700-800rpm level? if so, the IACV is still working (kind of).

the symptom na when you press the gas and then release, hindi bumababa agad yung idle, seems like dirty IACV not responding quickly enough anymore. also try to check your coolant level because air in the coolant system can affect the IACV's operation (jumping idle).

kayang linisin ng DIY yung IACV, pero don't expect massive improvements. i think when the car gets old idling problems become prevalent, this seems to be common to all brands and makes.

but if i were you, i'd try cleaning the IACV first. in my case it was fouled with so much carbon kaya hindi na siya nag-re-respond quickly.[/quote]