Adding FICD onto your system that's not suppose to run on FICD will give you high fuel consumption. It's just like those micro compressor aka power booster that only allows more air into the intake. The only difference is that it uses a solenoid.

Why not you try cleaning the throttle body first? I solve 7 out of 10 Wiras that came to me with idling problem. As long as your TB is kept clean, it shouldn't give you any problems

I has clean the throttle body before,but still cant fix the problem..my problem is the rpm keep rev up and down continuesly when idle,not low rpm problem...after take out the gear,found one of the teeth has broken already.

I thk the method which mentioned by the foreman is not FICD,coz he quote me rm200 for this vacum thingy.and he mentioned is mod the throttle body,and not add some extra thing like FICD..

need to know whats ur mechanic ingenious method of using vacuum to solve the problem... there is alot of method that utilizes vacuum effect...

my throttle body running without ISC... totally blocked off using aluminum plate... using ficd now... runs well no problem whatsoever...

1 control aircond, another control cold start

most mechanic will remain the "dead" ISC component there but fix an ficd to solve the problem... well, this method does not 100% solve the problem because ur ISC might still go crazy because the ISC socket is still connected to it... it will still constantly self-adjusting itself to the changes of intake vacuum (because u use ficd, intake vacuum pressure fluctuates whenever aircond kicks in)... in such condition, ur ecu will continuously try to adjust the vacuum pressure via the dead or semi-dead ISC motor... in long run, ur ecu might also get damaged...

hence, it is safe to completely remove the ISC unit and disconnect the ISC socket and totally rely on the ficd unit...

not sure if engine check light will lit up or not after disconnecting ur ISC socket... i think it can be solved via PDT reset fault.... my car dont have engine check light coz convert from carburetor to fuel injection...
err... dun have diagram ler... vr simple connection... ficd only has 2 wire... signal and ground... signal wire u connect to 12vdc and den to an external switch mounted inside ur car... switch is den grounded... this creates a complete circuitry...

as for the hose connection, 1 is in and another is out... intake path i left it open (or u can install a breather there), while the output path is tapped to the second ficd (which controls the aircond) output path, which both will eventually connected to the intake manifold...

so when coldstart ur engine revs drop or gets lumpy, just switch the ficd on and adjust ur coldstart idling rev at the ficd... its that simple...

yeap... i'm using it on MAP system...
i guess when people say it increases fuel consumption, reduce power and so on, it happens on engines running MAF system... because the MAF detects how much air passing through it... if u bypass the air and directly enters the intake manifold, that amount of air will not be detected by the MAF sensor...

if add the hose at intake after MAF sensor before throttle body, it defeats the purpose during idling rite??... coz when idling, throttle body will be shut close... there is no engine vacuum to suck in air to bring up the idling rpm...
good la... congratulations...

before or after throttle body??...

huh??.. 1st one control idling a/c off??... 2nd one control idling a/c on??...

there is a plastic knob at ur throttle body which controls the idling a/c off mahh... why u need external help??...