low idling during cold start

[Xer0923]

i had this problem for quite sometime now..every morning or kapag malamig yung engine mababa yung idle ko pag inistart usually around 600-700rpm although hindi naman namamatayan but i need to step on the gas pedal para tumaas ng onti yung rpm ko but before naman pag cold start nasa 1.1k-1.2krpm ko then baba after a minute or two kapag umandar na. now baliktad kapag umandar nako ng lets say 500meters ayun tataas yung idle ko ng 1-1.1krpm then after ilang kms na tinakbo ko magiging normal na yung idle ko for 800-900rpm. ano kaya possibe na problema? any parts to check?

TIA!

[v6dreamer]

You did not say that the vehicle is carbureted or fuel injected. If it has a carburetor, this might be the problem. If you have an automatic choke, check to see that it does not stay closed for too long. common problem on a dirty carb.
When the motor is cold, it will start right up, but will lump at idle and feel rough because the choke provides a too rich a mixture and overloads the engine to the point where it wants to run rough, almost to the point of stalling. Once the auto choke begins to come open it smooths out.
Check the choke. I'm not saying this is the problem, but it sounds so much like the problem of others.

[theflaw]

ganyan itong mazda 323 ko mababa ang idle kapag umaga or malamig ang makina pero habang umiinit tumataas na ang idle hanggang sa marating na ang normal idle.. siguro nga yong choke nya kasi di na gumagana pero ok lang yon sakin..

[hilldweller]

i had this problem for quite sometime now..every morning or kapag malamig yung engine mababa yung idle ko pag inistart usually around 600-700rpm although hindi naman namamatayan but i need to step on the gas pedal para tumaas ng onti yung rpm ko but before naman pag cold start nasa 1.1k-1.2krpm ko then baba after a minute or two kapag umandar na. now baliktad kapag umandar nako ng lets say 500meters ayun tataas yung idle ko ng 1-1.1krpm then after ilang kms na tinakbo ko magiging normal na yung idle ko for 800-900rpm. ano kaya possibe na problema? any parts to check?

TIA!

Ganyan rin ang naexperience ko. Ang ginawa ko hinigpitan ko ang cold idle up screw of carb para tumaas ang cold idle. Ok na sya ngayon, isang click lang pagcold start.

[reym]

tama si v6, kung carb yan, ung choke mo problema, kc un ang nagbibigay ng mas maraming gas when temp is low.

[Xer0923]

sorry for that btw, my car is corona exsior. dont know the main culprit though. thanks for your input guys!

[badtoy]

corona exsior with a 3SFE engine. EFI yan and cold start is controlled by the idle speed control valve. baka madumi na kaya stuck na on low idle. just have it cleaned using carb cleaner,

[simarun]

Ang ginawa ko hinigpitan ko ang cold idle up screw of carb para tumaas ang cold idle. Ok na sya ngayon, isang click lang pagcold start.

Alin po ba dun yung cold idle screw? yung nsa tabi ng choke? 4 kc yata yung pwedeng iadjust sa carb eh, yung idle, yung sa may aircon, tpos air/fuel, then parang meron pa sa malapit sa auto -choke. tia

[hondab16]

ganyan dn un honda hatch ko dati.b16 engine kpg umaga ayaw mg hi rpm. tpos pinalitan ko un choke nya. nka pwesto un sa baba ng trotle body.malamang cra na un syo.hndi na cya bumubukas kya mababa lgi idle kpg unang start sa umaga.

[oj88]

This might be far fetched but I might as well mention it. This symptom showed up on our Lancer GLXi more than a decade ago. Prior to this, a mechanic removed the thermostat (due to it being stucked up closed). When the engine is cold, you really have to step on the gas pedal to keep the engine from stalling. You have to do this for several minutes because without the thermostat, it takes longer for the engine to warm up and the RPM to stabilize. Once the engine has warmed up, everything remains normal until the next cold start. Putting in a new thermostat solved the problem.

[hilldweller]

Alin po ba dun yung cold idle screw? yung nsa tabi ng choke? 4 kc yata yung pwedeng iadjust sa carb eh, yung idle, yung sa may aircon, tpos air/fuel, then parang meron pa sa malapit sa auto -choke. tia

Ang sa Lancer na carbureted, ang cold idle up screw ay malapit sa dulo ng throttle cable, malapit sa auto-choke. Ang ulo ng screw ay nakaharap sa firewall. Ang pagpataas ng cold idle ay ang paghigpit ng kaunti ng screw.

[speed unlimited]

If your engine is EFI .How long did you clean your MAF Sensor, IACV idle air control valve , Throttle body for long time carbon build up. This is also part of basic maintanance to make your idle in proper order. Just my suggestion.

[Xer0923]

i already cleaned up my TB using carb cleaner pero ganon pa din, re: map sensor medyo tunaw na yung lower part.

[badtoy]

i already cleaned up my TB using carb cleaner pero ganon pa din, re: map sensor medyo tunaw na yung lower part.

pati yun ISCV bugahan mo din ng carb cleaner. yun sensor safe dapat.

[Xer0923]

pati yun ISCV bugahan mo din ng carb cleaner. yun sensor safe dapat.

yun din sabi sakin bro pati yung iscv, kaso kelangan pa i-dismantle di kaya diy.

[Xer0923]

in addition pala, kapag umaandar nako and lets say nag nuetral nako yung rpm ko ang taas mga 1.3k rpm parang nagstuck up so need ko pa mag rev ng once or twice para bumalik sa normal idling w/c is 800rpm. it all started nung nagspray ako ng carb cleaner sa TB ko.

[badtoy]

malamang nag iistuckup yung idle servo mo eto yun ISCV. baka naninikit na sa dumi. Pwed naman i DIY yan kahit hindi mo idosmantle. Sa hose mo bugahan ok na yan mga 5 shorts sprays lang yun ng carb cleaner

[T2J]

zero kaya mo yan dismantle just be carefull to pull out the gasket sa Trottle body at sa cold start valve un yung my dalawang rubber hose galing sa cylinder head panigurado ko kong hindi ka nagamit ng coolant maraming dumi yan at ganun din ang Idle air control valve(IACV) sigurado maraming carbon build up yan I recommend na ang gamitin mong carb cleaner ay yung 3M na kulay white sa handyman ka bumili kong hindi mo lilinisin yan dyan na magsisimula na humina ang batak at lalakas sa gas at ang worst pa nyan baka masira ang ECU mo kasi hindi makakapagbigay ng magandang signal sa ECU ang IACV kaya ang maapektuhan ay ang parts sa loob ng ECU. SAna makatulong sa yo.

[Rjmar]

This might be far fetched but I might as well mention it. This symptom showed up on our Lancer GLXi more than a decade ago. Prior to this, a mechanic removed the thermostat (due to it being stucked up closed). When the engine is cold, you really have to step on the gas pedal to keep the engine from stalling. You have to do this for several minutes because without the thermostat, it takes longer for the engine to warm up and the RPM to stabilize. Once the engine has warmed up, everything remains normal until the next cold start. Putting in a new thermostat solved the problem.

Maybe thermostat stuck open engine get warm not that fast

[dr. d]

Maybe thermostat stuck open engine get warm not that fast

yes, this is a possibility.