rpm bounce cause?

[ralph13]

rpm bounce cause? anu anu po kaya mga dapat i check dito.

lancer gti 1992 EFI

12v engine.

problem encountered: from cold start mababa masyado rpm nya pero habang tumatagal tumataas. but after nya ma reach ung stable idle bigla nlng siya ng up and down na idle. mas malakas ang rpm bounce pag ng headlight. kelangan pa adjust idle to 1k rpm para maging medyo stable. but 1k is too high for idle..

note: nka bypass na servo


salamat po

[lowslowbenz]

12V engine? Ano yan?

Bypass ang servo? Why?

If its fluctuating idle, then there is something wrong in your idling circuit. Have your throttle body checked.

[rodetor]

The 12V stands for 12 Valves, in a Mitsubishi engine for that model. 3 valves per piston cylinder, in a 4 in line cylinder engine.

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[lowslowbenz]

The 12V stands for 12 Valves, in a Mitsubishi engine for that model. 3 valves per piston cylinder, in a 4 in line cylinder engine.

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Ah ok. thank you for enlightening me sir.

[rodetor]

rpm bounce cause? anu anu po kaya mga dapat i check dito.

lancer gti 1992 EFI

12v engine.

problem encountered: from cold start mababa masyado rpm nya pero habang tumatagal tumataas. but after nya ma reach ung stable idle bigla nlng siya ng up and down na idle. mas malakas ang rpm bounce pag ng headlight. kelangan pa adjust idle to 1k rpm para maging medyo stable. but 1k is too high for idle..

note: nka bypass na servo


salamat po

Alisin mo yun pagkaka bypass, o ayusin mo yun servo. Mataas sa una, nasa range of 1300 ~ 1500 RPM mula sa cold start during idle. Habang tumatagal sa idle na warm up, saka lang bumababa ang RPM, malapit sa normal, stable idle na 800rpm. Mahihirapan yan ECU( computer box ) sa normal control and monitor, sa engine operation. Baka ma-damage pa yan ECU, at lagi kang may check engine light.
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[rodetor]

Ah ok. thank you for enlightening me sir.

[emoji106] walang anuman.

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[ralph13]

Alisin mo yun pagkaka bypass, o ayusin mo yun servo. Mataas sa una, nasa range of 1300 ~ 1500 RPM mula sa cold start during idle. Habang tumatagal sa idle na warm up, saka lang bumababa ang RPM, malapit sa normal, stable idle na 800rpm. Mahihirapan yan ECU( computer box ) sa normal control and monitor, sa engine operation. Baka ma-damage pa yan ECU, at lagi kang may check engine light.
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actually sir sira na kasi servo ko and ung servo ko is very rare. kaya wala na dito masyado sa pinas nun. hndi ko ma gets kasi kng sa ignition ba or sa electrical na kasi tuwing gagamit ako ng headlight dun mas lumalakas ung rpm bounce nya

[barako ba ma]

Your car has aged graciously. The pcm runs the engine in open loop when the engine has not reached normal operating temperature, meaning, it runs at preset parameters and will only make smart adjustments when it has warmed up. Have your TPS scoped for errors in signal. When the TPS and the MAP or MAF signals don't match longer than two seconds, the engine hunts or the idle speed is unstable because the PCM is confused whether to follow the TPS or follow the MAP/MAF. If the TPS is adjustable, it might be out of range or has glitches on the signal band. This is true with the '90's TPS

[rodetor]

Your car has aged graciously. The pcm runs the engine in open loop when the engine has not reached normal operating temperature, meaning, it runs at preset parameters and will only make smart adjustments when it has warmed up. Have your TPS scoped for errors in signal. When the TPS and the MAP or MAF signals don't match longer than two seconds, the engine hunts or the idle speed is unstable because the PCM is confused whether to follow the TPS or follow the MAP/MAF. If the TPS is adjustable, it might be out of range or has glitches on the signal band. This is true with the '90's TPS

True, logically that is how the PCM works. He needs to calibrate its TPS, kung wala sa calibrated range in WCT (wide close throttle ). Palagi mag aadjust ang PCM ng idling speed.

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[barako ba ma]

He needs to calibrate its TPS, kung wala sa calibrated range in WCT (wide close throttle




?????


Are you referring to ranging the TPS from closed throttle (0.5 v) to wide open (4.5 v)?

[enzo6k]

iscv baka puro gunk na, sabay na din linis throttle body

[rodetor]

actually sir sira na kasi servo ko and ung servo ko is very rare. kaya wala na dito masyado sa pinas nun. hndi ko ma gets kasi kng sa ignition ba or sa electrical na kasi tuwing gagamit ako ng headlight dun mas lumalakas ung rpm bounce nya

Any electrical load na ma-add, your PCM adjust its speed or idle it up, para ma compensate ng alternator yung added electrical current load. Di maconfigure ng PCM mo ang dapat na ibigay nya idling speed, kaya di stable, dahil, di mag match sa mga sensing parameters input and output. Gaya sa temperature gauge nya, normal operating temp na engine mo pero ang sense nya sa iscv(servo) ay hindi pa. Taas baba ang output control nya sa idling speed. At nagalaw mo iadjust idling to 1k rpm para mai-stable mo. Madagdagan pa ng electrical current load, pagsindi ng headlight, 55w ang current consumption nya, hindi lang 10w, mag aadjust pcm mo to idle up, ng hindi mahirapan alternator mo sa pagbigay ng hinihingi ng current ng headlight, ganun pati rin sa engine para sa igniter at spark plug. Kaya mas pansin, malakas ang bounce sa rpm needle mo.

Nagawa mo na ba mag hanap mabibilhan sa servo(iscv) mo?

Diko sure ang MIT-Parts sa banawe, kung ang store na eto andun pa. Try mo na lang i-google para makuha landline numbers nila. Wala na ako resibo nila. Dun ko halos ibinili parts ko sa kanila nuon sa Lancer Singkit (CYCLONE) namin. Gaya ng, electronic igniter ( sa distributor), cap at rotor arm. Try mo na rin sa mga ibang auto supply sa banawe kung wala na yung store na nasabi ko. Ewan ko lang din yung bestcolt auto supply kung andun pa.

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[ralph13]

Your car has aged graciously. The pcm runs the engine in open loop when the engine has not reached normal operating temperature, meaning, it runs at preset parameters and will only make smart adjustments when it has warmed up. Have your TPS scoped for errors in signal. When the TPS and the MAP or MAF signals don't match longer than two seconds, the engine hunts or the idle speed is unstable because the PCM is confused whether to follow the TPS or follow the MAP/MAF. If the TPS is adjustable, it might be out of range or has glitches on the signal band. This is true with the '90's TPS

very accurate answer!!! salamat po. so TPS lang po ba ang dpat ko i adjust dito? what is the settings that should i use?

[ralph13]

Any electrical load na ma-add, your PCM adjust its speed or idle it up, para ma compensate ng alternator yung added electrical current load. Di maconfigure ng PCM mo ang dapat na ibigay nya idling speed, kaya di stable, dahil, di mag match sa mga sensing parameters input and output. Gaya sa temperature gauge nya, normal operating temp na engine mo pero ang sense nya sa iscv(servo) ay hindi pa. Taas baba ang output control nya sa idling speed. At nagalaw mo iadjust idling to 1k rpm para mai-stable mo. Madagdagan pa ng electrical current load, pagsindi ng headlight, 55w ang current consumption nya, hindi lang 10w, mag aadjust pcm mo to idle up, ng hindi mahirapan alternator mo sa pagbigay ng hinihingi ng current ng headlight, ganun pati rin sa engine para sa igniter at spark plug. Kaya mas pansin, malakas ang bounce sa rpm needle mo.

Nagawa mo na ba mag hanap mabibilhan sa servo(iscv) mo?

Diko sure ang MIT-Parts sa banawe, kung ang store na eto andun pa. Try mo na lang i-google para makuha landline numbers nila. Wala na ako resibo nila. Dun ko halos ibinili parts ko sa kanila nuon sa Lancer Singkit (CYCLONE) namin. Gaya ng, electronic igniter ( sa distributor), cap at rotor arm. Try mo na rin sa mga ibang auto supply sa banawe kung wala na yung store na nasabi ko. Ewan ko lang din yung bestcolt auto supply kung andun pa.

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sir wala dun ung servo ko. wala sila bnebentang ganun klase. is there anyway kya paara maayos ko to without this servo? kahit nka bypass na ako for aircon.

[rodetor]

sir wala dun ung servo ko. wala sila bnebentang ganun klase. is there anyway kya paara maayos ko to without this servo? kahit nka bypass na ako for aircon.

HBK Motor Parts. Na try mo na rin ba mag inquire? They have an FB page, try inquiring tru messenger. Mas maganda, baklasin mo yun iscv(servo) part, piktyuran mo, mga tatlo o apat na angulo, i-chat inquire mo kasama mga pics. Lancer GTi 1992 EFI, ang ride mo, napaka impossibleng wala pang labas na replacement part sa aftermarket.

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[rodetor]

Eto screenshot ko sa page nila, buti na browse ko pa. Medyo mahina net sa area namin. Pang 1996, kaya impossible naman pang 1992 eh wala pa rin kahit replacement part.

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[Patrick rolla]

Hi guys I have a problem with my 95 corolla xl 2E engine
palyado siya sa idle taas baba needle ng rpm panget tunog ng muffler pero pag natakbo naman smooth
bagong palit sparkplug,fuel filter, hi ten wire still ganun pa din ano kaya cause nito?? sa carb na ba ito?

[mina_nuka]

Hi guys I have a problem with my 95 corolla xl 2E engine
palyado siya sa idle taas baba needle ng rpm panget tunog ng muffler pero pag natakbo naman smooth
bagong palit sparkplug,fuel filter, hi ten wire still ganun pa din ano kaya cause nito?? sa carb na ba ito?

Have you thought of the spark intensity being inadequate?
Available voltage. 100%
Required voltage. 60%
Reserve voltage. 40%


If the spark observed outside of the combustion chamber is other than bluish white the spark is too weak.

Other possible causes:
Worn out camshaft
Carbon build up behind the valves
Carbon build up inside the intake and exhaust ports.
If memory serves me right, your engine has port fuel injection. These might be clogged or sticky.