Idling always goes down to 500rpm

[ravelcop]

i just bought a Sentra B12 1.5 SGX and im confused kung bakit palagi nalang bumababa to 500-400rpm ang idling ng kotse. No matter how the mechanic adjust the idling to 800-1000rpm, bumabalik pa din sya to 500rpm after i let the engine cool down. This is my 3rd time already to have my idling adjusted and still it goes down even upon AC on, exactly the same 500rpm. After adjustment, akala namin ok na, pero pag-uwi ko ng bahay then start ang kotse after mga 2hrs, balik ulit to 500rpm. tumataas lang sya pag nag-engage na ang radiator fan, pero konti lang itinaas. Ano po kaya ang problem?

[jeegoogs]

1.air filter cleaning
2.check vacuum hoses
3.try air to fuel ratio adjust
4. Timing sa distributor(retard ba or advance)
5. timing belt mo baka maluwag tensioner
6. if same prob,carb overhaul,ceaning
suggestions lang to kaibigan,maraming possibilities pa yan.daan mo nalang sa casa para cgurado.

[jeegoogs]

i just bought a Sentra B12 1.5 SGX and im confused kung bakit palagi nalang bumababa to 500-400rpm ang idling ng kotse. No matter how the mechanic adjust the idling to 800-1000rpm, bumabalik pa din sya to 500rpm after i let the engine cool down. This is my 3rd time already to have my idling adjusted and still it goes down even upon AC on, exactly the same 500rpm. After adjustment, akala namin ok na, pero pag-uwi ko ng bahay then start ang kotse after mga 2hrs, balik ulit to 500rpm. tumataas lang sya pag nag-engage na ang radiator fan, pero konti lang itinaas. Ano po kaya ang problem?

hmmmm,teka

[ravelcop]

thanks for the reply jeegoogs,

unfortunately, lumala na po yung problem. Namamatay na po ang engine.

bale, same symptoms, it starts with a normal idling, then after a few kilometers of driving, idling starts to go down to 400-500rpm. And pag pinagpatuloy mo pa ng ilang kilometers, namamatay na ang engine. when you start it, aandar ang engine ng mga 2 seconds then idling drops down until engine dies. you can really see how the idle tries to cope up before it dies, parang nahihirapang makaakyat ang fuel. sobrang erratic ang idling nya coz kahit anung adjust ang gawin, minsan sobra-sobra ang rpm, pag inadjust ulit, sobrang baba naman. tapos, hayaan mo lang ng 1 hour, it will start normally again.

when i got stalled, i had it checked by a mechanic sa karatig na station. he said madumi na daw ang carburetor. but as far as i know, kaka-overhaul lang ng carburetor ko. so he then suspected baka merong object sa loob ng gas tank na bumabara kaya bumababa ang idling, namamatay ang engine, and it would start normally again after an hour.

kaya nung uuwi na ko, i didn't take the risk anymore, iniwan ko nalang ang kotse sa shop and nag-taxi nalang ako. kahit umaandar na auto ko, i know maaaberya ulit yun.

[jeegoogs]

thanks for the reply jeegoogs,

unfortunately, lumala na po yung problem. Namamatay na po ang engine.

bale, same symptoms, it starts with a normal idling, then after a few kilometers of driving, idling starts to go down to 400-500rpm. And pag pinagpatuloy mo pa ng ilang kilometers, namamatay na ang engine. when you start it, aandar ang engine ng mga 2 seconds then idling drops down until engine dies. you can really see how the idle tries to cope up before it dies, parang nahihirapang makaakyat ang fuel. sobrang erratic ang idling nya coz kahit anung adjust ang gawin, minsan sobra-sobra ang rpm, pag inadjust ulit, sobrang baba naman. tapos, hayaan mo lang ng 1 hour, it will start normally again.

when i got stalled, i had it checked by a mechanic sa karatig na station. he said madumi na daw ang carburetor. but as far as i know, kaka-overhaul lang ng carburetor ko. so he then suspected baka merong object sa loob ng gas tank na bumabara kaya bumababa ang idling, namamatay ang engine, and it would start normally again after an hour.

kaya nung uuwi na ko, i didn't take the risk anymore, iniwan ko nalang ang kotse sa shop and nag-taxi nalang ako. kahit umaandar na auto ko, i know maaaberya ulit yun.

pa check mo narin and fuel pump nya bka worn out na.hope this helps.....