Help! Exaggerated FC. 4af

[eto_ako]

Auto ko po ay ae92 na may 4af na makina.
Fuel consumption in city driving environment: 5km/L.
Newly overhaul po sya pati head. Kasama nga din ang carb pero ang takaw sa gas.
Do i need to buy a new carburetor o mas ok na magpaoverhaul ng carb?

About sa carb:
Walang tagas ang AAP nya, nasa tamang level ung fuel dun sa may glass sight. Ang idling, sa cold engine naglalaro sa 500rpm, pag naginit na nasa tamang 800rpm idle sya. Wala namang abnormal event kung ibibirit. Ok din pag naka aircon. Yung mga vacuum lines di ko sure kung tama pero mukhang ayos pa naman, walang mga leaks. Sakit lang talaga sa bulsa ng konsumo para lang naka v8 lol. Ang hindi ko lang alam testingin kung bukas ba yung big butterfly nya kahit naka idle kaya lumalamon ng gas o iba ang sukat ng jettings. Ayoko namang buksan para i check ang jettings kase baka hindi ko maibalik lol. Naka 2x balik narin ako dun sa gumawa ng carb pero walang pagbabago kaya bottom line ayoko na ipagalaw sa kanila.

Location ko po ay laguna pa, kaya kung may maisu-suggest kayong magaling talaga sa carb na makakatulong po sa pag diagnose mas makakatulong talaga. TIA

[lowslowbenz]

How did you know na wala vacuum leaks? Your choke flap maybe stuck to the closed position. Are you using the stock air filter, or aftermarket na? Did you own the car since brand new, or second owner ka? Any idea on the primary and secondary jet size?

Carbs are very simple fuel metering devices, but an inexperienced pair of hands will fcuk it up almost easily.

[jick.cejoco]

Auto ko po ay ae92 na may 4af na makina.
Fuel consumption in city driving environment: 5km/L.
Newly overhaul po sya pati head. Kasama nga din ang carb pero ang takaw sa gas.
Do i need to buy a new carburetor o mas ok na magpaoverhaul ng carb?

About sa carb:
Walang tagas ang AAP nya, nasa tamang level ung fuel dun sa may glass sight. Ang idling, sa cold engine naglalaro sa 500rpm, pag naginit na nasa tamang 800rpm idle sya. Wala namang abnormal event kung ibibirit. Ok din pag naka aircon. Yung mga vacuum lines di ko sure kung tama pero mukhang ayos pa naman, walang mga leaks. Sakit lang talaga sa bulsa ng konsumo para lang naka v8 lol. Ang hindi ko lang alam testingin kung bukas ba yung big butterfly nya kahit naka idle kaya lumalamon ng gas o iba ang sukat ng jettings. Ayoko namang buksan para i check ang jettings kase baka hindi ko maibalik lol. Naka 2x balik narin ako dun sa gumawa ng carb pero walang pagbabago kaya bottom line ayoko na ipagalaw sa kanila.

Location ko po ay laguna pa, kaya kung may maisu-suggest kayong magaling talaga sa carb na makakatulong po sa pag diagnose mas makakatulong talaga. TIA

Newly overhaul po sya pati head.
if the engine is newly overhauled, the cylinder bores and the piston rings are not fully mated yet and there is still too much friction from the cross hatched hone. the bearings are probably still breaking in too. try to give your re-virginized engine some time.

[GTi]

Since overhaul, you will observe break in procedures again. The FC should improve as the kilometers pile up. Though you should probably also check if something is dirty or clogged.

[eto_ako]

ok boss. so far 1 month palang ang sya since overhauled running approx 500kms. any tips sa breakin procedures?

eto ang pictures ng carb sir, kung may makikita man kayong unusual sabihin nyo lang po, thanks :D

IMAG0807Medium_zps8ada85bc.jpg Photo by jasonaladin | Photobucket

[kompressor]

Read your plugs. Malamang covered in soot yan given your FC.

Lean out the mixture muna during the first 500+ kms of the break-in process. (sakal jets and retard ignition timing ng konti). After at least 500-1000kms, bring back the jettings to factory spec and adjust ignition timing to factory specs as well. Before adjusting the jettings (leaning out and back to factory spec), make sure you have no manifold and vacuum line leaks. Mura lang naman per foot ang mga vacuum lines. Buy the ones na meron nang ply.

[Ammiel Barlis]

Auto ko po ay ae92 na may 4af na makina.
Fuel consumption in city driving environment: 5km/L.
Newly overhaul po sya pati head. Kasama nga din ang carb pero ang takaw sa gas.
Do i need to buy a new carburetor o mas ok na magpaoverhaul ng carb?

About sa carb:
Walang tagas ang AAP nya, nasa tamang level ung fuel dun sa may glass sight. Ang idling, sa cold engine naglalaro sa 500rpm, pag naginit na nasa tamang 800rpm idle sya. Wala namang abnormal event kung ibibirit. Ok din pag naka aircon. Yung mga vacuum lines di ko sure kung tama pero mukhang ayos pa naman, walang mga leaks. Sakit lang talaga sa bulsa ng konsumo para lang naka v8 lol. Ang hindi ko lang alam testingin kung bukas ba yung big butterfly nya kahit naka idle kaya lumalamon ng gas o iba ang sukat ng jettings. Ayoko namang buksan para i check ang jettings kase baka hindi ko maibalik lol. Naka 2x balik narin ako dun sa gumawa ng carb pero walang pagbabago kaya bottom line ayoko na ipagalaw sa kanila.

Location ko po ay laguna pa, kaya kung may maisu-suggest kayong magaling talaga sa carb na makakatulong po sa pag diagnose mas makakatulong talaga. TIA

Sigurado ka ba sir na 4af makina mo. 4Afe engine is fuel injected and does not use a carburator as far as i know. Baka 2E yan

[kompressor]

Meron ding 4A-F aside from 4A-FE. Carbureted ang 4A-F twin cam 16 valve which is installed sa mga 89-92 na 1.6GL local variants. 2E (1.3 12 valve sohc) yung installed sa mga XL tsaka mga XE. Nung panahon na ng AE101 (big body sa street lingo) kinabit ang 4A-FE which is the twin cam 16 valve fuel injected version na installed sa 1.6 GLi na local variants.

Stated dito yung difference ng 4A-F vs 4A-FE http://en.wikipedia.org/wiki/Toyota_A_engine

[jick.cejoco]

Sigurado ka ba sir na 4af makina mo. 4Afe engine is fuel injected and does not use a carburator as far as i know. Baka 2E yan

the valve cover in the picture is that of 4af, it has only one cam pulley. if it had two separate pulleys for the intake and one for the exhaust valve it becomes 4ag/4age/4agte

[Ammiel Barlis]

the valve cover in the picture is that of 4af, it has only one cam pulley. if it had two separate pulleys for the intake and one for the exhaust valve it becomes 4ag/4age/4agte

Thanks for the info. Never knew this. You really learn something everyday. Thanks again