What could be the problem? (carb engine / high gas consumption)

[batusai_jr]

My car is a Toyota Corolla XE 95. I had it overhauled, tuned up, replaced timing belt, replaced the motor in the radiator, modified the carb with a brand new 4k carb, replaced all stuffs with regards to "kalampag", had done everything i know with regards to fuel consumption to save gas, yet it still consumes alot... city driving is 6.5-8km per liter, long drives 7.5-8.5km at the most...

i really am having problems with it... most cars of the same model consumes atleast 10-14km per liter after having read most forums here and other sites... what could be the problem?

Most friends and mechanics i ask suggested to have the carb's jet adjusted to smaller one... but it will sacrifice something, that is, yung hatak daw... but what i am trying to understand is that, why other cars of the same model, even the taxi is fuel efficient than mine? they haven't adjusted their jets yet.. thats what my friends say, some with 2e carb and others with 4k carb... help!!!

[desert fox]

baka naman sa way of driving mo bro?

[ghosthunter]

How about potential source of "friction" and others?

Dragging brakes?
Wheel alignment?
Wheel bearings?
Does the ac compressor & alternator turn easily?
Are the engine drive belts NOT over tightened?
Is the timing correct and NOT too advanced?

[batusai_jr]

baka naman sa way of driving mo bro?

i short shift most of the time and i dont rush, i leave early cause i drive slower that in my college days cause i want to save more fuel, i dont even reach 80kph on my daily route, i gave up being a road hog along time ago... it can also be my way of driving, can you suggest more so i can try it?

How about potential source of "friction" and others?

Dragging brakes?
Wheel alignment?
Wheel bearings?
Does the ac compressor & alternator turn easily?
Are the engine drive belts NOT over tightened?
Is the timing correct and NOT too advanced?

Brakes - had it checked also
wheel alignment- had it checked too
bearings - had it replaced including the rack and pinion i think thats what it is called and everything that attached to it including the rubber thing, ball joints, and i guess a shock absorber
AC and alternator - i had it adjusted to the very minimal, correct me if i am wrong - the gauge does not reach number 1 when it is idle with and w/o aircon...
timing - (if this is the one concerning timing belts etc) i had it corrected, replaced the belts just before i had it overhauled...

i am really having problems- i had spend that much i can buy another car of the same model (but an ex taxi)

[desert fox]

ganyan talaga bro kapag carb....bago umalis, wag ka na masyadong magpainit ng sasakyan.after 5 seconds, sibat na pero wag naman high acceleration....usual lang ba...iwas sa extra load sa compartment.

check mo air filter mo bro, baka low class,o baka madumi.

baka di ok ang timpla ng air-gas mo....baka more on gas,less air...

sa driving, the higher the number na nagshift ka ng gear,less ang gas na maconsume mo....yan e kung di ka galit sa silinyador....

check your tire pressure too.....

[bambino]

ano ang base idle mo, and is it A/T or M/T ?

[batusai_jr]

ano ang base idle mo, and is it A/T or M/T ?

base idle? you mean yung sa gauge on gas? i think it aroung 0.5-0.7... M/T. saka hindi na rin ako nagpapainit masyado ng makina... usually atleast a minute for oil to cover everything lang.

[reym]

You can Isolate the cause your problems 1 by one, you can start with air conditioning system. Try traveling your normal route with air con off the whole time, if you reach at least 9-10 km per liter then your cooling system's thermostat might be at fault. You may try this then post the results so we cab help you further.

[sirkosero]

My car is a Toyota Corolla XE 95. I had it overhauled, tuned up, replaced timing belt, replaced the motor in the radiator, modified the carb with a brand new 4k carb, replaced all stuffs with regards to "kalampag", had done everything i know with regards to fuel consumption to save gas, yet it still consumes alot... city driving is 6.5-8km per liter, long drives 7.5-8.5km at the most...

i really am having problems with it... most cars of the same model consumes atleast 10-14km per liter after having read most forums here and other sites... what could be the problem?

Most friends and mechanics i ask suggested to have the carb's jet adjusted to smaller one... but it will sacrifice something, that is, yung hatak daw... but what i am trying to understand is that, why other cars of the same model, even the taxi is fuel efficient than mine? they haven't adjusted their jets yet.. thats what my friends say, some with 2e carb and others with 4k carb... help!!!

Woah! 10-14Km per liter? I drive a vios and am only getting about 11km per liter city drivinf.

[pearljam]

Try mo mag modify ng air filter... try mo yung cone types na filter. It give better air flow sa carbs. How about yung menor mo? Baka naman masyadong mataas?

[kikoteng]

Hi.

Also drive a corolla M/T carb type.

Had a similar problem lately with high FC.

Things I did (not in sequence) :
1. Fuel line cleaning
2. Cleaned spark plugs
3. Cleaned carbs
4. Changed air filter (biggest effect)
5. Changed fuel filter

FC went from 8.5 kpl to 10 kpl. Idle improved drastically as well especially when engine is cold.


Kiko

[batusai_jr]

You can Isolate the cause your problems 1 by one, you can start with air conditioning system. Try traveling your normal route with air con off the whole time, if you reach at least 9-10 km per liter then your cooling system's thermostat might be at fault. You may try this then post the results so we cab help you further.

Sir i have tried driving it with aircon off, but no difference it consumption...

Try mo mag modify ng air filter... try mo yung cone types na filter. It give better air flow sa carbs. How about yung menor mo? Baka naman masyadong mataas?

This i got to try, i'll modify the air filter, i changed carb kasi from 2e to 4k. the mechanic told me it would be more efficient than before because 4k is smaller, but from what i have noticed is that some tube has been blocked because 4k has lesser holes for air i think?

Hi.

Also drive a corolla M/T carb type.

Had a similar problem lately with high FC.

Things I did (not in sequence) :
1. Fuel line cleaning
2. Cleaned spark plugs
3. Cleaned carbs
4. Changed air filter (biggest effect)
5. Changed fuel filter

FC went from 8.5 kpl to 10 kpl. Idle improved drastically as well especially when engine is cold.


Kiko

1. Ano yung fuel line cleaning? can i do this on my own o dapat pagawa ko sa mekaniko?
2.newly change - 2-3mos palang spark plugs
3.New carb modified 2e to 4k
4.New air filter 2-3mos
5.New fuel filter

i changed almost everything about 2-3mos ago coz i got it overhauled,

I will try changing air filters to make it take more air...

I have another question...

Spark plugs tell us if fuel / air intake are balanced right?

Can i check it on my own? is it similar to a motorcycle? I own one too and i check the spark plugs color, brown is the good one right? baka kasi pag tinanggal ko hindi ko na maibalik... and should i remove all spark plugs or only one can tell me what i want to know?

[kikoteng]

>> 1. Ano yung fuel line cleaning? can i do this on my own o dapat pagawa ko sa mekaniko?

additive that you place into your gas tank. Basically, it cleans as you drive. In my case, my FC went down by about 0.5 km/l. For me, it is not drastic so it might or might not have an effect in your case.




>> Spark plugs tell us if fuel / air intake are balanced right?

>> Can i check it on my own? is it similar to a motorcycle? I own one too and i check the spark plugs color, brown is the good one right? baka kasi pag tinanggal ko hindi ko na maibalik... and should i remove all spark plugs or only one can tell me what i want to know?[/quote]


Yep. Brown is good. That should also tell you if you have good air/fuel mix. If the air filter is an issue, your spark plugs should be blackish.

Its best to check all spark plugs to be sure. May nabibiling tool naman for spark plug removal.

[kikoteng]

Hmmm ... if your engine is newly overhauled .. is it not normal to have lower FC during the first few thousand kms ?

I'm not sure about this. No first hand experience. Although, I remember new car owners having lower FC during initial use.

Can anyone verify ?

[reym]

+1. After 1000 Km of driving you shall feel the smoothness and power of the engine thus your foot on the pedal will be much lesser.

But then again, what kind of overhauling was done to the engine? Was the pistons replaced by over sized ones?

Increasing the piston size would increase engine power and thus consumption.

Too much cylinder to piston skirt clearance may lead to wasted fuel, too little would mean too much friction.

The proper color of the spark plug tips should be a bit almost white.

Hmmm ... if your engine is newly overhauled .. is it not normal to have lower FC during the first few thousand kms ?

I'm not sure about this. No first hand experience. Although, I remember new car owners having lower FC during initial use.

Can anyone verify ?

[voltscastillo]

how's the route to and from destination? matraffic ba?

if not... is your aircon compressor still using the original thermostat (yung nagccontrol sa temp ng aircon, not the engine/water temp thermostat)? if you're using a rotary type switch it could be the cause... nung na-convert sa ganito yung LXi ko dati my fuel economy dropped to 7 from a normal 9-10. i had it returned to the original thermostat (omron brand, 800 sa banawe).

badly tuned carbs can also contribute to bad FC... dirty air filters and bad timing and valve clearances as well (when your mechanic overhauled it, did he adjust timing and valve clearances?).

apart from that, the only things i can think of are too heavy engine oil (maybe you're using 20w-50), under inflated tyres and replacement aircon compressor that did not come from your car and is too big or powerful (hence more parasitic drag) for your engine.

you seem to have covered most of the others na.

overfueling after an overhaul is bad for the engine. excess fuel washes down the cylinder walls causing the rings not to seat properly. i also suggest you have your fuel system (carb) checked and adjusted muna ulit sa specialists.

[lancer5790]

you should have sticked or replaced your carb with the stock/original ones.4k carb may have smaller jets but you need to pump more to jack up and compensate with your engine. besides, stock carb have bypasses that are acrtually necessary for your engine to work better. i have an 89' 16-valve corolla gli that i have preserved with all its stock parts in place and still fuel efficient up to now...

[batusai_jr]

up to now its fuel consumption is between 7-8km per liter, iniwan ko muna sa mekaniko. pinaobserbahan kong mabuti, baka daw kasi hindi lumapat yung kung ano man sa makina nun inoverhaul

[lgene10]

bka nmn hindi tumugma ung butas (vacuum port papuntang power piston ng power valve). dba sabi mo nagpalit kau carb 2e to 4k..
pag wlang vacuum papuntang power valve. lagi nka ON un.. x6 ang laki ngbutas ng power valve compare sa main jet. gumagana lng yan pag nabibitin makina. dagdag gasolina sa main ventury.. nangyari na sakin yan. halos 6 km/L. nagtaka din ako.. ang lakas.. pero pag below 2k rpm ginagamit ko medyo matipid.. kasi slow jet lng gumagana. pero pag mga 3k rpm pataas sobrang lakas. talo pa nka full throttle gumagana secondary. un pla ung ginawang gasket sa carb to manifold di nlagyan ng butas ppuntang power valve..un lagi nka ON.. un ako na mismo nag overhaul ng carburetor ko gumawa nko bago gasket sa ilalim sinigurado ko na may butas dun..

4af 16 valve.. 10-11 km/L n ngaun air con on.. di ko p na try off ac pawisin kc ako.ska lagi nmn nag auautomatic ac ko.. 2k-3k rpm shift minsan 4k pag nalilibang.. 47 slow jet.95 primary jet. 175 secondary tinaasan ko secondary pra may extra lakas sa high rpm. pinalitan ko din spring ng secondary diaphram pra medyo late bukas ng secondary.

try mo patignan ulit carb mo.. or tanong mo ung nagkabit kung may vacuum papunta dun..

suggest ko dapat ung 2e carb gamit mo. di mo na sna pnalitan.. ung barkada ko may TE71. 2T makina 2e nilagay na carb.. 10-11km/L din lagi din nka AC.. ung kumpare nmn ng tatay ko corolla din ee90 2e makina.. halos 14-15 km/L nung kanya. kagulat nga eh.. lagi sya full tank pag takbo ng malayo pag uwi karga ulit full tank. mgugulat nlng kami. gnun lng nabawas.. nsa tono din ng carb & driver

[neyzon]

Hi I'm new on cars just got ny 1st car few months ago it's a Mitsubishi Lancer 1997 1.3 Carb type. I have similar problem fc is avering only to 7.2km/l. Light footed naman ako and have followed fuel economy tips. I had my engine tuned up for fuel economy few months ago it seemed to improve but recently it seemed went back to 7km/l. I'm not sure if "pizza pies" have bad fc or if it's just mine.