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 FC Freaking High, Chevrolet Optra 1.6

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TSSharv The Great
post Dec 26 2013, 09:39 AM, updated 12y ago

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Hey guys,

Here is the details of the car

Chevrolet Optra 1.6
Semi-synthetic Rockoil 10w30

We recently bought this car as a third car because I started doing my internship and we needed an extra car.During the first week fc was at 7.6 km/l and so we changed engine oil and filter as well as the spark plug cable as the foreman said on of the cable has no voltage. After that the fc seemed to improved to 8.5 km/l although its not something to shout about. But yesterday all of a sudden 100km = 15.7l which is roughly 6.3km/l. This us just freaking high for a 1.6 car. We use either petronas or shell. And please give honest opinion instead of korean car,old car,etc. Any experienced opinion is highly appericiated. Btw mileage is 140000km. And I drive moderately 2k-3k rpm.
matrix88
post Dec 26 2013, 09:42 AM

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try changing your air filters too.
Vervain
post Dec 26 2013, 09:46 AM

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have the mechanic check for errors via the obd port. replace the o2 sensor as well.
ReVolVolution
post Dec 26 2013, 09:56 AM

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Korean cars! No escape on bad FC!
Mr_47
post Dec 26 2013, 10:26 AM

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QUOTE(ReVolVolution @ Dec 26 2013, 09:56 AM)
Korean cars! No escape on bad FC!
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fu haha

Chevrolet Optra 1.6 = kimchi car how the hell.


its Chevy btw fuel sure koyak mah

TSSharv The Great
post Dec 26 2013, 10:28 AM

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Air filter changed during the oil change
TSSharv The Great
post Dec 26 2013, 10:29 AM

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QUOTE(Vervain @ Dec 26 2013, 09:46 AM)
have the mechanic check for errors via the obd port. replace the o2 sensor as well.
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Will bring it to sc soon...hope it doesnt cost a bomb
TSSharv The Great
post Dec 26 2013, 10:31 AM

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QUOTE(Mr_47 @ Dec 26 2013, 10:26 AM)
fu haha

Chevrolet Optra 1.6 = kimchi car how the hell.
its Chevy btw fuel sure koyak mah
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8-9Km/l is acceptable but 6km/l is what im worried..something must not be right..and also please post constructive comments
dares
post Dec 26 2013, 10:41 AM

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QUOTE(Mr_47 @ Dec 26 2013, 10:26 AM)
fu haha

Chevrolet Optra 1.6 = kimchi car how the hell.
its Chevy btw fuel sure koyak mah
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Chevy Optra = rebadged Daewoo Lacetti= Kimchi
Post-Je-Ape-Ape
post Dec 26 2013, 10:41 AM

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QUOTE(Sharv The Great @ Dec 26 2013, 10:31 AM)
8-9Km/l is acceptable but 6km/l is what im worried..something must not be right..and also please post constructive comments
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Change spark plugs, maybe they're not right?
Mr_47
post Dec 26 2013, 10:43 AM

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QUOTE(dares @ Dec 26 2013, 10:41 AM)
Chevy Optra = rebadged Daewoo Lacetti= Kimchi
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shiat... my face when know bout this lel doh.gif

but taiko it should be this ---- It's another way around... Daewoo rebadged Chevy?

btw Daewoo under GM = General Motors.... HQ from USA juga. n that's why company dia nama GM Daewoo

GM azz go fly fact! rclxms.gif

This post has been edited by Mr_47: Dec 26 2013, 11:02 AM
amdxp
post Dec 26 2013, 11:02 AM

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Check your spark plug and the cable again, any cylinder not firing ?

For such high mileage car, maybe you need to do de-carbon for the engine. Clean the Fuel injectors as well. Exhaust any blockage (Cat converter could be the culprit) ...

Fuel filter too.
TSSharv The Great
post Dec 26 2013, 11:02 AM

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QUOTE(Post-Je-Ape-Ape @ Dec 26 2013, 10:41 AM)
Change spark plugs, maybe they're not right?
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Checked the spark plug..foreman said its still okay
kevin613
post Dec 26 2013, 11:07 AM

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QUOTE(Mr_47 @ Dec 26 2013, 10:43 AM)
shiat... my face when know bout this lel doh.gif

but taiko it should be this ----  It's another way around... Daewoo rebadged Chevy?
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most of the chevy that is sold in Malaysia comes from Kimchiland (including modern models like Cruze), and no its not Daewoo rebadge Chevy. Chevy is the parent company and they sell those kimchi cars here using their name... if they are sold as Daewoo, guess no body would even give it a second look..

Quote from wiki:
» Click to show Spoiler - click again to hide... «


This post has been edited by kevin613: Dec 26 2013, 11:07 AM
TSSharv The Great
post Dec 26 2013, 11:07 AM

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QUOTE(amdxp @ Dec 26 2013, 11:02 AM)
Check your spark plug and the cable again, any cylinder not firing ?

For such high mileage car, maybe you need to do de-carbon for the engine.  Clean the Fuel injectors as well.  Exhaust any blockage (Cat converter could be the culprit) ...

Fuel filter too.
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Changed the cable to a new one already..coz before cable change was around 7.6km/l..but after change became 6.3km/l..i suspect something else coz these changes might only improve the fc marginally..almost 2km/l loss is weird
Vervain
post Dec 26 2013, 11:11 AM

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QUOTE(Sharv The Great @ Dec 26 2013, 10:29 AM)
Will bring it to sc soon...hope it doesnt cost a bomb
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Try to ask around any of your friends who have a standard obd2 scanner. Read what are the problems and if possible reset the error and run again to see if the same error still prompts up. That should help you validate the problems before running to the SC which may chop your $$.

Common problems are, faulty o2 sensor, dirty MAF or MAP sensors which results in wrong parameters. The ECU will inject more fuel or hop into safe mode to purge out more fuel to avoid lean combustion.

Also, if you have a strong nose, try to smell whether there's sweet smell out of the fume. Most extreme cases you can see unburn petrol being cough out of the exhaust.
TSSharv The Great
post Dec 26 2013, 11:17 AM

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QUOTE(Vervain @ Dec 26 2013, 11:11 AM)
Try to ask around any of your friends who have a standard obd2 scanner. Read what are the problems and if possible reset the error and run again to see if the same error still prompts up. That should help you validate the problems before running to the SC which may chop your $$.

Common problems are, faulty o2 sensor, dirty MAF or MAP sensors which results in wrong parameters. The ECU will inject more fuel or hop into safe mode to purge out more fuel to avoid lean combustion.

Also, if you have a strong nose, try to smell whether there's sweet smell out of the fume. Most extreme cases you can see unburn petrol being cough out of the exhaust.
*
Yeah..sometimes can smell the petrol...last week...the car suddenly did not start..called the mechanic and he said the 'pipe' that connects the fuel from the tank to engine leaked..so he sealed up for RM 30 and voila the car start as usual..maybe this a sign to some error?
unitron
post Dec 26 2013, 12:38 PM

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Rather than everyone here throwing wild but educated guesses... take to a better mechanic preferably one with a diagnostic tool or direct go SC.

It's almost impossible to diagnose without actually checking the car physically unless it's a straightforward or common problem for the model.

High FC can be caused by many things. But 6.3km/l is definitely too high.
cranx
post Dec 26 2013, 01:09 PM

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what is the average speed? maybe recently you stuck in jam very often?
conan1
post Dec 26 2013, 01:23 PM

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sorry to say the fc for this car i heard is quite terrible..

however u can try scan the ecu first.. diagnose any problem..and try tune it if possible...


TSSharv The Great
post Dec 26 2013, 01:44 PM

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QUOTE(unitron @ Dec 26 2013, 12:38 PM)
Rather than everyone here throwing wild but educated guesses... take to a better mechanic preferably one with a diagnostic tool or direct go SC.

It's almost impossible to diagnose without actually checking the car physically unless it's a straightforward or common problem for the model.

High FC can be caused by many things. But 6.3km/l is definitely too high.
*
Will update soon on the matter
TSSharv The Great
post Dec 26 2013, 01:45 PM

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QUOTE(conan1 @ Dec 26 2013, 01:23 PM)
sorry to say the fc for this car i heard is quite terrible..

however u can try scan the ecu first.. diagnose any problem..and try tune it if possible...
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I know it would be high..but not this high
TSSharv The Great
post Dec 26 2013, 01:46 PM

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QUOTE(cranx @ Dec 26 2013, 01:09 PM)
what is the average speed? maybe recently you stuck in jam very often?
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Normal speed and acceleration...but the sudden jump in fc is worrying
SUSPhilHellmuth
post Dec 26 2013, 02:02 PM

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consider ok la bro for korean car
my Honda also 15.6 km/l
klavgjoe
post Dec 26 2013, 02:06 PM

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im on optra 1.6 also..FC have not been good..

RM60 = 270km
sanadi
post Dec 26 2013, 02:31 PM

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1. Check all tire pressure
2. Check all alignment are good
3. Check that there is no sticking brake pad (see if brake pad is worn more on one side or the other)
4. Check oxygen sensor (there might even be 2 sensors)

Oxygen sensor don't last the life of the car. Massive jump in FC is usually due to oxygen sensor, but check the other things as well just to be sure. If I were to guess the culprit, I'd wager on the oxygen sensor that needs to be replaced.
TSSharv The Great
post Dec 26 2013, 02:38 PM

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QUOTE(PhilHellmuth @ Dec 26 2013, 02:02 PM)
consider ok la bro for korean car
my Honda also 15.6 km/l
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Fyi...15.6km/l is too good..we have a 01 Camry 2.2 as well and its around 8.5-11km/l..so the optra is too high
TSSharv The Great
post Dec 26 2013, 02:41 PM

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QUOTE(klavgjoe @ Dec 26 2013, 02:06 PM)
im on optra 1.6 also..FC have not been good..

RM60 = 270km
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Based on the figures given,its 270 km for 28.6l that is 9.4km/l which is good..but mine is 6.3km/l

wayfeel
post Dec 26 2013, 03:05 PM

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Fuel filter.
SoZa
post Dec 26 2013, 03:18 PM

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There is nothing you can do, wiki article mention the car have poor fuel consumption, much higher than mid-size car. Not to mention an old car consume more fuel.

You bought a poor car
klavgjoe
post Dec 26 2013, 05:35 PM

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anyone got good rekemendation for chevy workshop ka..

pj volcar - banned (overpriced labor n parts)
foreman (ex pj volcar) - banned (bllshyt me on chng gearbox = 8k)
puchong sc - banned (waited 5 hrs just to normal service)
exkay
post Dec 26 2013, 05:38 PM

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Change to lighter shoes especially right foot.

TSSharv The Great
post Dec 26 2013, 08:07 PM

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QUOTE(klavgjoe @ Dec 26 2013, 05:35 PM)
anyone got good rekemendation for chevy workshop ka..

pj volcar - banned (overpriced labor n parts)
foreman (ex pj volcar) - banned (bllshyt me on chng gearbox = 8k)
puchong sc - banned (waited 5 hrs just to normal service)
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I'm from penang...but i found a recomended mechanic from the chevy forum..will go to him next week..on holiday now
Empathy
post Dec 26 2013, 11:48 PM

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Normal laa for automatic gear cars to have high fuel consumption .

.
shelby_yong
post Dec 27 2013, 04:56 AM

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convert NGV.. last solution
TSSharv The Great
post Dec 28 2013, 10:11 AM

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QUOTE(Empathy @ Dec 26 2013, 11:48 PM)
Normal laa for automatic gear cars to have high fuel consumption .

.
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Previously was ok..this happened out of no where
Empathy
post Dec 28 2013, 04:34 PM

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QUOTE(Sharv The Great @ Dec 28 2013, 10:11 AM)
Previously was ok..this happened out of no where
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How is your tyre pressure ? When was the last time you inflate the tyre ? Many ppl are so lazy to inflate the tyre at the correct pressure . You must inflate the tyre once a month or at least once every 2 months . Some ppl think they inflate the tyre once a month when in fact they do it once every few months .

What viscosity your motor oil ? Thicker oils like xW-50 use more petrol . That's why new car manufacturer recommends thinner oil like xW-30 oils for maximum fuel economy .

.
Jusb
post Dec 29 2013, 01:19 AM

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Use an OBII adapter and plug in to your car. Then use an app like Torque on Android and it can show the error codes from ECU.
TSSharv The Great
post Dec 29 2013, 07:27 AM

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QUOTE(Empathy @ Dec 28 2013, 04:34 PM)
How is your tyre pressure ? When was the last time you inflate the tyre ? Many ppl are so lazy to inflate the tyre at the correct pressure . You must inflate the tyre once a month or at least once every 2 months . Some ppl think they inflate the tyre once a month when in fact they do it once every few months .

What viscosity your motor oil ? Thicker oils like xW-50 use more petrol . That's why new car manufacturer recommends thinner oil like xW-30 oils for maximum fuel economy .

.
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Its on 10w30...i've also heard that older cars should run on thicker oil..is that true?
johanihsan
post Dec 29 2013, 10:21 AM

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I owned one for 7 years. FC is about 11 to 12 km/l
I think you have faulty fuel gauge sensor in the fuel tank.
Always showing error volume of fuel like mine did.
Change it. About RM 160 at SC.

spring onion
post Dec 29 2013, 11:25 AM

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LOL if city drive 6.5km/l is normal la since that car 1.6L engine is pulling 1300kg. my saga city drive only 6km/l carburetor engine but highway can achieve at least 12km/l
Empathy
post Dec 29 2013, 12:37 PM

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QUOTE(Sharv The Great @ Dec 29 2013, 07:27 AM)
Its on 10w30...i've also heard that older cars should run on thicker oil..is that true?
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I own an old car and I also use 10W-30 motor oils for many years . So far no problem .

.
SUSMatrix
post Dec 29 2013, 03:43 PM

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QUOTE(Sharv The Great @ Dec 26 2013, 09:39 AM)
Hey guys,

Here is the details of the car

Chevrolet Optra 1.6
Semi-synthetic Rockoil 10w30

We recently bought this car as a third car because I started doing my internship and we needed an extra car.During the first week fc was at 7.6 km/l and so we changed engine oil and filter as well as the spark plug cable as the foreman said on of the cable has  no voltage. After that the fc seemed to improved to 8.5 km/l although its not something to shout about. But yesterday all of a sudden 100km = 15.7l which is roughly 6.3km/l. This us just freaking high for a 1.6 car. We use either petronas or shell. And please give honest opinion instead of korean car,old car,etc. Any experienced opinion is highly appericiated. Btw mileage is 140000km. And I drive moderately 2k-3k rpm.
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What do you mean by this, all of a sudden? If you're looking at the meter, it's not accurate, because that is a realtime thingy. You should take a full tank, run it until at least half empty, then pump fuel and calculate km drove / litre used.

Anyway, if 6.xx km/l, it's normal in city jam with a high FC car.. Remember, in jam it's 0 Km/l...fuel get used up and you are going nowhere...the longer you get stuck in a jam, the worst it will be. Nothing you can do about it.
TSSharv The Great
post Dec 30 2013, 08:32 AM

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QUOTE(Matrix @ Dec 29 2013, 03:43 PM)
What do you mean by this, all of a  sudden? If you're looking at the meter, it's not accurate, because that is a realtime thingy. You should take a full tank, run it until at least half empty, then pump fuel and calculate km drove / litre used.

Anyway, if 6.xx km/l, it's normal in city jam with a high FC car.. Remember, in jam it's  0 Km/l...fuel get used up and you are going nowhere...the longer you get stuck in a jam, the worst it will be. Nothing you can do about it.
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At first i fill up till full tank and reset the trip meter...once it reached 100km, I fill up again and record the litre needed and do the calculation..so its a legit calculation and nit dependent on the fuel gauge errors
TSSharv The Great
post Dec 30 2013, 08:34 AM

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QUOTE(johanihsan @ Dec 29 2013, 10:21 AM)
I owned one for 7 years. FC is about 11 to 12 km/l
I think you have faulty fuel gauge sensor in the fuel tank.
Always showing error volume of fuel like mine did.
Change it. About RM 160 at SC.
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Yeah..we have the faulty fuel gauge..but since using only shell for a few fuel ups,it seems to get better..but my calculation is independent of this error
SUSMatrix
post Dec 30 2013, 09:33 AM

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QUOTE(Sharv The Great @ Dec 30 2013, 08:32 AM)
At first i fill up till full tank and reset the trip meter...once it reached 100km, I fill up again and record the litre needed and do the calculation..so its a legit calculation and nit dependent on the fuel gauge errors
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Yep...that is correct calculations. My old Sephia 1.5cc use to give me about 7.xx km/l in city drive... now my Inspira 2.0 about 8.xx km/l in city drive.
TSSharv The Great
post Mar 6 2014, 02:18 PM

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Just to update..we changed the petrol filter, valve gasket and spark plug and walah..now its giving 10.4km/l for town drive...we serviced it in Chevrolet/opel specialist in sbg jaya,pg

 

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