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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.
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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...



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