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FC Freaking High, Chevrolet Optra 1.6
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TSSharv The Great
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Dec 26 2013, 09:39 AM, updated 12y ago
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New Member
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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.
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matrix88
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Dec 26 2013, 09:42 AM
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try changing your air filters too.
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Vervain
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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.
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ReVolVolution
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Dec 26 2013, 09:56 AM
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Korean cars! No escape on bad FC!
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Mr_47
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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! fu haha Chevrolet Optra 1.6 = kimchi car how the hell. its Chevy btw fuel sure koyak mah
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TSSharv The Great
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Dec 26 2013, 10:28 AM
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New Member
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Air filter changed during the oil change
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TSSharv The Great
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Dec 26 2013, 10:29 AM
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New Member
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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. Will bring it to sc soon...hope it doesnt cost a bomb
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TSSharv The Great
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Dec 26 2013, 10:31 AM
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New Member
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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 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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dares
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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 Chevy Optra = rebadged Daewoo Lacetti= Kimchi
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Post-Je-Ape-Ape
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Dec 26 2013, 10:41 AM
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Getting Started

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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 Change spark plugs, maybe they're not right?
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Mr_47
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Dec 26 2013, 10:43 AM
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QUOTE(dares @ Dec 26 2013, 10:41 AM) Chevy Optra = rebadged Daewoo Lacetti= Kimchi shiat... my face when know bout this lel  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! This post has been edited by Mr_47: Dec 26 2013, 11:02 AM
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amdxp
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Dec 26 2013, 11:02 AM
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Getting Started

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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.
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TSSharv The Great
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Dec 26 2013, 11:02 AM
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New Member
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QUOTE(Post-Je-Ape-Ape @ Dec 26 2013, 10:41 AM) Change spark plugs, maybe they're not right? Checked the spark plug..foreman said its still okay
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kevin613
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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  but taiko it should be this ---- It's another way around... Daewoo rebadged Chevy? 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... « QUOTE In January 2005, the Chevrolet brand was introduced in Europe, the whole Daewoo range being simply re-badged as Chevrolet. General Motors' official tagline was that:
“Daewoo has grown up enough to become Chevrolet.”[8]
It was also considered that this new name was an opportunity for Daewoo to become stronger. Unofficially, after Daewoo's bankruptcy, former chairman Kim Woo-Choong's escape and most notably the "Daewoo Affaire" in France (closure and conflagration of the Daewoo-Orion Electronics plant in Longwy, France),[9] the Daewoo brand name had a very bad image, so that GM simply decided to extend the Chevrolet strategy that was already used in most other markets (Canada, India, Israel, Russia) since 2003 to create a real global brand, replacing the Daewoo "dual kidney" with the Chevrolet "bowtie".
The Winstorm and Tosca were presented as the Chevrolet Captiva and the Chevrolet Epica. Some of the former Daewoo models changed their names after the re-branding decision. Examples are the Matiz which became Chevrolet Spark in some markets (although Chevrolet Matiz was also used), or the Kalos which became the Aveo (alongside the Chevrolet Kalos in other countries). Later, the tendency went towards a uniformisation in the Chevrolet Europe range: the Spark and the Cruze bear the same model names throughout all European markets. This post has been edited by kevin613: Dec 26 2013, 11:07 AM
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TSSharv The Great
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Dec 26 2013, 11:07 AM
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New Member
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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. 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
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Vervain
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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 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 $$. Common problems are, faulty o2 sensor, dirty MAF or MAP sensors which results in wrong parameters. The ECU will inject more fuel or hop into safe mode to purge out more fuel to avoid lean combustion. Also, if you have a strong nose, try to smell whether there's sweet smell out of the fume. Most extreme cases you can see unburn petrol being cough out of the exhaust.
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TSSharv The Great
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Dec 26 2013, 11:17 AM
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New Member
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QUOTE(Vervain @ Dec 26 2013, 11:11 AM) Try to ask around any of your friends who have a standard obd2 scanner. Read what are the problems and if possible reset the error and run again to see if the same error still prompts up. That should help you validate the problems before running to the SC which may chop your $$. 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?
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unitron
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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.
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cranx
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Dec 26 2013, 01:09 PM
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what is the average speed? maybe recently you stuck in jam very often?
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conan1
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Dec 26 2013, 01:23 PM
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Getting Started

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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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