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Fuel consumption problem problem

Tiny
GHASSAN87
  • MEMBER
  • 2005 CHEVROLET OPTRA
  • AUTOMATIC
Hello, I have a chevy 2005 1.6 automatic transmit ion that takes alot of gas, I checked it on the computer and everything shows its normal, changed air filters gasoline filter and spark plugs and all good, but still the consumption is so high, it takes 55 liters for a full tank and it cross around 320 km only till the light comes on, anybody had this issue before?Is this normal? What could it be? The consumption of fuel is like a four wheel drive car and its only 1.6 engine, ive read that it takes 8 liters for every 100km but thats not true with me at all, any advice would be appreciated, thanks
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Sunday, August 21st, 2011 AT 9:46 PM

20 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be a tire/balance/wheel alignment/suspension/slipping tranny/tune-up, etc
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Tuesday, August 23rd, 2011 AT 12:42 AM
Tiny
AB12BAS
  • MEMBER
  • 1 POST
Hello, I have the same problem optra 2007 68000 km, I checked it on the computer and everything shows its normal, and when I full the tank with gasoline 60L, it cross 350 km m and the manual refer to it take 10L TO 100km ie ( with full tank it cross 550-600 km)
any advice about this problem
thanks
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Saturday, September 1st, 2012 AT 4:54 PM
Tiny
OMAR MALKAWI
  • MEMBER
  • 5 POSTS
Hello, I have the same problem optra 2007 68000 km, I checked it on the computer and everything shows its normal, and when I full the tank with gasoline 60L, it cross 350 km m and the manual refer to it take 10L TO 100km ie ( with full tank it cross 550-600 km)
any advice about this problem
thanks
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Monday, June 24th, 2019 AT 1:07 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
9 times our of 10 the MAP sensor needs to be replaced. Here is guide to help walk you through the repair and diagrams below to show you on your car. Check out the diagrams (below). Please let us know what happens.
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Thursday, June 27th, 2019 AT 12:36 PM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
I found shorted wires at TPS sensor connector.I repaired it but gasoline still high consumption
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Saturday, June 29th, 2019 AT 1:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
TPS? This car is drive by wire correct?
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Saturday, June 29th, 2019 AT 4:49 PM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
Fuel consumption problem and engine doesn't stable.

Hello, I have a problem Optra 2007 68000 km, I checked it on the computer and everything shows its normal. The car doesn't respond to the gas pedal. To get rid of this problem the oxygen sensor must be disconnected.
Now I drive the Optra while oxygen sensor is disconnected.
Thanks
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Sunday, June 30th, 2019 AT 4:25 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Thanks for the video. it sounds like the camshaft actuators are worn out or the engine is low on oil, with dirty/weak oil this will happen. Here is a guide to help walk you though the oil change and a guide so you can see how the actuators work. Also I would clean the throttle bore.

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

and

https://www.2carpros.com/articles/how-camshaft-variable-valve-timing-works

and

https://www.2carpros.com/articles/throttle-actuator-service

Please run down these guides and report back.
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Sunday, June 30th, 2019 AT 11:18 AM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
Thanks for your answer and help. But my investigation it doesn't about sounds of the engine. My question and the problem is about gas pedal trouble. The car doesn't respond to the gas pedal.
To get rid of this problem I must disconnect the oxygen sensor.
Now I drive my car Chevrolet Optra while the oxygen sensor is disconnected.
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Sunday, June 30th, 2019 AT 12:45 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
You don't have a throttle cable correct? Also have you run the codes to see what comes up? Here is a guide to help us:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also it sounds like the car is in limp mode.

https://www.2carpros.com/articles/reduced-power-limp-mode

Please run down these guides and report back.
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Monday, July 1st, 2019 AT 10:59 AM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
Good evening.
I have optra 2007 automatic transmission.
I have a throttle cable correct, and all mechanical and electrical connectors are at good shape,
but still the gasoline consumption is so too high, it have run the codes p1181.
I'll clean EGR sensor.
Thanks
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Tuesday, July 2nd, 2019 AT 12:34 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
This code is for the oxygen sensor circuit open can you check the sensor and replacement them if bad?

Here are two guides to help:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

and

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Please run down these guides and report back.
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Tuesday, July 2nd, 2019 AT 3:29 PM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
Good morning,
Thanks for your answer.
I replaced the oxygen sensor by new one three times. A gasoline consumption still too high. Please solve this problem.
Best regards
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Tuesday, July 2nd, 2019 AT 10:13 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you have a fuel injector that is not working right we can find out which one by pulling the spark plugs out and looking for the one that is black, here is a guide:

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please run down this guide and report back. Please upload images of the plugs and please keep them in order.
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Wednesday, July 3rd, 2019 AT 11:39 AM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
Thanks.
I'll replace the spark plug.
The engine of my Optra car works normally with high quality and efficiency. It has high acceleration speed.
But it has only high gasoline consumption trouble.
Best regards
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Wednesday, July 3rd, 2019 AT 1:46 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yes, but how did they look? That will tell us if you have an injector going out. If you don't have the old plugs you can pull the new ones to check the coloring.
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Thursday, July 4th, 2019 AT 12:16 PM
Tiny
OMAR MALKAWI975
  • MEMBER
  • 13 POSTS
Good morning.
Chevy Optra 2007 gasoline consumption trouble.
Sir, I did the following maintenance services.
1. Cleaned throttle, fuel injectors and other sensors.
2. Replaced Air Filter.
3. Oxygen sensor has been replaced.
4. E.G.R valve has been cleaned but it has problem, it's valve stuck at extended position as shown by attached image.
5. Spark plugs has been replaced before 4 months ago shown by attached image, they are arranged in order but I cleaned them.
Gasoline consumption still too high. Please solve this problem, it takes too money daily.
Best regards
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Friday, July 5th, 2019 AT 11:18 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
All the plugs look good, if anything a little lean so what kind of mileage are you getting and how are you taking it? This can be caused by a timing belt that has slipped one tooth. How does the engine power seem?
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Sunday, July 7th, 2019 AT 1:08 PM

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