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Mira Petrol Consumption too high

Tiny
FAST_MANI
  • MEMBER
  • 2007 DAIHATSU MIRA
  • 18,000 MILES
Dear Expert,

I have bought MIRA 2007 a month back, second hand, showing 17000 mileage. Over all the car is bumper to bumper genuine and engine condition is excellent, drive is v. Smooth too. But the basic for buying it was for good petrol consumption (i heard it's between 15-17 km/ltr).

It is giving me 9 km/ltr with AC. I have changed it's oil (shell havoline), oil filter, cleaned the air filter (as it was already in good state), plugs are in v. Good state, engine throttle also. Still the mileage is 9-10 km/ltr on AC in city. I usually drive below 80 kms/hr and use empty roads.

Looking for a possible solution
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Thursday, June 7th, 2012 AT 6:36 AM

13 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
It sounds like a MAP sensor might need to be replaced here is a guide to help you ccan the car for codes.

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

Please run down this guide and report back

Cheers
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Thursday, June 7th, 2012 AT 11:52 AM
Tiny
FAST_MANI
  • MEMBER
  • 6 POSTS
Yes I am using premium fuel. I have also octane available but never used. Secondly can you explain what do you mean by scan?

Thanks for the quick response
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Thursday, June 7th, 2012 AT 11:58 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
A scan can be done by most mechanics, this checked for any problem in the engine management system.
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Thursday, June 7th, 2012 AT 12:30 PM
Tiny
FAST_MANI
  • MEMBER
  • 6 POSTS
Can you name any expected electric faults which could have been the reason for low consumption of fuel? I have checked the plugs they are like new. Further premium is ok as fuel?

Thanks.
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Thursday, June 7th, 2012 AT 1:26 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
What method did you use to measure the mileage consumption?
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Thursday, June 7th, 2012 AT 1:28 PM
Tiny
FAST_MANI
  • MEMBER
  • 6 POSTS
I drove under 80 km/h with D4 gear and with A.C. There is only one traffic signal in my way to office, which is of 1 minute, I put 10 ltrs of petrol when tank has one light, and after 102 km the one light signal was there again.

I have normal tyre, no alloy rims etc
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Thursday, June 7th, 2012 AT 6:38 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
The low fuel warning indicator is not a very correct guage for fuel consumption. You should fill up to full tank and after driving a certain distance, top up again and check how much you have used up for the mileage.

Did you perform the test in one complete run?
If you are doing short distances and driving time per day, it is not an accurate gauge.
You mentioned the mileage in miles and you are calculating in km, is that correct?
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Thursday, June 7th, 2012 AT 9:00 PM
Tiny
FAST_MANI
  • MEMBER
  • 6 POSTS
I found one of the fuel injectors has sorting out causing the ECU driver to hold the pulse width to wide. All fixed cost me $78.00 for the injector.
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Friday, June 8th, 2012 AT 6:54 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Nice work, we are here to help, please use 2CarPros anytime.

Cheers
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Friday, June 8th, 2012 AT 12:36 PM
Tiny
SAEEDANWER
  • MEMBER
  • 2 POSTS
Same issue with my Car (mira 2007).
Could you please confirm the behaviour of your car after resolved fuel injector?
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Friday, December 28th, 2018 AT 8:42 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello
You've added a comment to one that is years old.You need to start a new question including your vehicle information.Thanks for using 2CarPros and here is the link.
Danny-

https://www.2carpros.com/questions/new
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Friday, December 28th, 2018 AT 7:50 PM
Tiny
FAST_MANI
  • MEMBER
  • 6 POSTS
Hey saeed
The best I was available to achieve after everything was 11km/liter with AC :) So if its around that for you, then I guess it is good
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Friday, December 28th, 2018 AT 8:49 PM
Tiny
SAEEDANWER
  • MEMBER
  • 2 POSTS
Sorry for little late

Danny Thanks for suggestion, I am new.

Fast_Mani,
Thanks for responding. I am getting 8km/ltr on average quality Petrol and 10km/ltr on Hi-Octane petrol wihtout AC.

Is it Okay or not?

Already did following things:
1- Engine change recently due to heat-up issues (heating indication as well)
2- Cooling system, Radiator an thermostat also checked by 2 mechanics.
3- Engine Oil changed recently (Shell 5w-30)
4- Toyota Gear Oil also re-filled.
5- Throttle Body and Catalytic Converter are checked as well.
6- Scanned but not getting any alarm. Means engine OK.
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Monday, January 7th, 2019 AT 2:24 AM

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