Civic 2003 Exi manual bought with high fuel consumption

[xhaikh1]

Asalam u alikum
Recently i have bought the Civic exi manual 1500cc from our close friend of father, ghar ki gaari hai ese jese k aapky sapny ka bacha hai jo aapki nazroo bara howa ho just like this. Me and my father were love to keep honda but every third person was saying no to hondas because of high cost of maintenance but this time we bought civic 2003 manual 1500cc. Earlier i kept the Corolla 2009, 2010 cultus 2005,2007 and mehran but this time we choose civic 2003 because of love.

Now the 2 problems i am facing is the fuel consumption which is 6 to 7 km/per litre with AC 90% and on highway its around 11.5 to 12.5 with full ac speed range from mostly 80 to 100km but only on motorway i drove 100 to 120km. I always drive with light feet and under 3000rpm.

1. And the second problem is that 5 person on board car's rear shocks are very soft it doesn't even bear single little bump it make noise like dhak dhak, but its all okay when i drive with only 2 or 3 persons, whats that issue are the shocks gone or the springs.

After buying i have recently done the following things for fuel consumption and suspension works are,

1. Checked by scanner no codes
2. PCV valve changed for my satisfaction
3. Plugs changed
4. Throttle body cleaned
5. Air and oil filter changed
6. Oil changed with 20w50 shell
7. Suspension bushes and front left shock alsi it was leaking.
8. CNG was removed after purchasing the car
9. High octane 15 litre and petrol 24 litre poured while driving at highway but got 11 to 12km per litre only.
10. After driving plugs are orange or rusty orange color which means its running perfect but no good mileage. No fuel leakage found from any where fuel filter also cleaned
11. Tires are also stock 185/65/14 wheel caps no alloys.
    Now what things should be done to achieve th good mileage and what are averages of these exi manuals.

I have read somewhere that there some sort of regulator or cicular switch to maintain any emissions or what dont know much about it.
@capsat @Xulfiqar @syedfaizan1 please you guys also shed some knowledge here

[aziz.rehan]

How is engine condition.check brakes they might be dragging

[xhaikh1]

Brake pads are also changed so there is no resistance of brakes. I checked it on highway on 120km i left the acceleration so it took time to decrease the speed

[capsat]

am sorry i randomly exercise to be deaf & blind towards Honda vehicles

[syedfaizan1]

Bro i never kept this car but i had 2003 City with D15b Engine and it was very tricky to get 10Km per liter from that Car. Sometimes it used to give 6 KM sometimes 10Km per liter.

I tried every possible things in 4 years to get 12 KM per liter but never succeed. the things you told already Replaced but there must be some Sensor Voltage difference which making this much high fuel in consumption.

check Petrol Air Ratio Sensor MAF Clean it, use Different petrol station, try PSO . you need keep trying until you get succeed. I win like this, everytime i check multiple things and try to replace them or service them to get my required target for fuel

Further more experience people can suggest about this Model.

[ali454]

Exi Manual easily does 12kmpl in city and 15kmpl at 120kmph. Obviously if you drive it in traffic jams itll do even 7-8. Its not a hybrid.

Why using 20w50? This is one of the reasons of poor mileage.
Thermostat installed?
Try different fuel station.

[aziz.rehan]

Where does temperature gauge stays while driving?

[xhaikh1]

No thermo valve is not installed but fan is on auto. And i have by mistakenly poured 20w50 next time i will pour 10w40. But earlier it was filled with 10w40 it was giving same mileage as now. There are no heatup issues because of living in karachi thermo is removed by previous uncle who is my uncle

[xhaikh1]

Temperature needle stays bit lower than middle part like as 8 o'clock needle of clock

[xhaikh1]

[xhaikh1]

Please also read this picture also for some more information which i got from other old posts

[tauqeerbhatti9]

Brother share some engine second is mileage is original or reversed kindly check that. Because i am having too CIVIC 2005 model but the fuel average which you are telling on highway that i got within city and on highway easily 17 with ac, i am using 10W40 Total Quartz. Never go for any kind of tuning. Clean the fuel filter.

[ali454]

I drive in Lahore which is hotter than Karachi never needed to remove thermostat.

Install T valve.
Use caltex coolant
Fan on auto
Oil 10w30

Also stop following uncle's advise ( no offence)

[xhaikh1]

No its confirmed that its odo is genuine because its driven in front of eyes so we know the alll history

[xhaikh1]

Is it worth to adjust tappets but it not making any knocking sound. ??

[aziz.rehan]

Get T stat valve installed.ur engine is running cold due to which mileage and performance is poor.

[xhaikh1]

performance is also good and car is not running cold tempreture needle always stays at middle.

[aziz.rehan]

Then check tappets

[xhaikh1]

Latest update is this, that my car was giving black smoke which was indication of high fuel consumption. Then checked by mechanic he said the fuel injectors have spent their life because of car running on CNG as i have removed CNG that is they are making problem. Is true that cng driven cars injectors can be problematic by the time.
So after that car behaved normal and then i poured the shell hx7 5w30 and oil filter changed. Now i am getting approx 10 km/litre in city and 13km/litre on highway all without AC. What do you guys suggest me now to improve the mileage. Tire have been changed to 195/65/15 with new alloy rims also from stock 14 size. So tire pressure is 28psi in all four.

Mechanic said that tappets sounds good so not to be adjust.
No black smoke.

I have learnt from pakwheels that this civic has air fuel ratio to adjust the voltage or pulsing time of injectors which will affect alot.

And should i change the fuel filter?

[aziz.rehan]

Nice.U have improved ur ride.