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Thread: Toyota Corolla 2003 gulps petrol, have tried everything

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    Default Toyota Corolla 2003 gulps petrol, have tried everything

    Hi guys, my Toyota Corolla 2003 EFI Automatic is consuming too much petrol these days (6 km/litre, no CNG installed). I have had the spark plugs replaced, engine tuned, fuerl filter replaced, oil changed at regular intervals, tire pressure is OK but nothing seems to work. Online some people recommend to replace the MAF sensor (which i clean regularly) and the oxygen sensors, and the dealership suggests getting fuel injectors replaced as well. All these repairs cost well above Rs.80,000 which isnt worth it. I am hoping to get parts from eBay or online.

    I am open to suggestions and leads as to where I can get these parts at reasonable prices in Islamabad/Lahore.

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    Quote Originally Posted by aliusman420 View Post
    The best time to go there is before 11 a.m. You get your turn very quick. And they're very good at what they do. I'm their permanent client.


    Sent from my iPhone using PW Forums
    Yup! Any Time between 9 to 12 and you're kept for the day. After 12, they don't entertain anyone.

    Sent from my HUAWEI G610-U20 using PW Forums mobile app

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    Quote Originally Posted by almynoon View Post
    Brother where can I test my car AFR in pindi and how much it will cost

    Sent from my GT-I9300 using PW Forums mobile app
    If you mean air to fuel ratio, then first you need to find if your vehicle is carburetor type, has oxygen sensor or has a variable resistor. I cannot comment on carburetor type vehicles, whereas you can find AFR on vehicles with oxygen sensor by doing oBD test and determining LTFT, HTFT and then further fine tune your vehicle. You cannot find AFR on vehicles with variable resistor and best you can do is tune everything, remove every doubt regarding the problem area like cross checking coolant temperature sensor, MAF sensor, pcv valve, tappet settings, air filters, correct oil, ignition coils, injectors, fuel filter and fuel pressure test and then get the variable resistor readjusted using exhaust analyzer. If you fall in third category then you can contact Mr. atta 03115135516 based in Rawalpindi for final adjustment using exhaust analyzer which leans or riches your fuel based on results from exhaust analyzer. Hope, this will answer your question and that?s a short summery related to the problem being faced by thread owner.

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    do the following,

    lift ur car on jack.. and see if the tyre rotation is free or not, secondly there is this coolant censor near temp valve.. take it out, clean it with sand paper and see it starts doing any good
    people who use Highbeams.. once day would suffer too bigtime. People who drive slow on fast lanes, remember one day a vehicle carryin ur son, dad might get late to hospital coz people like u. underaged driving will land u in bigtime trouble one day or the other.. And the Blue indication light on ur speedometer denotes "High Beams"

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    Hi guys thanks for all the suggestions..i got it tuned from Nazir Autos and had everything checked. They say there is nothing to show high petrol consumption. The car is still gulping petrol so I am forced to sell it now. Maybe its the engine which has become inefficient but cannot spend more time and money on it now. But thanks for the input anyway I learnt a lot about the different components.

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    u never tld us if it was an xli gli altis etc etc..
    "The world ain't all sunshine and rainbows. It's a very ruff, mean place, and no matter how tuff you think you are, it will always bring you to your knees and keep you there permanently if you let it.You or nobody ain't never gonna hit as hard as life, but it ain't about how hard you hit, it's about how hard you can get hit and keep moving forward, how much you can take and keep moving forward. If you know what you're worth, go out and get what you're worth, but you gotta be willing to take the hit."
    - Sylvester Stallone

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    Quote Originally Posted by aamirq View Post
    u never tld us if it was an xli gli altis etc etc..
    Aamir it's an SE Saloon Automatic

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    Quote Originally Posted by zakriazubair View Post
    Hi guys thanks for all the suggestions..i got it tuned from Nazir Autos and had everything checked. They say there is nothing to show high petrol consumption. The car is still gulping petrol so I am forced to sell it now. Maybe its the engine which has become inefficient but cannot spend more time and money on it now. But thanks for the input
    anyway I learnt a lot about the different components.

    by any means did u try what i asked u,
    people who use Highbeams.. once day would suffer too bigtime. People who drive slow on fast lanes, remember one day a vehicle carryin ur son, dad might get late to hospital coz people like u. underaged driving will land u in bigtime trouble one day or the other.. And the Blue indication light on ur speedometer denotes "High Beams"

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    Quote Originally Posted by takko View Post
    by any means did u try what i asked u,
    will try it tomorrow if it works, thanks!

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    Quote Originally Posted by zakriazubair View Post
    Hi guys thanks for all the suggestions..i got it tuned from Nazir Autos and had everything checked. They say there is nothing to show high petrol consumption. The car is still gulping petrol so I am forced to sell it now. Maybe its the engine which has become inefficient but cannot spend more time and money on it now. But thanks for the input anyway I learnt a lot about the different components.
    As I said earlier, when people face problem related to fuel injection on this vehicle then they consider selling it. Sorry to see you doing so, I faced the similar issue but finally was able to resolve the issue.

    You may find this thread useful and as i said, that you have to eliminate every factor on vehicles equipped with variable resistor for open loop fuel injection as compared with vehicles with O2 sensor as feedback mechanism.

    https://www.pakwheels.com/forums/performance-modification-tune-up-preventive-maintenance/225206-bang-my-head-call-all-experts-corolla


    If you still feel, that you have eliminated every factor then I would advise you to contact Mr. Atta for final adjustment using exhaust analyzer. Equipment helps in adjusting air to fuel ratio by adjusting variable resistor after measuring O2 and CO contents from exhaust.

    This will definitely solve your problem.

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    Quote Originally Posted by talhawaleed View Post
    As I said earlier, when people face problem related to fuel injection on this vehicle then they consider selling it. Sorry to see you doing so, I faced the similar issue but finally was able to resolve the issue.

    You may find this thread useful and as i said, that you have to eliminate every factor on vehicles equipped with variable resistor for open loop fuel injection as compared with vehicles with O2 sensor as feedback mechanism.

    https://www.pakwheels.com/forums/performance-modification-tune-up-preventive-maintenance/225206-bang-my-head-call-all-experts-corolla


    If you still feel, that you have eliminated every factor then I would advise you to contact Mr. Atta for final adjustment using exhaust analyzer. Equipment helps in adjusting air to fuel ratio by adjusting variable resistor after measuring O2 and CO contents from exhaust.

    This will definitely solve your problem.
    I got AFR adjusted today from Atta Rawalpindi; let's see how the car responds after a week of driving, i did notice the mileage getting better after driving 30 km though

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    Quote Originally Posted by talhawaleed View Post
    don't waist you time, no one has it except nazir autos in Islamabad.
    Concept Motors I-10/3 has it too now. ASNU Fuel Injector Machinery

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    Quote Originally Posted by zakriazubair View Post
    I got AFR adjusted today from Atta Rawalpindi; let's see how the car responds after a week of driving, i did notice the mileage getting better after driving 30 km though
    do report back the results, glad to hear that you went for this important adjustment.

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    Quote Originally Posted by zakriazubair View Post
    I got AFR adjusted today from Atta Rawalpindi; let's see how the car responds after a week of driving, i did notice the mileage getting better after driving 30 km though
    what kind of change's you had felled after adjustment's? and what was their strategy plz share with us too.

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    Quote Originally Posted by rajaatta View Post
    what kind of change's you had felled after adjustment's? and what was their strategy plz share with us too.
    Its too early to be sure of changes, will give it a week..the drive is considerably better and the acceleration smooth, previously the acceleration wasnt so smooth..previosly i could literally see the fuel dial going down real-time while driving but now the consumption has improved..i can only tell by how much after a week of driving..the guy asked me to bring the car back for inspection after 500 km for readjustments if needed

    regarding the process, its called an AFR scan(air to fuel ratio)..so what was happening is that my car had an AFR of 12.2 before where the standard is 14.7. So basically it was consuming fuel that was too rich, thus the low mileage. If the AFR is high it means the fuel mixture is lean which results in engine not getting enough fuel to run properly. the factory setting is at 14.7 which needs to be adjusted after every 50,000 km as it can change over a period of time. Atta (the mechanic) first analysed readings from the car's exhaust and the car computer. he then changed fuel ration electronically to see if ECU is working correctly, which it was i.e.e the afr was changing when fuel settings were being changed. After this, he tuned the fuel sensor manually with a screw driver ( a tool exists to do it properly but he didnt have it) at different RPMs to bring the average from 12.2 to 14.7. All this took 15 minutes. I cant be sure if this is the exact way to correct AFR but it does work. The engine needs to get used to the new AFR which is why a week (or 500km) is a good time to measure consumption.

    The whole process is documented in the form of a diagnostic report given to me at the end of the job. The diagnostic also revealed no problems with MAF, coolant temperature, others so we ruled them first to be sure it was the AFR that needed adjusting. Hope that helps

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    Quote Originally Posted by zakriazubair View Post
    Bro can u give the address and location of the workshop u have visited. I need to do the same on my honda. I took my car to Rt diagnosis in rawalpindi. He had tools but was unable to find AFR adjuster on my car.

    Sent from my GT-I9300 using PW Forums mobile app
    Attached Images Attached Images   

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    Quote Originally Posted by almynoon View Post
    Bro can u give the address and location of the workshop u have visited. I need to do the same on my honda. I took my car to Rt diagnosis in rawalpindi. He had tools but was unable to find AFR adjuster on my car.

    Sent from my GT-I9300 using PW Forums mobile app
    Sure, call Atta he ll guide you with the address: 03115135516

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    Quote Originally Posted by almynoon View Post
    Bro can u give the address and location of the workshop u have visited. I need to do the same on my honda. I took my car to Rt diagnosis in rawalpindi. He had tools but was unable to find AFR adjuster on my car.

    Sent from my GT-I9300 using PW Forums mobile app
    AFR trim pot on your vehicle might be inside dash?? Or you had to google for the trim pot

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    Quote Originally Posted by zakriazubair View Post
    Its too early to be sure of changes, will give it a week..the drive is considerably better and the acceleration smooth, previously the acceleration wasnt so smooth..previosly i could literally see the fuel dial going down real-time while driving but now the consumption has improved..i can only tell by how much after a week of driving..the guy asked me to bring the car back for inspection after 500 km for readjustments if needed

    regarding the process, its called an AFR scan(air to fuel ratio)..so what was happening is that my car had an AFR of 12.2 before where the standard is 14.7. So basically it was consuming fuel that was too rich, thus the low mileage. If the AFR is high it means the fuel mixture is lean which results in engine not getting enough fuel to run properly. the factory setting is at 14.7 which needs to be adjusted after every 50,000 km as it can change over a period of time. Atta (the mechanic) first analysed readings from the car's exhaust and the car computer. he then changed fuel ration electronically to see if ECU is working correctly, which it was i.e.e the afr was changing when fuel settings were being changed. After this, he tuned the fuel sensor manually with a screw driver ( a tool exists to do it properly but he didnt have it) at different RPMs to bring the average from 12.2 to 14.7. All this took 15 minutes. I cant be sure if this is the exact way to correct AFR but it does work. The engine needs to get used to the new AFR which is why a week (or 500km) is a good time to measure consumption.

    The whole process is documented in the form of a diagnostic report given to me at the end of the job. The diagnostic also revealed no problems with MAF, coolant temperature, others so we ruled them first to be sure it was the AFR that needed adjusting. Hope that helps
    well your problem will be definitely solved Hope so. keep us updated.

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    Quote Originally Posted by rajaatta View Post
    AFR trim pot on your vehicle might be inside dash?? Or you had to google for the trim pot
    I cant find trim pot. If any other civic 1998 owner can help here or assist

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