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Thread: Solution: Vitz Acceleration and Breaking Issue on CNG

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    Default Solution: Vitz Acceleration and Breaking Issue on CNG

    If your vitz 99-04 is on cng and you are facing this problem but on petrol it seems to be working fine then the only problem with your car is its tuning on CNG.

    This happens when there is less quantity of cng going into your car due to which your engine doesn't generate enough power and hence the car's brake vacuum doesn't properly work when there is load on the engine i.e. your AC is running in bumper to bumper traffic.

    You might have noticed when you give it some throttle while your other foot is on the brake paddle, the brake paddle subsequently starts to get soft and you are able to press it.

    I've been driving a 2004 CNG-ed vitz since more than 2 years now. I was facing this problem for sometime but then I learned to tune my car on cng , Vitz and other auto cars require frequent tune-ups on cng IMO.


    Both the following problems in vitz are related to CNG.


    1. Not being able to accelerate the car from a stop position while the AC is running.
    2. Not being able to break when AC is running or there is load on the engine
    .


    You first need to make sure your air filter is clean, plugs condition is good and the gap is right.

    Note: This is going to be a bit tricky so do it if you feel you can do it otherwise go to a cng wala and tell him to do it for you as per your instructions.

    Below is an image of a Landi Renzo kit. The "T" bolt is responsible for you car's acceleration and hence economy as well.

    Solution Vitz Acceleration and Breaking Issue on CNG -1017945
    Picture source: Pakwheels.com

    1) [Engine running. AC switched on. Gear: Parking/neutral] <engine running="" and="" ac="" switched="" on.="" gear:="" parking="" neutral=""> Pull the accelerator cable with your hand one hand and hold it there at one position (constant rpm, can be at any point but highest possible if not the peak point)

    2) With your other hand while the engine is running at a constant high rpm. Rotate the Peak Speed Adjuster clockwise and you'll notice as you move on the engine will loose rpm. Now keep your ears wide open and listen to sound of engine carefully. Rotate it back anti-clockwise and you'll notice the increase in rpm..keep rotating it until at a point where you notice no increase in the rpm and rotating the Peak Speed Adjuster clockwise doesn't make any difference. THIS is the optimum amount of cng required for your car.

    (Any further increase from this point will increase the amount of gas flowing into your engine hence more gas being burned. You'll have some what better acceleration but poorer economy)

    3) Leave the accelerator cable.



    Now again the same process with the idle speed adjuster but your don't have to pull the accelerator cable for this. Its recommended that you do this while your AC is switched on.

    1) Rotate it clockwise and your engine will start shaking more and turn off if you keep rotating it but don't do that
    2) Rotate it anti-clockwise and as you move on, the engine will start running smoothly. Keep rotating it to a point where engine stops shaking and feels that it is running freely. (you might want to to check inside the cabin if the steering is vibrating. If yes then rotate it a bit more anti-clockwise) That is it

    Go for a test drive. You should not be facing any problem now but if you still do then loosen the Peak Speed Adjuster and Idle speed adjuster a bit more.

    Please do not curse me if you still face this problem. There might be something wrong with your car or the cng kit.</engine>

    1. Live and LET Live !

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    very well explained, i definitely agree. its been a while since i tuned my vitz, will do as soon as i get time from studies.

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    Default

    just to add, be sure not to turn it so too much anti clock wise that the T valva comes in hand causing the Compresed gas to leak. causing any damage.
    Get over the fact that Xli lacks power windows, Its an Xli because it lacks thoose features or else it would be a Gli or an Altis if had all the goodies.

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    Very welldone
    very helpful explaination
    I'm nt wht u think,I'm wht ITHINK!!Beside all this rude stuff m a smple humanbeing vo wnt 2'ev everything perfect otherwa NOTHING.

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    i do the same but the problem remain the same brake issue i have just converted my car to CNG a month back and brakes are perfect on petrol

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    Default

    MOD EDIT: Irrelevant to thread

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    @ rawfay

    the same problem "not being able to break when AC is running " but the car is on petrol ... if u could help !!!
    :"

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    @junaid492
    get your break booster checked, maybe its leaking preassure. google "how to check break booster" to find a simple test to determine ur problem.

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    superb information
    Trying to be real slow turn up the bass real low get the sounds that head low tune the channel of EXO gonna take to the level where speaker streams ,ready to rattle up the box

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    that might be helpful....but guess wat...
    I hav a 2007 Vitz nd its running on petrol....nd in scorching summers when i used to drive the car wid A/C..ame thing would happen....like in heavy traffic the brake peddal used to get hard in traffic i.e not being able to build up pressure....nd when the car used to get even more underpowered sometimes...the car would not even accelrate quickly...

    but now its fine..allah ka shukar
    Religion and Science are not at odds, Science is just too young to understand.

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    nd 50% of the Vitz in Pakistan hav the same complain...that there car used to shake while standing at a signal..nd giving a sound like `CHEEEEN` when its cold which is the sound of belt....nd one more sound of the silencer that shakes with the car nd gives another sound....
    Religion and Science are not at odds, Science is just too young to understand.

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    NIce info yar i knoe this process before but now after reading i learn very much.Thanks for info
    Beshak ALLAH he sy hy sub waqt sy pehly nahin zarorat sy zada nahin.

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    Dear Friend

    Thanks for this wonderful information.But can you please upload a video of if as it will be very useful for learning this process.

    Remain Blessed

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    Dear Friend

    Thanks for this wonderful information.But can you please upload a video of it as it will be very useful for learning this process.

    Remain Blessed

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    yes plzz upload the video of this tunning procedure....i am very thankfull to you

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    I tuned my civic this way, and easily getting 14+ km/kg on AC in city

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    Very useful info, thanks a lot.

    But my idle speed adjuster seems to be ineffective in increasing the race of the engine...... can any body suggest any solution to it.


    But the t valve helped me increase the pick of my platz

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    Nice post .. just a few add-ins from my side

    --- if u feel idle adjustment is almost in-effective on CNG then drain your kit of oil
    --- brake booster needs a certain amount of RPM to work perfectly if braking causes RPM to loose significantly, check problem area which could be idle adjustment, booster itself or some other cleaning/adjustment
    "You have not lived today until you have done something for someone who can never repay you."

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    Salam, this is a great info.

    I am having a same problem in my Vitz 2001, i showed it to a mechanic (regular) who told me that Car is not accelerating b'coz Engine head Valves might be leaking, therefore its not generating enough power on CNG for acceleration and break boosters. Car is running fine on petrol.

    Also another CNG mechanic told me that installing a STAP advancer may solve the problem but he is not guaranteeing nor giving any checking warranty for Advancer.

    Can this be true ?

    Can you introduce me to some good mechanic in Karachi who can fix this... as i am not literate with Car engines & CNG, do not want to try it out myself...

    Regards,
    Saeed Khan

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    Quote Originally Posted by khansaeed View Post
    Salam, this is a great info.

    I am having a same problem in my Vitz 2001, i showed it to a mechanic (regular) who told me that Car is not accelerating b'coz Engine head Valves might be leaking, therefore its not generating enough power on CNG for acceleration and break boosters. Car is running fine on petrol.



    Also another CNG mechanic told me that installing a STAP advancer may solve the problem but he is not guaranteeing nor giving any checking warranty for Advancer.

    Can this be true ?

    Can you introduce me to some good mechanic in Karachi who can fix this... as i am not literate with Car engines & CNG, do not want to try it out myself...

    Regards,
    Saeed Khan
    i m also a vitz 03 owner , every vitz owner facing this problem , i think there is no proper soultion for this problem , one mechanic told change ur brake boster to corolla jap shape old 90s ur brake problem will , lets see what will experts says about that

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