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Thread: Problem with Honda City 98: Jerks on petrol when accelerator is pushed

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    Default Problem with Honda City 98: Jerks on petrol when accelerator is pushed

    Hi,

    I have this problem with my Honda City 98 (carby version, manual) which is really getting on nerves now:-

    Problem:- Whenever i push accelerator on petrol, i feel a jerk/jolt like as if the fuel to engine was cut-off completely for a moment and then the engine revs up. This phenomenon is extra-present in cold engine and it gets milder when engine gets hotter but it's always there. It is there in all gears but most prominent in 1st gear.
    Please note that this issue is absent in CNG. On CNG the car accelerates like it should, no jerk of any kind at all. Its only a petrol problem.

    measures so far:- I've changed spark plugs, plug wires, got the carburetor serviced, even got the butterfly changed, checked the accelerator cable for stickiness as well.

    I've taken it to a number of mechanics but they failed to sort out the problem. Some blames carburetor, some say its butterfly..

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    cheap digital camera works too. These are not too many lines, you can make a diagram yourself.

    The old 2E-LU engine in the JDM EE80 corolla had about 50 or 60 vacuum lines - it was like maggi noodles
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    yeah, i will start making my own diagrams, great to learn from you.

    the accelerator pump assembly is slightly similar to that on a suzuki khyber, but this carb is very different from the aisan in margalla.
    haters gonna hate, potatoes gonna potate

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    zulfiqar bhai, is it a good idea to use abit of antisieze on the plate that holds the diaphragm and its spring, the first time i tried to open it, the screws came off but the plate itself was stuck to the carb body as if it were glued, i tried to pull it, when it did came of the diaphragm got torn/
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by margallar View Post
    zulfiqar bhai, is it a good idea to use abit of antisieze on the plate that holds the diaphragm and its spring, the first time i tried to open it, the screws came off but the plate itself was stuck to the carb body as if it were glued, i tried to pull it, when it did came of the diaphragm got torn/
    do not use anything there - it should seal with its provided seal lip on the diaphragm or with a paper gasket (if design provides)
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Xulfiqar sir, what is the name and model of the carb i have on my car...

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    one more question. How can i be sure that the real culprit behind this jerking issue are the accelerator pump and the secondary diaphragm i mean i don't want to open and replace a part which is OK already.
    From your post what i understand is that there should be some kinda play with the plunger rod in idle position, if so accelerator pump is faulty. How can i check the secondary diaphragm?

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    Quote Originally Posted by Morani View Post
    Xulfiqar sir, what is the name and model of the carb i have on my car...

    Its a Keihin carby and the model is on a metal tag on the front of the carby, it may have gone missing if a mechanic wanted to scrub the carby with steel brush.
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    Quote Originally Posted by Morani View Post
    one more question. How can i be sure that the real culprit behind this jerking issue are the accelerator pump and the secondary diaphragm i mean i don't want to open and replace a part which is OK already.
    From your post what i understand is that there should be some kinda play with the plunger rod in idle position, if so accelerator pump is faulty. How can i check the secondary diaphragm?

    Your symptoms point to a bad accelerator pump, it maybe other things too like a bad idle circuit or a wrongly setup transition to mid range circuit. The secondary opener is checked with a vacuum tester, the diaphragm should hold vacuum - make sure its signal port is clean too.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    In the absence of a vacuum tester I suck at it and then block it to see if it holds,


    I was thinking of fitting a syringe with a rubber pipe. That would be good for rough estimates, though it won't tell the magnitude of pressure
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by Xulfiqar View Post
    Its a Keihin carby and the model is on a metal tag on the front of the carby, it may have gone missing if a mechanic wanted to scrub the carby with steel brush.
    What use is that tag, I searched mine on the internet, nothing came up
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by margallar View Post
    In the absence of a vacuum tester I suck at it and then block it to see if it holds,


    I was thinking of fitting a syringe with a rubber pipe. That would be good for rough estimates, though it won't tell the magnitude of pressure
    Its a great idea. Mechanics here don't have any vacuum testers so that should do the trick.

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    I won't have the internet access for the next two weeks, i'll try to implement your suggestions on this subject and will get back to this thread with results. Till then. Allah hafiz.

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    Be very careful, use wd40 on the screws
    haters gonna hate, potatoes gonna potate

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