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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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    Do check fuel filter & pump

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    alright but if it is the filter, then wouldn't it choke all the way? why only at the beginning of acceleration?
    and same goes for Pump . why at the beginning of acceleration.?

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    -edited [the pressure in injector rail, sorry i missed the carby version]

    the other member gave right suggestion check for fuel system, i.e fuel filter & fuel pump
    - www.crackwheels.com - A skilled Dictator is much more beneficial to Country......than a Democracy of Ignorant people

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    accelerator pump of the carburetor is bad, not a big problem to fix, if you are lucky, then the problem might be fixed without opening the carb, there is a diaphragm which sometimes leaks, that is probably bad in your car.

    can post some pictures of the carburetor, especially the areas with the linkages
    haters gonna hate, potatoes gonna potate

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    forget about the fuel filter, there is a bowl inside the carb, that works just like the flush tank of a toilet, it fills with petrol and stops more petrol from entering when the desired level is reached

    so any sudden increase of fuel requirement can be easily catered
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by margallar View Post
    accelerator pump of the carburetor is bad, not a big problem to fix, if you are lucky, then the problem might be fixed without opening the carb, there is a diaphragm which sometimes leaks, that is probably bad in your car.

    can post some pictures of the carburetor, especially the areas with the linkages
    i forgot to mention that i got the carburetor serviced as well, there are lots of diaphragms around and i'm not sure which diaphragm is the culprit. i'll try to post their pictures as well..

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    Quote Originally Posted by margallar View Post
    forget about the fuel filter, there is a bowl inside the carb, that works just like the flush tank of a toilet, it fills with petrol and stops more petrol from entering when the desired level is reached

    so any sudden increase of fuel requirement can be easily catered
    This is exactly the same theory my mechanic came up with today. he said that that it may be the case that your cab may not be holding enough petrol. but if this is the case then my car should convert from petrol to CNG without much delay... but it take some time before emptying which i guess contradicts the proposed hypothesis ...

    what do you say?

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    the one i am talking of will be accessible from outside the carburetor, it will probably be under a plate (which might be rectangular/oval/ circular) and most probably will have a lever coming out of the plate.

    the plate will probably be secured by three screws
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by Morani View Post
    This is exactly the same theory my mechanic came up with today. he said that that it may be the case that your cab may not be holding enough petrol. but if this is the case then my car should convert from petrol to CNG without much delay... but it take some time before emptying which i guess contradicts the proposed hypothesis ...

    what do you say?
    look around the carburetor, there might be a sight glass somewhere, that will show you the fuel level.

    i am not sure how much should be the level, maybe there might be some markings about it on the carburetor.

    get the pictures please.
    haters gonna hate, potatoes gonna potate

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    Problem with Honda City 98: Jerks on petrol when accelerator is pushed - accel20pump

    look for something like this on the carburetor (the part with the four screws and the lever)
    haters gonna hate, potatoes gonna potate

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    my carburetor do not have sight glass to view the fuel level, i've checked it already....
    I'm going to see if i can capture some pictures of my carburetor...

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    it probably is not an issue with the fuel level, there is one easy test that did not come to my mind earlier,

    you can take off the air filter, start the car and pull the accelerator cable, pull it quick and then let go, you should see a squirt of fuel in the carburetor throat
    haters gonna hate, potatoes gonna potate

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    the accelerator pump on a honda keihin carburettor is on the right side back corner if you are looking in the engine room from the front, its a 3 screw setup, In original condition there is no gasket in there, the rubber diaphragm itself makes a lip seal on the outer edge and there are two tiny O rings that seal the shoot and intake ports. You need to replace all three parts and make sure the base is tightened very evenly - it WILL warp if you go nuts on the screws. (I have seen mechanics use a paper to try to seal its external leak - it creates a clearance in the pump and the plunger does not work to full volume.

    The lever that pushes the pump rod is also finely setup, it should contact (not push) the plunger rod at idle position. If there is a delay in its pressing you will feel a jerk.

    The secondary throttle diaphragm would also be shot (they usually are in 5 years on Honda) and they are not serviceable - they are replaced on Keihin carburettor.

    Replace the carburettor mount gasket with a genuine part only or with a proper branded replacement part like DNJ or Victor Reinz.

    btw - if your accelerator pump is not flat (check on a plate of glass or engineer straight edge) and is only slightly out of shape you can face it with some fine emery paste and a piece of glass - only 3 or 4 passes - Dont grind away otherwise the tiny ports wont hold the O rings.
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    and use a screw driver that fits very tightly on the screw head, sometimes the screws are stuck very hard and a cheap screw driver sometimes damages their face, bad situation
    haters gonna hate, potatoes gonna potate

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    Problem with Honda City 98 Jerks on petrol when accelerator is pushed -1447410Problem with Honda City 98 Jerks on petrol when accelerator is pushed -1447413Problem with Honda City 98 Jerks on petrol when accelerator is pushed -1447414
    Here are snaps from right left and front of the carburetor...

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    and thank you xulfiqar and margallar for your time and suggestions...

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    i think this is it
    Problem with Honda City 98 Jerks on petrol when accelerator is pushed -1447430
    haters gonna hate, potatoes gonna potate

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    Problem with Honda City 98 Jerks on petrol when accelerator is pushed -1447431

    its pretty simple

    Problem with Honda City 98 Jerks on petrol when accelerator is pushed -1447432

    there should be a restrictor for the dashpot in the vacuum line
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    too many vacuum lines, i would use paint to mark where each pipe connects
    haters gonna hate, potatoes gonna potate

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