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Thread: 2 Problems: Civic making constant mild jerks / Loss of Power

  1. #1
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    Default 2 Problems: Civic making constant mild jerks / Loss of Power

    AoA PWs

    About 3 months back, the middle "dholki" of exhaust started rattling so i changed it but the replacement was a desi type of dholki as i was in a hurry caz i had to travel to Quetta the next day. Since its change i felt that the engine felt a little heavy and bogs a little if i press the accelerator hard.
    On my way to Quetta near Sibbi the car started giving severe jerks on petrol as if engine was shutting down for a second & coming back to life, so i converted to cng and all was fine.
    After reaching quetta i felt a severe loss of power while going uphill. So after few diagnostics myself i retarded the timing from distributor & all was fine. no jerks on petrol, no power loss.
    but after abt a month which is a week back the problem came back but in a different way. There r mild jerks in driving specially on constant speed as if traveling on an uneven road. The problem persists on CNG as well as Petrol.
    The engine now bogs down badly on cng when i press the accelerator too hard at low speeds only. but if i change gears at high rpms then its ok. i have tried tuning the CNG numerous times. Bogging is less on petrol.

    Now here is the list of things which i hav already done
    1. Plugs changed abt 1 month before the problem started.
    2. Plugs r a little sooted but not much.
    3. Plug wires checked for resistance but passed.
    4. Distributor cleaned.
    5. There r no CEL codes.

    Question 1: The car was working fine before but after travelling to Quetta i had to retard the timing. thats weird. BTW timing belt change is due & i m planning to do it in a week or so. Can it be a loose or failing timing belt?

    Question 2: The "dholki which i replaced was genuine honda & one could see through the center hole to the other side, but the new one was desi & was blocked in the center. Can it be the cause of heavy engine & low pick cause it might b producing more back pressure as it is not allowing free flow.

    Also dont forget the constant mild jerks which i m facing now. Your input is required. Specially @Xulfiqar bhai & others.

  2. #21
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    a jerk on picking up again is uaually a sign of underfuelling, you need to adjust the CNG reaction time (quite hard unless you have a proper precision machined venturi)

    btw - I have a special hatred for the mechanics who adjust the timing belt by just hanging the belt on the engine pulleys and tightening the tensioner up - almost want to kick them hard in the shins. There is a specific adjustment process, all it takes is to ASK how to do it.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    a jerk on picking up again is uaually a sign of underfuelling, you need to adjust the CNG reaction time (quite hard unless you have a proper precision machined venturi)

    btw - I have a special hatred for the mechanics who adjust the timing belt by just hanging the belt on the engine pulleys and tightening the tensioner up - almost want to kick them hard in the shins. There is a specific adjustment process, all it takes is to ASK how to do it.
    Kindly don't kick me as this time i did it myself, but after consulting the factory manual.
    Anyways the timing is dead on now. but i can still feel very mild jerks at constant speed.
    The jerks r more prominent on cng than on petrol. I have tried adjusting cng many times ( i have been adjusting cng for a few years now, so i know how to do it).
    The plugs which i removed were also new but i think they were fake because after removing them, the engine performance have increased. its more quieter, more responsive and light. but still the jerks r annoying.
    Next i will try changing the distributor and plug wires. but will go to market next week as u know the problems in Quetta.

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    Btw the car was running on same venturi before as well.

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    Im not blaming you for the timing, Im angry on the "regular mechanics"

    anyway - if you suspect the ignition system then I would suggest you check the wires first with a multimeter and then with a spark tester and ground lead - sometimes the plug boot that goes into the valve cover leaks current and grounds out hence not firing the plug under load.

    The distributor cap and rotor should not have sandpaper marks or carbon tracks in it
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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