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Thread: Car Vibration/Stumbling at idle/Low RPM and jerk at sudden Acceleration

  1. #1
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    Default Car Vibration/Stumbling at idle/Low RPM and jerk at sudden Acceleration

    Your advice is requested regarding stumbling/vibration of Cultus (2004) at idle and low speed and jerk at sudden acceleration. It is worthy to mention that as per suggestion of different mechanics, I got changed following parts:

    1. Engine Mounts have been changed
    2. Carburetor Service ---- ( mechanic said that butterfly valves are ok and dont need any repair or khradia work.
    3. Again Carburetor cleaning/tuning from second mechanic who rejected first mechanic

    Still above mentioned two problems exist

    Now mechanic is saying that your carburetor is faulty and cannot be restored to original conditions ,so please purchase carburetor of mehran car and your both problems will be solved.

    Please guide me in this perplex situation .

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    Quote Originally Posted by Pakblogger2012 View Post
    Your advice is requested regarding stumbling/vibration of Cultus (2004) at idle and low speed and jerk at sudden acceleration. It is worthy to mention that as per suggestion of different mechanics, I got changed following parts:

    1. Engine Mounts have been changed
    2. Carburetor Service ---- ( mechanic said that butterfly valves are ok and dont need any repair or khradia work.
    3. Again Carburetor cleaning/tuning from second mechanic who rejected first mechanic

    Still above mentioned two problems exist

    Now mechanic is saying that your carburetor is faulty and cannot be restored to original conditions ,so please purchase carburetor of mehran car and your both problems will be solved.

    Please guide me in this perplex situation .
    If there is sudden jerk along with "dhus" noise from engine bay, that problem is related to weak mounts. But since you have changed them then get its clutch adjusted. Besides you will get a jerk on sudden acceleration....

    Vibration at idle could be related to again weak mounts or too low rpm (set rpm at 1000). If engine was overhauled before, then minor vibration would be felt at low rpm.

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    Dear Got New Carburetor Kit Costing near 800 - 900. replaced all items in carburetor. same problem with me now solved alhamdulillah.

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    @talal
    No sir ,I dont hear any sound at that time while sitting on driving seat. It looks like sudden stop(for about fraction of second ) and then sudden increase of speed.These jerks are often felt immediately after speed breakers or while over taking any vehicle where rapid change in speed of vehicle is desired.

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    @sajjad76
    Sir, what does that kit include ? If that kit worth Rs.800/- can solve my problem then what else I need .

    It is further mentioned that I got car engine overhauled about 3 months ago.

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    Default

    It consist of 2 main jets + 1 idle jet.
    power valve piston
    idle mixture screw
    gaskits for different parts of carburetor
    carburetor float level
    metttalic mesh for filter

    may be 1/2 more things.

    by replacing all parts, carburetor act as new.

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    Quote Originally Posted by sajjad76 View Post
    It consist of 2 main jets + 1 idle jet.
    power valve piston
    idle mixture screw
    gaskits for different parts of carburetor
    carburetor float level
    metttalic mesh for filter

    may be 1/2 more things.

    by replacing all parts, carburetor act as new.
    All these parts were changed while servicing carburetor.

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    Check ignition timing and centrifugal ignition timing advance mechanism installed in distributor for proper functioning.
    Never loose hope in life,every step gives u something.

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    Quote Originally Posted by argtr65 View Post
    Check ignition timing and centrifugal ignition timing advance mechanism installed in distributor for proper functioning.
    Which is good workshop in Lahore for above mentioned work ?

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    Default

    check your Petrol filter, that seems to be faulty

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