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Thread: Cultus Problem on petrol

  1. #1
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    Default Cultus Problem on petrol

    AOA. my cultus VXR, when started on petrol gives black smoke for 1-2 minutes.During this period if i leave foot from accelerator paddle, it shuts down.If i force to maintain rpm at 1000 by holding accelerator paddle following observations are seen.
    1-it seems there is no power.
    2-one piston is working (by removing two plug wires no effect, when third one is removed engine shuts down)
    3-exhaust supply is interrupted (keeps on missing after 1-2 seconds)

    What i do is that i keep it at 3000 rpm, it feels like something is being filled and after 2 minutes it behaves normally.Black smoke gone and rpm stable at 1000, starting on half self. I have to repeat this process whenever i start it on petrol after 4-5 hours
    On cng no problem


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    Default

    You should get a compression test, when the car is very cold, like in the morning
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by engr.naveed View Post
    so what could be the solution. @Xulfiqar bhai plz help
    there could be many reason - first identify the problem.

    Wrong spark plugs / or gap not set properly
    faulty distributor or dirty point.

    Check if car is manually advanced for CNG.

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    Default

    Quote Originally Posted by margallar View Post
    You should get a compression test, when the car is very cold, like in the morning
    brother i will do that on this weekend..but one problem is there that the car behaves normally after 2 min and 3s shop is about 8 km away.In this time car gets warmer and i will have to wait for atleast 2 hours so that engine may become cold.....

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    Quote Originally Posted by revengez View Post
    there could be many reason - first identify the problem.

    Wrong spark plugs / or gap not set properly
    faulty distributor or dirty point.

    Check if car is manually advanced for CNG.
    Engine was tuned a month ago.mechanic cleaned spark plugs.....Regarding timing setting, he rotated distributer clockwise and stopped at almost 10% less than the fully clockwise turned position.

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    Quote Originally Posted by engr.naveed View Post
    Engine was tuned a month ago.mechanic cleaned spark plugs.....Regarding timing setting, he rotated distributer clockwise and stopped at almost 10% less than the fully clockwise turned position.
    What was the condition of spark plugs? did he inspect or he just cleaned and refit.
    Also distributor adjusted on CNG?

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    Quote Originally Posted by revengez View Post
    What was the condition of spark plugs? did he inspect or he just cleaned and refit.
    Also distributor adjusted on CNG?
    spark plugs just cleaned and refit as i replaced them 3- 4 months before (approx 3500-4000km)
    yes distributor adjusted on cng..and no problem at all on cng except rpm value of 800 at cold startup and 1000 when warm

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    Default

    Ok


    Sent from a Nuclear Device.

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    Default

    Quote Originally Posted by engr.naveed View Post
    brother i will do that on this weekend..but one problem is there that the car behaves normally after 2 min and 3s shop is about 8 km away.In this time car gets warmer and i will have to wait for atleast 2 hours so that engine may become cold.....
    First find a mechanic with the tool, the tool itself is very small and portable, ask the mechanic to come to your home.
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by margallar View Post
    First find a mechanic with the tool, the tool itself is very small and portable, ask the mechanic to come to your home.
    Update: a compression test will be good help in the diagnosis, but I feel this is a carburetor problem.

    Can you drive the car on petrol for a day and then show us the oil on the dipstick.

    First I was thinking that valves might be sticking, but since it runs fine on cng, it seems more likely that it is running too rich
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by margallar View Post

    Can you drive the car on petrol for a day and then show us the oil on the dipstick.
    ok i will..but u want me to take pic just after engine shut down after driving or after some time when oil settles??? sorry i did not get u

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    Quote Originally Posted by engr.naveed View Post
    spark plugs just cleaned and refit as i replaced them 3- 4 months before (approx 3500-4000km)
    yes distributor adjusted on cng..and no problem at all on cng except rpm value of 800 at cold startup and 1000 when warm
    No matter ur plugs are new or old - u just inspect the tip, it will tell u if there is something wrong. Also your car is advanced to work better on CNG. You will face knocking and missing issue on petrol. Reset the timing on petrol.

    Cultus Problem on petrol -1474654

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    Quote Originally Posted by engr.naveed View Post
    ok i will..but u want me to take pic just after engine shut down after driving or after some time when oil settles??? sorry i did not get u
    Just drive 3_4 km and take a pic just after parking it
    haters gonna hate, potatoes gonna potate

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    Default

    Quote Originally Posted by engr.naveed View Post
    yes it is not working...is it due to this or any other issue can cause this??
    Forget everything else and Get your auto-choke replaced or clean its the very first thing

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