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f18a caburetor problems? cold start problems.

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    #1

    f18a caburetor problems? cold start problems.

    Hey there, new here and i have a problem...

    I have searched high and low all over the internet for a fix but still no luck I have a 1990 cb1 honda accord with a f18a carbureted engine. when the car is cold the engine will run on 3 cylinders, the 4th cylinder doesn't fire as I have taken out the plug lead and it runs the same. Once it has warmed up it runs perfectly fine.

    Now my suspicion is that there is loss of compression in cylinder 4 when its cold because the oil/piston rings are worn and the oil isn't sealing properly until it has warmed up and become more viscus. My brother is an apprentice mechanic and reckons its the carburetor that is causing the problem. He still hasn't tried a compression test yet....

    has anyone experienced this before? know whats wrong? because other then that, the car is pretty much mint!

    Cheers Nick.
    Tags: 3 cylinders, carburetor, cold, compression, f18a
    #2
    Well you won't know if there is a loss of compression until you've performed a compression check. I don't know much about carbs but I would start by cleaning and checking the timing on it first. Try using starting fluid when you first start the car to see if it's fuel or air related.




    Originally posted by newlandsbmxer View Post
    Hey there, new here and i have a problem...

    I have searched high and low all over the internet for a fix but still no luck I have a 1990 cb1 honda accord with a f18a carbureted engine. when the car is cold the engine will run on 3 cylinders, the 4th cylinder doesn't fire as I have taken out the plug lead and it runs the same. Once it has warmed up it runs perfectly fine.

    Now my suspicion is that there is loss of compression in cylinder 4 when its cold because the oil/piston rings are worn and the oil isn't sealing properly until it has warmed up and become more viscus. My brother is an apprentice mechanic and reckons its the carburetor that is causing the problem. He still hasn't tried a compression test yet....

    has anyone experienced this before? know whats wrong? because other then that, the car is pretty much mint!

    Cheers Nick.


    Live Life to the Fullest

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      #3
      The air that each cylinder draws in all comes through the same carb so I cant see how the carb would cause one particular cylinder to misfire when its cold. Check compression when cold and when warmed up, see if that gets you anywhere with it.

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        #4
        cheers guys, and slimmtex thats exactly my thought. I started it up before and opened the auto choke and it ran fine, so i think the choke might not be opening fast enough

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