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Thread: Rough running engine when throttled back from full power at circuit height

  1. #11
    Junior Member
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    Hood River
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    Default Re: Rough running engine when throttled back from full power at circuit height

    Quote Originally Posted by Dan L View Post
    Two things come to mind right away. If the engine has over 500 hours change the spark plug leads. But you’ve done that already.

    Second, have you leaned it aggressively when you throttle back?

    With full rich my O-340 will run rough under those conditions too. Even worse if I pull carb heat thinking it is ice. Leaning is all it takes for me.

    Only test flew the a/c wit the new Coils x 4, Spark Plug Leads x 8 and new Mini-sensors x 2 yesterday late afternoon.
    All went well but need further hours.

    Thanks Charles

  2. #12
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    Sep 2019
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    Waynesboro, VA
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    Default Re: Rough running engine when throttled back from full power at circuit height

    I am having an identical problem, right down to the temp drop in the #1 and #2 cylinders. I too have a 2013 CC-11. Not sure about the carburetor. Happens right as I pull power at the top of the climb out.

    Thanks to all for this very helpful thread!

    -asher

  3. #13
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    Sep 2019
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    Waynesboro, VA
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    Default Re: Rough running engine when throttled back from full power at circuit height

    I think if found the problem! Looks like a service advisory was put out on a subset of carburetors for the CC340. I took the advice of others and had my problem analyzed via Savvy and they were great.

    See attachment for details on the carburetor nozzleN92LG CARBORATOR NOZZEL.pdf

  4. #14
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    Default Re: Rough running engine when throttled back from full power at circuit height

    Quote Originally Posted by Asher View Post
    I think if found the problem! Looks like a service advisory was put out on a subset of carburetors for the CC340. I took the advice of others and had my problem analyzed via Savvy and they were great.

    See attachment for details on the carburetor nozzleN92LG CARBORATOR NOZZEL.pdf
    Asher hi

    My 2013 CC 22 SN 271 has the AvStar carby and consequently I can not use the the improved fuel nozzle for the MS carby as per SB-22. Its a bugger when the manufactures chop and change vendors for critical components like this.

    The new plenum and spacer certainly seemed to have helped. The other issue with the CC 340 is that they - on all accounts from more experienced owners - do run very rich and need to be leaned at the earliest opportunity.

    From SB-22



    <<<Note: The new nozzle is compatible with and may only be installed in MSA carburetors having solid blue epoxy float part number 30-864. Do NOT install the new nozzle in a carburetor equipped with a metal float or any other type float except a solid blue epoxy float. If your carburetor is not equipped with the solid blue epoxy float, part number 30-864, please comply with Marvel-Schebler® service bulletin SB-2. Additionally fuel nozzle 47-862 is NOT approved for use in carburetors manufactured, overhauled, or serviced by AVStar Fuel Systems even where the carburetor model and part number appears to be the same or is similar to the MSA carburetor designation. >>>>

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