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Thread: Exhaust Leak Causing Misfire?

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  1. #1
    Join Date
    Mar 2008
    Location
    Jacksonville, FL
    Posts
    209

    Default Exhaust Leak Causing Misfire?

    I have a 1940 EL, and noticed that the engine would miss (as best I could tell, only one cylinder), and have gone through the points and plugs and tested the coil. All seem to be fine. In checking things out, I noticed that the exhaust pipe from the front head felt a little loose at the exhaust port, and wondered if that could be causing a miss. Can anyone tell me if that could be the culprit? If so, any suggestions on tighter fit? How about using some sort of gasket sealer around the exhaust pipe? I'm a little leary about doing that with it being so close to the chamber. The exhaust pipe seems to fit up into the exhaust port about 3/8", but has a little wiggle.

    Thanks.

  2. #2
    Join Date
    Mar 2008
    Location
    Jacksonville, FL
    Posts
    209

    Default Exhaust Leak Causing Misfire?

    One more thing causing me to think it might be the exhaust ... It only misses in low-to mid-RPM, and usually when I initially apply throttle. Once it revs up, or when idling, there is no issue. Thanks again.

  3. #3
    Join Date
    Feb 2007
    Location
    Hummelstown, PA
    Posts
    901

    Default

    Typically an exhaust leak like that would cause her to bakfire quite badly when you rolled off the throttle hard. Have you checked for an intake leak? I would also test the coil hot and make sure all wires and mounting bolts were tight, low to mid RPM is usually were the good vibrations are.
    Brian

  4. #4
    Join Date
    Mar 2008
    Location
    Jacksonville, FL
    Posts
    209

    Default

    Thanks, Brian ... I'll check the coil again ... and the intake. Appreciate your input.

  5. #5
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    4,343

    Default

    40 Nuck!

    The best way to test for a vacuum leak is with air pressure and soapy water:
    http://virtualindian.org/11techleaktest.htm

    Good luck!

    ...Cotten

  6. #6
    Join Date
    Mar 2008
    Location
    Jacksonville, FL
    Posts
    209

    Default

    Cotten!

    Thanks for the link ... great info and detail.

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