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Mercury MerCruiser

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Old 06-17-2021, 12:05 AM   #1

A_Light48 is currently offline
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My Year: 1990
My Model: 1850XL
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Default Missfire

I replaced the carburetor on my 4.3 mercruiser this winter. It developed a missfire around 4300 rpms. I have replaced the cap, rotor, ignition coil, plugs and wires. But itís still missing. Starts great and runs amazing at all rpms other then that ones spot, any ideas? Thanks
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  • Old 06-17-2021, 03:07 AM   #2

    mikeyt is currently offline
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    Default Re: Missfire

    Probably the first thing i would check / replace is the wire from the tach to the coil. Next step would be to double check your timing. It may need to be retarded just a bit.
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