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  1. Confident Noob

    Cylinders wont fire.

    Hi all. Starting a new thread after getting some amazing help from this community and conducting proper testing to narrow down my problem. Long story short, my Mercruiser 7.4L MPI (L29) starboard engine won't fire up. I've worked past starter and ignition systems. Used a proper in-line spark...
  2. Confident Noob

    Starter wont engage flywheel.

    1999 Mercruiser 7.4L MPIs. After dewinterizing the starboard starter spins up fast but doesn't move the engine. Things I've tried: Replaced entire starter. Replaced older batteries. Cleaned and checked all power cables. Voltage checked batteries and starter. Engine moves freely, flywheel...
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