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  1. C

    Mercruiser 3.0: Dead cylinder? very sluggish!

    Thanks for the info - I wish I had the time to take on a rebuild but likely have to go to the shop.
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    Mercruiser 3.0: Dead cylinder? very sluggish!

    Sooo (skip to valve - for attempts that didn’t help) First did a sea foam clean. Warmed engine up, Pulled spark plug, sprayed in cylinders, sat for an hour, started & idles, then ran fat idle & sprayed in carb. Repeat 3 times. Hoping stuck valve would free. Second, did a oil flush. Napa brand...
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    Mercruiser 3.0: Dead cylinder? very sluggish!

    Thanks for the suggestions here is my update Update: - spark tester flashed same on all 4 at idle and slow throttle up. - timing was close to 1 ATDC - put garden hose on hose that comes out of thermostat housing and goes to manifold. I let water run fir 5 min then cranked over a few times. Let...
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    Mercruiser 3.0: Dead cylinder? very sluggish!

    Had the boat out on the water for 4 or 5 days. Pulled a water skier then went for a boat ride, floated for a while then head back to the dock and would barely get on a plane. Motor sounded different, Motor sounds like it’s bogged down. Motor starts normal. Sounds different when running. Low rpm...
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