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  1. J

    4.3 Mercruiser Car Engine has a stutter when starting

    Mercuiser 4.3 engine The engine turns for s second while starting then a quick hesitation then spins and starts up. . I've replaced the the relay and starter and problem still exists. Is it an electrical issue, timing, Any help appreciated.
  2. J

    Mercruiser Boat clunks going in to gear and stalls

    I have a 2004 mercruiser 4.3 with alpha 1 gen2 latest drive. All summer when I put the boat in reverse when cold it'd stall out. The issue has got progressively worse and now it happens in forward or reverse and even when warm I need to try several times to get going. To add to the problems...
  3. J

    Tach not working properly 4.3 mercruiser

    I bring the boat back to idle and it idles at 1000 rpms about 250 higher than usual, then when I turn of boat the tach stays at 1000rpms. Then I turn key to ignition and tack drops to zero then I start the boat and the same things keeps happening. Any ideas???
  4. J

    4.3 Mercruiser hesitates and carb backfires when full throttle from stop

    I have a 4.3 mercruiser, carbrueted with thunderbolt 5 ignition. This issue started the first time using the boat this season. I took the boat out on the lake and it seemed to be running good while cruising around at 3k rpm in cold water. The engine temp went to 160 before t-stat opening then...
  5. J

    4.3 mercruiser steaming out of back of boat

    I recently replaced both manifolds and riser and had the heads off to water infiltration. when boat first starts there isn't any steam. The steam starts once the thermostat opens. It was 48 degrees outside and raw. I've updated post with picture.
  6. J

    4.3 Mercruiser valve adjustment

    I have a 2000 4.3 mercruiser mpi with a balancing shaft. I need help solving the issue I'm having trying to adjust the valves on my mercruiser. Below is the background on the motor. There was salt water infiltration in the motor (pistons/crankcase) which cause the motor to locked up. The...
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