I have a brand new mercruiser 3.0 I have purchased from Michagan Motorz that has about 19 hours on it, I purchased it because my first motor blew last fall (valve went through a piston) and the current motor did the same thing this spring (warranty fixed the issue) because of what Michagan motorz diagnoised as a lean conditioin (however local mechanics here said it was a manufacture default)
Anyway that is the background to my issue, and as you might expect I'm paranoid to even run the thing after 2 motors putting valves through the piston. My boat is a 2003 sea ray 176, serial# for the old motor is om628758.
My issue is when I am at around 3/4 throttle and I hit full throttle hard (push down fast) it does it hesitates for just a second, chokes and then goes.. I have posted a video to the issue, you can hear it best towards the end. If I bring the throttle up gradually it does not have the same problem. It will also sometimes do it from a say idle if you push down the throttle hard, but most of the time it's just a very slight hesitation.
Since the rebuild of my brand new motor this spring I have rebuilt the carb, (every single part but the float) checked, re-checked and triple checked it, taken the fuel line out and inspected it, replaced the fuel filter in the gas pump, pulled fuel from a separate gas tank, done a fuel pressure check at idel was 5psi. Yesterday I even bought a timing light to check the timing, used the timing shunt to put in base mode was 1 degree, and 24 degrees at 3000rpm (used a digital timing light)
At this point I'm just wondering if it is what it is, I am very paranoid about anything with this motor dont want a 3rd to go boom. Any suggestions or comments I'd love to hear. It starts up great, idle is better when it's cold seems to idle harder when warmed up, engine sounds very good when cruising it's just this one issue.
Anyway that is the background to my issue, and as you might expect I'm paranoid to even run the thing after 2 motors putting valves through the piston. My boat is a 2003 sea ray 176, serial# for the old motor is om628758.
My issue is when I am at around 3/4 throttle and I hit full throttle hard (push down fast) it does it hesitates for just a second, chokes and then goes.. I have posted a video to the issue, you can hear it best towards the end. If I bring the throttle up gradually it does not have the same problem. It will also sometimes do it from a say idle if you push down the throttle hard, but most of the time it's just a very slight hesitation.
Since the rebuild of my brand new motor this spring I have rebuilt the carb, (every single part but the float) checked, re-checked and triple checked it, taken the fuel line out and inspected it, replaced the fuel filter in the gas pump, pulled fuel from a separate gas tank, done a fuel pressure check at idel was 5psi. Yesterday I even bought a timing light to check the timing, used the timing shunt to put in base mode was 1 degree, and 24 degrees at 3000rpm (used a digital timing light)
At this point I'm just wondering if it is what it is, I am very paranoid about anything with this motor dont want a 3rd to go boom. Any suggestions or comments I'd love to hear. It starts up great, idle is better when it's cold seems to idle harder when warmed up, engine sounds very good when cruising it's just this one issue.
I think this might have something to do with the problem as well. 
