I have a 250 inboard motor.. and it keep stalling?

Question

I HAVE A BOAT . I CAN CRANK IT UP .. STARTS BUT WHEN I GO TO IDLE IT UP .. IT GOES OUT . I WENT TO MARINE AND THEY SAID IT MIGHT BE THE INTERRUPT SWITCH . WHAT HAPPEN WAS .. HAD IT IN WATER AND HIT A SAND DUNE AND IT STOPPED WORKIN . I NEED TO KNOW HOW I GO ABOUT ATTEMPTINT TO FIX THE INTERRUPT AND WHAT IT LOOK LIKE . I KNOW ON THE THROTTLE I FOLLOWED 2 BLK WIRES DOWN TO CONNECTOR .. NOW WHAT DO I DO .. WHICH ONE ?.. I WOULD APPRECIATE IT IF I CAN GET A LIL HELP... TY

Answer 1

The sand dune you hit would not cause the problem you are having.I suspect your problem is the adjustment of your interrupter switch if this is what is making it stall when you are trying to throttle up.First lets check to see if the switch is working.The switch is located on the plate on the engine where your 2 cables meet.One coming from the out-drive.The other from the control box.With the engine running in neutral,

activate the switch with your finger to see if the engine stalls.If

it does it is working.To check to see if it is out of adjustment,

with the engine off move your control handle to full throttle.Now

at the back check to see if the switch is activated.If yes then it

is out of place and needs to be adjusted.If the switch is not activated then it is not your switch that is causing your problem.You have a carb/fuel problem.Check your switch first

and if this is not your problem,post another question.Hope this helps and good luck.

Answer 2

The interrupt switch was an attempt to make the mercruiser gear set engage without the usual clatter and wear of a fixed tooth clutch. It is on the shift adjust plate on top of the bell housing. The short cable from the sterndrive meets the control box cable there. It kills the engine for just a second as the gears are engaged.  It really shouldn't be moving if you are just running up the neutral throttle. You can test it by connecting the two wires together-taking the switch out of the circut.  The "hit the sandbar " shouldn't have caused any problem with the interrupt. I would check the lower and make sure it rotates smoothly and shifts and catches in each direction.  A bad lower will kill the motor when you try to engage a locked up unit. Did you drive it home after the sand bar incident?