electrical problems-engine runs great-then dies

[ubobilean]

its a 92 150hp evinrude, this boat is ate up.... i take it out one day and its fine nothing happens all day running up and down the lake turning it on and off, fishing for about 8 hours.... then the next weekend comes i want to take a friend out on my boat to fish. i put the boat in start it up and warms up fine, then we get all situated in the boat and take off down the lake average wot 55 with 2 people on the boat, and then out of nowhere it shuts off like someone turned the key off. so i put it in neutral and try to start it up and it fires right up. then i go to take off and it runs fine. and then it does it again. i checked the primer bulb and replaced fuel lines, new battery, vro-and oil tank, new waterpump, temp sensors. and i dont have a clue why it shuts off and starts right back up can anyone help please....................

 

[tashasdaddy]

Re: electrical problems-engine runs great-then dies

do you have a kill switch lanyard, sounds like the kill switch or wire is shorting out. check all the black/yellow wires for any skint places.

 

[clemsonfor]

Re: electrical problems-engine runs great-then dies

i would agree on the kill switch, check the wires in the wire harness on the motor it self going into the power pack and not just the switch! i had a similar problem.

-NAte

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

i checked the black and yellow wires to the tether kill switch and to the neutral safty switch and to the power pack and i didnt find any skined areas and or loose conections and i tested the tether switch it worked and the neutral safty switch worked to any other sugestoins.......what else would cause it to shut off like that and start right back up like nothing was wrong... i also checked the ignition switch conections and they were good to..... could it be the power pack i dont want it to be.... i was always tought to k.i.s.s.(keep it simple stupid)

 

[jtexas]

Re: electrical problems-engine runs great-then dies

shift interrupt switch? not sure if it exists on the '92 - if it does it'll be a little switch over by the shift rod, port side, it's supposed to only shut off one bank of cylinders just when shifting, not sure it would shut her down completely.........

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

i checked that shift switch too... and it works properly......i wish it wasnt so intermitent and what ever is wrong with it to just to go out completly so i can find and fix it...well i went through all the black and yellow wires and i seen nothing wrong with them and tested them to see if i could get it to ground out... 2 hours worth of nothing but sweating lol... anymore suggestions on what it could be please feel free to let me know

 

[HighTrim]

Re: electrical problems-engine runs great-then dies

try it at night, the darkness will help to see arcing if any, i agree that it is a wiring issue on the kill switch or other.

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

ok i ruled out the kill switch checked and used a different wire and different kill switch and still the same result so........ im thinking its the ingnition switch which i just replaced or the power pack unless there are any other ideas out there that might help me diagnois my problem..... how could i test the power pack to see if there is something wrong with it...

 

[HighTrim]

Re: electrical problems-engine runs great-then dies

Check the DVA output on the orange wires from the power pack while connected to the ignition coils. You should have a reading of at least 150V or more. If the reading is low on one cylinder, disconnect the orange wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack. Im not so sure though that the PP is your problem. You can also test the PP in another way with an ohmmeter to test the diodes.

 

[jtexas]

Re: electrical problems-engine runs great-then dies

ok i ruled out the kill switch checked and used a different wire and different kill switch and still the same result so........ im thinking its the ingnition switch which i just replaced or the power pack unless there are any other ideas out there that might help me diagnois my problem..... how could i test the power pack to see if there is something wrong with it...

What different wire did you use?

You may have ruled out the kill switch itself, but not the kill circuit - if the black/yellow wire has an accidental intermittent contact with ground anywhere on its length, nothing else you do will have any effect. Actually, to rule out the kill switch, just take it out completely and tape up the wires.

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

i used a wire and did away with the with the kill circuit by routing a wire from the ingnition switch to the power pack and still got the same result so that ruled out the kill switch and wires. i have been working on this thing for about a year and i havent been able to find what it is and mechanics around here say to check the primer bulb they are so full of it... i took it out again and this time it shut off for a split second and before i could pull the throttle back it took off again which jerked and about made me have to change my boxers.. any way where do i go now......thanks for all the helpful tips

 

[rolmops]

Re: electrical problems-engine runs great-then dies

Try it with your keep it simple stupid ideas.Check the battery for a bad ground.

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

ok i did the keep it simple simple stupid i had already got a new battery cables nice and snug on battery and starter. i went to take the boat out so i could try diagnoisis it on the water when its doing it but this time i backed it in the water and lowered the motor and checked the primer bulb and tried to start it and it would turn over and nothing else would happen, tried to start it again nothing, the third time it fired and quit. so i sat there messing with it for a half an hour or more checking wires trying to start it and no luck. so i took it back to my parents house and hooked it up to the hose and checked to see if i could get it to start and see if there was any spark. well it didnt start and the spark was like(-= spark) - - -............ - - - on number one cylinder. its supose to fire rapidly and not intermitant like that.. right(i know it has 5 other plugs to hit and i am taking that into consideration) so i went to try to start it again and it fired right up ran like crap for a sec then ran like a champ. then i turned it off and on about 10 times worked fine. so i decided to go back the next day and see if it did it again or if it would start needless to say it didnt start.. does this help you to help me diagnois my problem

 

[HighTrim]

Re: electrical problems-engine runs great-then dies

1. Check the trigger resistance and DVA output as given below:

Wire Color : Check to Wire Color: Resistance: DVA Reading

White wire: Purple : 35-55: 0.6V or more Connected
White wire: Blue wire: 35-55: 0.6V or more Connected
White wire: Green wire: 35-55: 0.6V or more Connected
White wire: Pink : 35-55: 0.6V or more Connected

2. Disconnect the white/black temperature wire and retest. If all cylinders now fire, replace the timer base.
3. Check the DVA output on the orange wires from the power pack while connected to the ignition coils. You should have a reading of at least 150V or more. If the reading is low on one cylinder, disconnect the orange wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack.

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

hello im back i put a new powerpak on the boat.. took to a mechanic and he tested the boat out and came to same conclusion and said it ran fine now.. when i got it back i took it for a spin and it ran good.... so i got it ready for storage and this year i went to take it out to go fishing me and a buddy and it ran fine to our fishing spot about 7 min from boat ramp. fished for fourty five min and trolling motor quit so i went to start up the motor and it acted like it wasnt running on all cylinders....poping and jerking.. i kept tryin to mess with the primer bulb and wires... but didnt work a few minutes later i tried giving it some throttle to see if it would rev up. it did rev up for a couple of seconds then cut out like loss of fuel but i dont know if it is that or something to do with the powerpak going bad again or something totally new
please help this boat has been a pain in the you know what

 

[jtexas]

Re: electrical problems-engine runs great-then dies

spark test.

if spark is good then rebuild carbs.

 

[ubobilean]

Re: electrical problems-engine runs great-then dies

well i found out the problem the flywheel magnets where almost all damaged a hole in one and the rest had pieces around the edges broken off like something came apart in it and got caught between the flywheel and stator.... found a guy selling both used for 63 dollars but it has a grey sleeve and i dont know if that makes a difference or not i bought it..... the original has a black and the new powerpak has blue sleeve with these work together....