115hp mercury mariner tower of problems

[jeremy1234]

I'm a newby so bare with me please i have a problem with the motor. starts and runs at low rpm fine,but try to accel and it wants to die and just falls on its face , prime the bulbs and helps it along a little. put sea foam in tank and sprayed carb cleaner in carbs but no help. it is an early to mid 80's six cylinder I think.** serial #6527523


also I dont have any idea what the part is but has gas line from top carb to it and has gas line from it to the middle carb with one yellow and one black wire the last trip out last season the fuel line from the top carb broke and i just replaced it thinking it would fix the problem took it out the first time this year and had this problem could that piece breaking cause the fuel line to break and that piece be my prob? sorry for the long post I hope somebody can help

 

[achris]

Re: 115hp mercury mariner tower of problems

I'm a newby so bare with me please i have a problem with the motor. starts and runs at low rpm fine,but try to accel and it wants to die and just falls on its face , prime the bulbs and helps it along a little. put sea foam in tank and sprayed carb cleaner in carbs but no help. it is an early to mid 80's six cylinder I think.** serial #6527523

Sounds like the carbs are set a little too lean. As a quick test, the next time it does it, just press the choke button for a second.... If the engine picks up, then open the carb mixture screws (one on each carb) 1/8 to 1/4 turn.

also I dont have any idea what the part is but has gas line from top carb to it and has gas line from it to the middle carb with one yellow and one black wire the last trip out last season the fuel line from the top carb broke and i just replaced it thinking it would fix the problem took it out the first time this year and had this problem could that piece breaking cause the fuel line to break and that piece be my prob? sorry for the long post I hope somebody can help

That part is the 'enricher', very similar to a choke... If you replaced the broken fuel line, it's unlikely to be the current problem.

Has the problem started since the line broke?

Chris.......

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

Yes the problem started after the broken fuel line. ran perfect before that but the broken line was the last trip out last season and the first trip out this year was this problem. Thanks for the help and anymore would be greatly appreciated

 

[achris]

Re: 115hp mercury mariner tower of problems

Try the choke thing... it may just be coincidence...

Chris.....

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

Thanks I will try with fingers crossed Thanks again chris

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

Hey chris is there any way to bypass the enricher to see if thats the problem?

 

[achris]

Re: 115hp mercury mariner tower of problems

Hey chris is there any way to bypass the enricher to see if thats the problem?

If you want to, just clamp the hoses....

Worth checking that you don't have an air leak on any of those hoses either...

Chris.......

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

Thanks again will try tomm and let you know

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

Tried the choke but with no success also tried to clamp the enricher with no success put in a temp fuel tank to check for old gas this also didnt help anybody with other suggestions it would be greatly appreciated.

 

[achris]

Re: 115hp mercury mariner tower of problems

Check that the timing is advancing correctly. You could have a frozen pivot point somewhere.

Chris......

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

Ok here is the update sorry it took so long i found out i didnt have spark in 135 so i replaced the switch box cause i had an extra laying around so i insatalled it put the spark plug tester on 3 and it sparked once and that was it, so i then tried 1 and 5 and they spark like no tommorro, so i swapped coils to see. and nothing still dead on 3 so i checked all connections swapped plugs and still nothing in 3 will a switch box lose just one plug or does anybody have another suggestion? any help please

 

[achris]

Re: 115hp mercury mariner tower of problems

... will a switch box lose just one plug ...

Yep, they can...

 

[jeremy1234]

Re: 115hp mercury mariner tower of problems

does the trigger or stator have anything to do with it you think or just a bad switchbox? thanks for the help chris

 

[achris]

Re: 115hp mercury mariner tower of problems

does the trigger or stator have anything to do with it you think or just a bad switchbox? thanks for the help chris

At this stage I think it's probably just the switchbox.... If it was a trigger, you'd lose 2 sparks, one from each switchbox. If it was the stator you'd lose all sparks on one of other, or both, switchboxes.

There is a possibility that the coil associated with the lost spark could have killed that circuit in the switchbox. I would replace that coil too, they're not expensive.

Chris..........