Re: 45HP Mercury???
I have a 45HP Mercury that will not throttle up all the way and is missing bad. I have replaced the spark plugs cleaned the fuel system( carb and things like that) and I cant figure out what the problem is.
Do a search on this forum for "switchbox". You can see whether the symptoms you describe match what other folks have experienced. I had the same problems you have with an '87 Mercury 45. Check out the thread at
http://forums.iboats.com/showthread.php?t=241903 My issues were laid to rest -- yesterday -- with a new switchbox delivered to my door for $159.
Probably the most helpful post on the issue came from J. Martin who wrote:
"Generally speaking, if the stator is bad, all cylinders will be affected, except on a 6, where half will be affected. If a trigger is bad, 2 opposite cylinders (in the timing sequence) will be affected. Switchbox is a crap shoot. Coil affects only one cylinder. You've eliminated the coil with a swap procedure, so that leaves the switchbox as the most likely culprit."
Succinct, accurate and immensely helpful.
