86 tower of power 115 missing at wot

[boydog]

115 on my bass boat with a 4" jack plate
purrs at wot until i start to trim it up, then she starts to miss/sputter, can trim it back down a little and she purrs again
fuel delivery when trimmed high?
these old mercs will only trim so high, so im not over trimming/over riding the trim
thoughts?

 

[Chris1956]

It shouldn't do that. Disconnect your mercury switch (if you have one) and see if that fixes it. If not, look for a ign killer wire being pinched and grounded as you trim. Check the stator and trigger wires for the same thing.

 

[Chris1956]

Maybe the fuel line is being pinched as you trim?

 

[boydog]

thanks guys will check wiring

 

[jimmbo]

An 86 can trim very high, high enough to enough to starve the engine of water, even without a jack plate, so beware.

Does this happen at any speed/rpm, or only WOT? Does it quit when you quit trimming up, or only after you trim in?