I have 1989 boat with 5.7 260 hp V8 merc ThunderboltIV ignigtion alpha 1 drive
The engine was rebuilt 100hours ago. Runs great for about 1 hour then lost power, can drive at idle for a while then the volt meter starts jumping and motor stops. Will start right back up but can't go faster than idle without powerloss misfire, If let cool for an hour will run fine.
Tried fuel filter, new rotor & cap begining of season, Replaced ignition coil and wire. Side note temp gauge was jumping now pinned full hot thought it was the gauge, tested it yesterday and its fine, bad sensor?? I don't think the two problems are related because the engine is raw water cooled. Looking for ideas. Thank you
The engine was rebuilt 100hours ago. Runs great for about 1 hour then lost power, can drive at idle for a while then the volt meter starts jumping and motor stops. Will start right back up but can't go faster than idle without powerloss misfire, If let cool for an hour will run fine.
Tried fuel filter, new rotor & cap begining of season, Replaced ignition coil and wire. Side note temp gauge was jumping now pinned full hot thought it was the gauge, tested it yesterday and its fine, bad sensor?? I don't think the two problems are related because the engine is raw water cooled. Looking for ideas. Thank you
