hottoddie
Well-Known Member
- Jan 11, 2012
- 2,231
- Boat Info
- 1986 Sea Ray 390 EC
Garmin 4212 Chartplotter
Garmin 24 HD Radar
Garmin 546s Plotter
- Engines
- 454 Crusaders
Lots of good info there, but Before you get too deep into this, I would swap all 8 coils from one motor to the other. Label them with a sharpie or paint pen to keep things organized.
See if the popping moves to the other motor.
Also closely inspect the wire harness connectors that go to the coils, look for damaged, corroded, or loose crimps.
Instead of removing all 8 coils from the other motor why not just remove 1 and replace one coil at a time to see the misfire goes away. If it does you know which coils is bad. If it doesn't go away then you only have one coil to reinstall back on the other motor. BTW use dialectric grease on the connections.