Hi, I've read through endless postings and most of the data is related to analog gauges, but I understand the underlying troubleshooting may be the same.
Situation:
Just replaced a 6.2L MerCruiser on my 2007 Sea Ray 310 - only 130 hours on both motors, but the port engine scorched a piston after overheating when we sucked up something on the Potomac River. It was very sudden and the guardian system kicked in, but not quick enough to avoid the temps that basically seized a wrist pin. The engine ran, but had piston slap. Sorry, not really the issue, just explaining how we got here.
So, replaced the setup with a MerCruiser factory long block. Did some preventive maintenance and replaced the transom water pickup tube assembly with the new version, replaced the cool fuel 3 module and injectors (found paint in the module and MerCruiser replaced it under a customer care program), new plugs, new wires, new cap, new rotor, oil, etc. Initially I didn't pickup on it as I keep the motor at 3,000 RPMs and below for the first five to ten hours, but the tach would jump a bit on the port (nothing on the starboard) and I would feel a slight miss as we went higher in the RPM range. That prompted the fuel module and injector change, the mechanic suspected the injectors were bad and attempts to clean them ended up with just replacing them. Thought for sure that would address the issue but it hasn't. Mechanic says he swapped the ignition coil from the other motor and no change.
So I've personally checked every plug wire to ensure they are installed correctly and not just resting across other wires. Unplugged and rechecked every connection on the engine harness, honestly they all look pristine. The mechanic says his diagnostics show the engine is running fine and no codes are throwing.
I call to MerCruiser yields something about a "filter" in the vessel view setup that either accounts for or creates this variation. I don't buy it, and it wasn't an issue before. I think if anything the Vessel View is more sensitive to showing issues and there's something amiss (no pun intended).
So I intend to check the following after reading for weeks online:
1. Grounds to the block. Since this can easily get sloppy by moving parts over, perhaps it's that simple and some greasy hands or poor surface prep is in play.
2. Swap the ignition coil myself, I'm not sure that was really done as I believe the mechanic was betting solely on the fuel injectors as being the issue. He's a super great guy, but so busy that I think these issues can just overwhelm the business.
3. I cannot confirm if I have a hall effects sensor - parts catalog says it's not sold separately. If one is present, I will either test it or swap from the good engine.
4. Cam sensor - long shot, but perhaps it's dirty, either the connection or the sensor face.
5. Swap the vessel view plugs at the helm to display on the opposite side just to eliminate the wiring harness. I think this is long shot as well given it was working perfectly before.
I'm convinced it's something simple and related to the motor installation.
I welcome any advice in this troubleshooting process.
Video link to what it looks like:
https://1drv.ms/f/s!Apeu2tS2JTo2hup01kXpsyzcbKDX_g
Situation:
Just replaced a 6.2L MerCruiser on my 2007 Sea Ray 310 - only 130 hours on both motors, but the port engine scorched a piston after overheating when we sucked up something on the Potomac River. It was very sudden and the guardian system kicked in, but not quick enough to avoid the temps that basically seized a wrist pin. The engine ran, but had piston slap. Sorry, not really the issue, just explaining how we got here.
So, replaced the setup with a MerCruiser factory long block. Did some preventive maintenance and replaced the transom water pickup tube assembly with the new version, replaced the cool fuel 3 module and injectors (found paint in the module and MerCruiser replaced it under a customer care program), new plugs, new wires, new cap, new rotor, oil, etc. Initially I didn't pickup on it as I keep the motor at 3,000 RPMs and below for the first five to ten hours, but the tach would jump a bit on the port (nothing on the starboard) and I would feel a slight miss as we went higher in the RPM range. That prompted the fuel module and injector change, the mechanic suspected the injectors were bad and attempts to clean them ended up with just replacing them. Thought for sure that would address the issue but it hasn't. Mechanic says he swapped the ignition coil from the other motor and no change.
So I've personally checked every plug wire to ensure they are installed correctly and not just resting across other wires. Unplugged and rechecked every connection on the engine harness, honestly they all look pristine. The mechanic says his diagnostics show the engine is running fine and no codes are throwing.
I call to MerCruiser yields something about a "filter" in the vessel view setup that either accounts for or creates this variation. I don't buy it, and it wasn't an issue before. I think if anything the Vessel View is more sensitive to showing issues and there's something amiss (no pun intended).
So I intend to check the following after reading for weeks online:
1. Grounds to the block. Since this can easily get sloppy by moving parts over, perhaps it's that simple and some greasy hands or poor surface prep is in play.
2. Swap the ignition coil myself, I'm not sure that was really done as I believe the mechanic was betting solely on the fuel injectors as being the issue. He's a super great guy, but so busy that I think these issues can just overwhelm the business.
3. I cannot confirm if I have a hall effects sensor - parts catalog says it's not sold separately. If one is present, I will either test it or swap from the good engine.
4. Cam sensor - long shot, but perhaps it's dirty, either the connection or the sensor face.
5. Swap the vessel view plugs at the helm to display on the opposite side just to eliminate the wiring harness. I think this is long shot as well given it was working perfectly before.
I'm convinced it's something simple and related to the motor installation.
I welcome any advice in this troubleshooting process.
Video link to what it looks like:
https://1drv.ms/f/s!Apeu2tS2JTo2hup01kXpsyzcbKDX_g