Mark V
Member
I have a 2006 240 Sundancer with the 350 MAG MPI/Bravo III. It has 800 hours on it and it has never died or failed to start until now. I am the original owner.
While running fine on plane for 5 minutes, about 4000 rpm, it just died like you turned off the key. No Smartcraft beeps or fault message on the display when it died. Now It will not start. Starter cranks it OK, but it will not start, on rare occasion a single back-fire happens (boat is now on trailer, backfire seems to be out the exhaust, not out the throttle body).
A long list of troubleshooting has been done, no smoking gun. Smartcraft seems to be working as it beeps and displays fault messags as I disconnect sensors, etc during troubleshooting. Currenty focused on the ignition coil. Would like to rule it in or out before moving on.
The first day I did 2 quickie visual ignition tests: one holding the distributor High Voltage cable near ground while cranking the engine, and then with a spark plug grounded to engine. Both times sparks jumped as expected, but they did not look robust; kinda yellow, with some blue.
It's a lot to ask, but if someone has an ohm meter and a known good coil like mine, please take a look at the pdf I attached, and check resistances as I did and compare readings to mine. My local Mercruiser parts place does not have a new or used one to compare. Unfortunately, Mercruiser Tech Support does not have any check out values for this coil. Obviously ohm values on a coil are not a tell-all test, but they still may be helpful.
-Thanks in advance!
While running fine on plane for 5 minutes, about 4000 rpm, it just died like you turned off the key. No Smartcraft beeps or fault message on the display when it died. Now It will not start. Starter cranks it OK, but it will not start, on rare occasion a single back-fire happens (boat is now on trailer, backfire seems to be out the exhaust, not out the throttle body).
A long list of troubleshooting has been done, no smoking gun. Smartcraft seems to be working as it beeps and displays fault messags as I disconnect sensors, etc during troubleshooting. Currenty focused on the ignition coil. Would like to rule it in or out before moving on.
The first day I did 2 quickie visual ignition tests: one holding the distributor High Voltage cable near ground while cranking the engine, and then with a spark plug grounded to engine. Both times sparks jumped as expected, but they did not look robust; kinda yellow, with some blue.
It's a lot to ask, but if someone has an ohm meter and a known good coil like mine, please take a look at the pdf I attached, and check resistances as I did and compare readings to mine. My local Mercruiser parts place does not have a new or used one to compare. Unfortunately, Mercruiser Tech Support does not have any check out values for this coil. Obviously ohm values on a coil are not a tell-all test, but they still may be helpful.
-Thanks in advance!