boardhauler
Contributing Member
Has anyone had an issue with a 25 or 30 HP 4 stroke that would not start?
I have a Mercury 30 HP EFI ELPT 2007. It is the same engine as the Tohatsu and Nissans.
I got it used. It ran OK for 2 times out on the water. The second trip it shut down and would not start.
I get no pop when trying to start it (electric start). The tach jumps up to 500-1000 rpms and drops quick to zero.
I checked spark and see it spark 2-3 cylinders then nothing.
I have been through everything that I can think of. Checking with factory manual (Mercury) which seems to list the incorrect Ohm values for almost everything.
Coils
entire fuel system (incl. repairing regulator that was stuck open, new filters, checked injectors and screens, HP pump, float and seat, etc.)
Fuel rail pressure is 40+ psi, solid.
IAC, IAtemp sensor
oil pressure switch
temperature sensor
fuse
wiring
plugs (new), old ones looked fine.
charge regulator
remote controls (they are new) & wiring
kill switch & entire circuit
battery (full charged)
I can see the number one cylinder exhaust port open and close when I rotate the engine by hand.
idle exhaust port (was plugged with mud dobber nest)
compression (reading 110 psi)
I replaced the pulser sensors and stator for fun, and after I tapped the ECU and it popped 2 times, then nothing, can not get it to repeat.
I think it is the ECU. I have been looking for a used one, and everyone says they are getting tons of calls for them.
I have a Mercury 30 HP EFI ELPT 2007. It is the same engine as the Tohatsu and Nissans.
I got it used. It ran OK for 2 times out on the water. The second trip it shut down and would not start.
I get no pop when trying to start it (electric start). The tach jumps up to 500-1000 rpms and drops quick to zero.
I checked spark and see it spark 2-3 cylinders then nothing.
I have been through everything that I can think of. Checking with factory manual (Mercury) which seems to list the incorrect Ohm values for almost everything.
Coils
entire fuel system (incl. repairing regulator that was stuck open, new filters, checked injectors and screens, HP pump, float and seat, etc.)
Fuel rail pressure is 40+ psi, solid.
IAC, IAtemp sensor
oil pressure switch
temperature sensor
fuse
wiring
plugs (new), old ones looked fine.
charge regulator
remote controls (they are new) & wiring
kill switch & entire circuit
battery (full charged)
I can see the number one cylinder exhaust port open and close when I rotate the engine by hand.
idle exhaust port (was plugged with mud dobber nest)
compression (reading 110 psi)
I replaced the pulser sensors and stator for fun, and after I tapped the ECU and it popped 2 times, then nothing, can not get it to repeat.
I think it is the ECU. I have been looking for a used one, and everyone says they are getting tons of calls for them.