For over a year now my port motor has been failing. It is extremely sporadic ? it can happen after just simply sitting for days (no start). It has happened while underway (4200 RPM?s) and a stall followed by no start. I have (along with certified Penta Mechanics ) have tried numerous things ? but one thing that seems to resolve is a new coil which will give me approximately 5-10 hours of clean starts and running. So obviously we have been chasing ignition. However, the other day when the engine failed I was able to see spark through a spark tester on the front right cylinder, had 50 lbs of fuel pressure at the fuel injector rails and confirmed the injectors were requesting fuel via a test light and no start. Then after sitting for 2 hours it started ? however other time it runs fine sits for 2 hours and wont start. Here is what has been done to date:
Swap ECM ? no change
New Plugs
New wires
New battery
Numerous coils
Cleaned and greased grounds (to the best of my abilities)
Added a separate ground to the coil itself
Confirmed alternator output voltage (14 same as starboard)
Confirmed Fuel pressure (50 lbs ? same as starboard)
Changed fuel filters (many times)
Poured fuel into glass to confirm no water
Confirmed compression on all cylinders
Confirmed plugs were dry
As of now it is a complete crap shoot as to if it will start and if so how long will it run.
Any help is appreciated.
Swap ECM ? no change
New Plugs
New wires
New battery
Numerous coils
Cleaned and greased grounds (to the best of my abilities)
Added a separate ground to the coil itself
Confirmed alternator output voltage (14 same as starboard)
Confirmed Fuel pressure (50 lbs ? same as starboard)
Changed fuel filters (many times)
Poured fuel into glass to confirm no water
Confirmed compression on all cylinders
Confirmed plugs were dry
As of now it is a complete crap shoot as to if it will start and if so how long will it run.
Any help is appreciated.