Hifirush
Member
- Mar 21, 2014
- 542
- Boat Info
- 1998 330 DA, 7.4 MPI with V-Drives, raw water cooled, Westerbeke
- Engines
- twin 7.4 MPI’s with V-Drives
I need some help from some of the engines gurus! My port 7.4 MPI (EFI) won't go over 3000 rpm. When throttling up, it runs slowly to 3200, then you can feel it skip and drop to 3000 and stay there. This has been an intermittent issue, but now it's here to stay.
Plugs, cap, wires and rotor are 9 months old, and in good shape. Compression is in the 145-150 range. Fuel filter has been changed recently with nothing nasty in the old one.
Unfortunately, getting a Mercruiser mechanic to the boat is about a 6 week wait, so I'm trying to fix this. I don't have access to the computer readers many people have.
I just replaced the MAP sensor but no joy. I had this left over from a rebuild so it was an easy "try".
It seems to retard itself. No loss of oil pressure, temps are good, isles perfectly. It's doesn't have that "good power" once over 1800 RPM throttling up, and then wham3200, skip and drop to 3000.
Any thoughts? Please!?!
Thanks, Matt
Sent from my iPhone using Tapatalk
Plugs, cap, wires and rotor are 9 months old, and in good shape. Compression is in the 145-150 range. Fuel filter has been changed recently with nothing nasty in the old one.
Unfortunately, getting a Mercruiser mechanic to the boat is about a 6 week wait, so I'm trying to fix this. I don't have access to the computer readers many people have.
I just replaced the MAP sensor but no joy. I had this left over from a rebuild so it was an easy "try".
It seems to retard itself. No loss of oil pressure, temps are good, isles perfectly. It's doesn't have that "good power" once over 1800 RPM throttling up, and then wham3200, skip and drop to 3000.
Any thoughts? Please!?!
Thanks, Matt
Sent from my iPhone using Tapatalk