Weird one today, wondering what you guys think.
1998 5.7L EFI Alpha 750 hours
engine runs like a top, great compression measured last year (180-100) new distributor, cap, rotor, plugs, wires, and fuel pump. Has run perfect for 10 hours this year.
today I’m cruising along at 3300 rpm and it just quits. No warning signs at all, I have the fox marine gateways and they report no check engine light or reduced power, fuel pump kicks on, etc. Motor fired right back up but died again a minute later. 2 or 3 more starts and then it ran perfect again
went to anchor, sat for 3 hours, ran back flawlessly.
the only thing that seems a little off is the sync gauge is bouncing erratically like that engine is losing revs. The fox-marines do not show any drop in RPM, engines are solid and synced.
I also noticed the alternator on this motor is very hot to the touch and the idle voltage is only 13.1 while my other side is 14.1. I’m going to replace it since it’s old, but 13v shouldn’t cause the EFI to shut down.
We’re in the north and the air was only 75 degrees, shouldn’t be vapor lock. Checked both battery and alternator leads and everything is tight
if it happens again I think I need to get codes pulled. But what say you? Gotta be electrical right?
1998 5.7L EFI Alpha 750 hours
engine runs like a top, great compression measured last year (180-100) new distributor, cap, rotor, plugs, wires, and fuel pump. Has run perfect for 10 hours this year.
today I’m cruising along at 3300 rpm and it just quits. No warning signs at all, I have the fox marine gateways and they report no check engine light or reduced power, fuel pump kicks on, etc. Motor fired right back up but died again a minute later. 2 or 3 more starts and then it ran perfect again
went to anchor, sat for 3 hours, ran back flawlessly.
the only thing that seems a little off is the sync gauge is bouncing erratically like that engine is losing revs. The fox-marines do not show any drop in RPM, engines are solid and synced.
I also noticed the alternator on this motor is very hot to the touch and the idle voltage is only 13.1 while my other side is 14.1. I’m going to replace it since it’s old, but 13v shouldn’t cause the EFI to shut down.
We’re in the north and the air was only 75 degrees, shouldn’t be vapor lock. Checked both battery and alternator leads and everything is tight
if it happens again I think I need to get codes pulled. But what say you? Gotta be electrical right?