Anybody have any suggestions?
My 2004 Ebbtide 2400 Mystique, 24' deckboat with the 5.7 Gi runs rich. It smells rich and the back of the boat is covered in black soot every time I run it. It runs fairly smooth. I have spent quite a bit of money trying to get it fixed including finally buying the Diacom diagnostic software to try to figure it out myself. There are no codes. I thought I had it narrowed down to the fuel pressure regulator because the diagnostic instructions say the pressure should be 50 - 60 psi when the key is turned on but should drop 3 - 10 psi when it starts. The pressure is 50 psi when I turn the key on but it doesn't drop when the engine is started, in fact it goes up about 2 psi. I figured I had it solved but a new pressure regulator performed exactly the same ($200 down the drain!). I checked the vacuum, including pulling a vacuum on the regulator with a pump and it's within spec. The water temperature is on the lower end of spec, 155 F. The manifold air temperature and pressure seem correct, at least they start at ambient conditions and change accordingly as the engine warms up. The IAC valve was replaced by a boat shop but that didn't help. I have also pulled the injectors and checked them for leakage, they don't leak. I'm at a loss at this point. Any suggestions?
My 2004 Ebbtide 2400 Mystique, 24' deckboat with the 5.7 Gi runs rich. It smells rich and the back of the boat is covered in black soot every time I run it. It runs fairly smooth. I have spent quite a bit of money trying to get it fixed including finally buying the Diacom diagnostic software to try to figure it out myself. There are no codes. I thought I had it narrowed down to the fuel pressure regulator because the diagnostic instructions say the pressure should be 50 - 60 psi when the key is turned on but should drop 3 - 10 psi when it starts. The pressure is 50 psi when I turn the key on but it doesn't drop when the engine is started, in fact it goes up about 2 psi. I figured I had it solved but a new pressure regulator performed exactly the same ($200 down the drain!). I checked the vacuum, including pulling a vacuum on the regulator with a pump and it's within spec. The water temperature is on the lower end of spec, 155 F. The manifold air temperature and pressure seem correct, at least they start at ambient conditions and change accordingly as the engine warms up. The IAC valve was replaced by a boat shop but that didn't help. I have also pulled the injectors and checked them for leakage, they don't leak. I'm at a loss at this point. Any suggestions?
