bubba_tiger
07-18-2018, 07:23 AM
I have a 2004 Mobius LSV, and this is the first season I have had it on the water. The Indmar engine is EFI (throttle body injection). I believe it is running rich because it seems to act flooded when after it is turned off and then started again (switching skiers and such). I've also noticed a black build-up on the back of the boat.
I've searched the threads and found the following (https://forum.moomba.com/showthread.php?8977-EFI-Rich-fuel-mixture) from Larry Engelbert, Indmar Marine Engines, "Power to the Sport":
The three most likely causes of a rich running EFI engine are:
1. A faulty coolant temp sensor that is telling the ECM that the engine is cold when it is hot.
2. A MAP (Manifold Air Pressure) sensor that is telling the ECM that the manifold pressure in the engine is high when it is low.
3. High fuel pressure caused by a faulty fuel pressure regulator or by a restricted fuel return line.
My problem is that I do not know where these sensors are located. I plan on pulling the plugs to see what they look like, but I believe they were black when I pulled them to winterize the boat after we bought the boat. Any help would be appreciated!!! Thanks
I've searched the threads and found the following (https://forum.moomba.com/showthread.php?8977-EFI-Rich-fuel-mixture) from Larry Engelbert, Indmar Marine Engines, "Power to the Sport":
The three most likely causes of a rich running EFI engine are:
1. A faulty coolant temp sensor that is telling the ECM that the engine is cold when it is hot.
2. A MAP (Manifold Air Pressure) sensor that is telling the ECM that the manifold pressure in the engine is high when it is low.
3. High fuel pressure caused by a faulty fuel pressure regulator or by a restricted fuel return line.
My problem is that I do not know where these sensors are located. I plan on pulling the plugs to see what they look like, but I believe they were black when I pulled them to winterize the boat after we bought the boat. Any help would be appreciated!!! Thanks