I have been having an issue with running rich at idle and low engine vacuum on a remanufactured engine. Extensive testing done by several mechanics Mercury certified leading consensus is that the cam may be out a tooth. I am have difficulty with this as the engine runs fine from 1K to 4.3K...
1999 7.4 MPI New long block from Michigan Motorz. Engine runs rough at idle. Only have 10" of vacuum. When hot if you rev to > 2k and pull back to idle it will stall. You have to restart by opening throttle 3/4 or more. When cold it does not stall. Engine does not stall at any other time...
From a previous thread I have a 1999 7.4 MPI. I replaced the engine with Reman long block from Michigan Motorz. Since the install the engine is running very rich at idle. At all other speeds it appears to be running normally. We have tested and tried everything possible. Leaving only...
In a bind. From previous post my new long block was running rich. After testing replacing every component possible finially sent the ECM back to Mercury to get it reflashed. Well it will not accept the flash upgrade so it is coming back the same as it was.
My question does anyone know of...
I have a 1999 7.4 MPI
Had engine replaced ( Michigan Motorz Reman long block ) by a Mercrury Mechanic. Change out went well however engine now runs very rich. So much so they will not release the boat to me for fear of engine damage. When they rev the engine and bring it back to idle it...
