New for 2003 and Beyond 2003

IAFM MPFI Models

4.3 GXi5.0 GXi5.7 GXi

The acronym (first used in 2003) IAFM stands for a new multi port fuel injection system called Integrated Air Fuel Module. This is a combination of intake manifold, throttle body, and injectors. This setup changes these engines from TBI to MPI type engines.

With this new system, Volvo Penta has increased the power outputof our marine gasoline engines up to 20 more HP. With power ratings of up to 320 HP, the upgraded engines become faster and more reliable.

In Fall of 2001 Volvo Penta stopped producing throttle body injected gasoline engines. For 2005 we offer carbureted and Multi-port Fuel Injected (MFI) engines.

In carbureted engines, Volvo Penta offers the 3.0GL, 4.3GL, 5.0GL and the 5.7GL

In the IAFM multi port configuration, Volvo Penta offers the sixcylinder 4.3L, the V8 small block 5.0L, and the 5.7L.

The big block 8.1L is again offered as MPFI, although it is not of IAFM configuration. For 05, the 8.1L uses a returnless fuel system. There is only one fuel line to the fuel rail and the pressure regulator has been moved from the fuel rail to the fuelpump module.

Changes for 2004

Efi Engines

New exhaust bellows to reduce noise and vibration on the 5.0, 5.7 and 8.1L engines.

New 8.1L oil cooler

New emissions calibrations

A second knock sensor on the 4.3Gxi, 5.0Gxi, 5.7Gi and the 5.7Gxi

New ECM anti-knock strategy for all EFI engines

EVC (Electronic Vessel Control) compatible harnesses for all EFI engines

New ECM for all engines: MEFI 4b Same functionality, just new hardware

Carbureted Engines

New Tyco electrical supply box with new engine harnesses

New emissions calibrations

There were very few changes for the 2005 model year. The changesare noted above.