Darwaypen
Cadet
- Joined
- Apr 7, 2019
- Messages
- 16
hello, new poster here.
I have recently purchased a 2004 5.0 MPI Monterey. On first time out it ran smooth but seemed lacking on power. I am a pretty good auto mechanic so I performed a tune up on the old 305. Plugs, rotor, cap, wires changed fuel separator, even changed the coil and module assembly. Took boat back out, ran great, until I ran full out for about an hour, then it suddenly dropped about 1000 rpms and ran like it did previous to the tune up, lacking power. idle remains very smooth, acceleration is very smooth, just lacked power. After putting around for about 15-20 minutes I took off and all was good again for about 20 minutes at wide open, then the sudden drop again. I have now looked in the fuel tank, it is very clean, checked the anti siphon valve, it is not stuck and appears to be working fine. any suggestions would be much appreciated. thanks
I have recently purchased a 2004 5.0 MPI Monterey. On first time out it ran smooth but seemed lacking on power. I am a pretty good auto mechanic so I performed a tune up on the old 305. Plugs, rotor, cap, wires changed fuel separator, even changed the coil and module assembly. Took boat back out, ran great, until I ran full out for about an hour, then it suddenly dropped about 1000 rpms and ran like it did previous to the tune up, lacking power. idle remains very smooth, acceleration is very smooth, just lacked power. After putting around for about 15-20 minutes I took off and all was good again for about 20 minutes at wide open, then the sudden drop again. I have now looked in the fuel tank, it is very clean, checked the anti siphon valve, it is not stuck and appears to be working fine. any suggestions would be much appreciated. thanks