Magneti Marelli Tuning Issues
When tuning our product on Harley Davidson motorcycles with Magneti Marelli EFI system, the dual throat EFI used from 1995 to 2001, there is a possibility of coming across mechanical and/or sensor issues. These pre-existing issues can confuse the tuning procedure and prevent you from achieving the best results.
If our base settings seem way off, or if following our basic adjustment sequence (#4) does not react as we suggest and result in a smoother fast idle, then you should look into the following;
Another common problem we see is a failed cylinder head temp sensor. The problems arising from this sensor failure are erratic driveability, the problem is there one day but not the next, etc. Also erratic backfiring and inconsistent fuel economy, are signs of this sensor failing.