MEFI Information
This is Crusader's document for MEFI engines. Both Mercury and Crusader used GM's MEFI system as it came from GM, so much of this Crusader manual applies for Mercury engines, too. Other companies, such as Volvo and Pleasurecraft, etc. also used the same GM system. This document would apply to all of those system.
One bit of erroneous information that is floating around the Internet. Many say that "MerCruiser used a Ford Idle Air Control (IAC) on the marine engines." This is untrue. As this document shows, the IAC used is the one GM installed at their factory.