Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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HFM General Information

The hot film engine management - sequential multiport fuel injection/ignition system (HFM-SFI) is a further development of LH sequential multiport fuel injection system (LH-SFI) and the known distributor ignition system (formerly known as EZL)

HFM = Hot Film Engine Management
SFI = Sequential Multiport Fuel Injection

The engine control module (N3/4) for HFM-SFI incorporates the control of the fuel injection and ignition systems into one module.