bio350, suggest you contact Beckmann Technologies and ask if they can rebuild the EZL (ignition control unit) for a 1992 S320.

When I contacted them about an EZL for a 1991 300CE their rep informed me that the internals are covered with epoxy making it impossible for them to identify the components. Therefore they are unable to rebuild that particular EZL. After an exhaustive search for a used EZL I reluctantly bought a new one from our local MB dealer for around $1,700 (wholesale price due to a favor by the dealership owner). FWIW ... a new EZL comes with the heat-conducting paste on the back.

A local indie advised me that routine maintenance of the ignition components (distributor cap, distributor rotor, spark plugs and ignition wires) in our 1991 300CE will prevent failure of the EZL.

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Fred Hoelzle