yellit, I know from personal experience that the EZL for a 1991 300CE cannot be reconditioned due to epoxy covering the internal components. Contact Beckmann Technologies if you want to confirm that fact.

After a futile search for a used EZL I ended up buying a new one from our local MB dealer for around $1,800 (wholesale price). If you go that route advise the Parts Department to search under EZL's for a 1990 300SL because their system will say the 300CE EZL is backordered (at least that was the case when I searched for one about 5 years ago).

Routine maintenance of the ignition system (distributor cap, distributor rotor, spark plugs and ignition wires) will prevent EZL failure. I know that's not what you wanted to hear, but those are the facts I learned from the same situation as yours.

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Fred Hoelzle