Hi Jim

Not sure about the actual problem BUT the EURO SL107 was not actually designed for a CAT and Lambda sensor set up . These were only put in when imported - I've read posts where US SL owners have "restored" their EURO models to "pre-import" state. I know that comparing the performace data between US modified 300SL and and my UK model it looks to be a "no-brainer" to put it back to original standard if you can get away with it in your particular State so I guess with the 280 it would give even more advantage.

Cheers

Another Jim

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Keep your Motor runnin'

Jim's '88 300SL