Sounds like the type of frequency valve added to the control pressure circuit for lambda control on a grey market conversion.
Most of the ones I see are just going along for the ride (the electrical is disconnected). Not sure how one end coud be disconnected but I suppose the injector would plug it from the return. I'd get rid of it.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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