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You need to get to the vacuum switch over valve & check each vacuum element...
Did you check the vacuum line that goes toward the right side of the car from that check valve under the hood. There is a vacuum storage tank under the right fender inner liner. THE vacuum line goes RIGHT by the battery & many times battery acid fumes EAT the plastic vacuum lines.
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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