Those cars have EDS (Electronic Diesel Something) also‎, so no vacuum signal 
means the computer needs reset, or no boost. 

  Original Message  
From: Kaleb C. Striplin via Mercedes
Sent: Tuesday, August 8, 2017 4:50 PM
To: Mercedes Discussion List
Reply To: Mercedes Discussion List
Cc: Kaleb C. Striplin
Subject: Re: [MBZ] Hard Shifting

There are dozens of vacuum lines on that car. Any one of them is probably 
become disconnected or had the rubber connector split or something. I had to 
replace a couple of connectors before Craig got it. It's probably got very 
little boost as well since a vacuum leak will cause the wastegate to not close. 

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