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I suggest obtaining the Factory manuals, available from either MBUSA or a variety of other vendors on computer CD. You can also find them in the out-of-print books on places such as Ebay. The Electrical Troubleshooting Manual (ETM) has the complete vacuum circuit diagrams, and should help you. It helped me identify why I wasn't getting turbo boost in my '86 300SDL. Turns out, all I needed to do was to switch vacuum lines at the switchover valve. That alone was worth the $130 I paid for the CD!
Just my 2¢ worth.
- Casey
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Casey Cooper
"From a long line of Mercedes ownership"
'86 300SDL 250K miles (Gone, but not forgotten); best diesel I have ever driven, too bad about the Achilles heel.
'81 240D 370K miles (Sold to my brother after 9 years and 150K miles of reliable driving!)
[Five other Mercedes in family clipped for less length.]
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