I wasn't aware there was anything vaccum-related under the injector cover. The EGR stuff is all by the air filter box and my guess is either you didn't reconnect your hoses right or one of the pressure converters has failed.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL