You probably have a vacuum leak somewhere. The turbo is vacuum operated on 
these rather than pressure. Low vacuum equals no boost. 

Sent from my iPhone

> On Mar 3, 2020, at 11:23 PM, Curley McLain via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> Got it aligned today.   Will pick it up in the morning, and it goes 
> immediately into service.   Running out to the alignment place, it did not 
> appear that the turbo was working, or at least it was lazy.  I will blow out 
> the line to the intake manifold.
> 
> What other things should I check?   OVP relay?
> 
> It is a 91, and think I heard that you can't block off the EGR on these 
> without causing a digital fit with some black box.  I forgot if there is a 
> way to check EGR because I always blocked it (easy) or took it off (Best)  It 
> has a nest of vacuum pods on top of the EGR, and I have not investigated any 
> of these yet.
> 
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