Thanks, RTH, I remember your previous post and, well, sort of disregarded it because of your mention of the intake manifold as source of vacuum...this is a diesel discussion, remember?

My servo was definitely bad--cracked body and frozen motor. Yes, I know about the vacuum switch on the bottom of the servo and I have vacuum there, just not very strong. I am in the process of deciphering the vacuum test procedures from the CD manual.

I also learned that there is an in-line fuse for the ACC amp, located in the fuse box. I wondered what that fuse was for!

Thanks again for your insight and I'll let you know what I discover.

-=-=-=Eddie

__________________
1978 300SD 149K miles silver-blue "Maxine" (mine!)
1979 300SD 318K miles red "Helga" (SOLD)
1980 300SD 321K miles yellow "Linda" (younger daughter's)
1980 300SD 148K miles blue (SOLD)
1980 300SD 153K miles green(parts car, SOLD)
Yes, I have a W116 fetish :-)