Posted by Peter Florance on April 30, 2005 at 19:02:44 from 68.10.186.48
In Reply to: Throttle body vacuum port /stem -service only ? posted by Carl on April 30, 2005 at 18:38:58:
from the faq:
"In fact, the US 530i has only vacuum retard and the 80-81 US 528i has only vacuum advance. 79 US 528i appears to use both, possibly with a different distributor."
You might want to browse the entire throttle body faq while you're there