Posted by Mike W. on December 16, 2004 at 13:11:07 from 152.163.100.72
In Reply to: Thermo Valve. . .? what does it do. . posted by Jaime Obando on December 16, 2004 at 12:07:38:
If you are talking about the green one on 528i's, it is a smog device, but a pretty painless one. It doesn't allow vacuum to the advance side of the distributor until the car is warmed up somewhat. I tried bypassing it one time for troubleshooting and it didn't really make any difference.
Mike