I have no buzzing from my frequency valve...strange how well the car runs? I can't get a reading at all of duty cycle with frequency valve plugged in-unplugged, I get about 38-42%. I'm not sure what that is saying, but next to check for a bad OVP...thanks Steve and Warren...I tested with O2 unplugged.
Would anyone know WHERE the OVP might be hiding on the 1980 450SEL? I assume I'm looking for something with a fuse on it? Perhaps it is tucked in the passenger footwell?
Edited to say that I found it, and it was in the passenger footwell behind the small vented cover that pops off. It looks quite old. Most other relays had been replaced after the jumpstarting. I think they missed this one.
Edited again to say that I popped the red cover off of the OVP and found the thin wire connecting two pins was broken/melted.
Last edited by '79 Super Turtle; 12-30-2003 at 11:15 PM.