EBPV valve
 

I have been having a small prob with my 01 psd the exhaust valve wants to start closing when im driving it on cold days before it warms up fully its very annoying when it does it and while its idleing it kicks on and does not want to always kick off when i get in to drive have to let it idle for longer before it will kick off i would not mind unpluging it but not sure what i need to unplug any ideas?

Check out this thread, it has a pic of the plug in. https://www.ford-trucks.com/forums/s...t=Quikkordead+

Might also consider mounting a switch on the dash and splicing it into one wire on the plug, this would allow you to turn it off when you didn't want it. Of course, if it doesn't get too cold there, you probably don't need it at all.

Max