Take a wire brush to the lug and the surface.
Put the star washer between the bolt head and the lug, not between the lug and the surface.
On a thread related note I spent the good part of 3 (back crunching) hours today locating and cleaning grounds. Preliminary results are good but I will wait a week or two before I say yes for sure and upload some more pics.
Spent about 3 hours the other day and finally got these high temps under control! I still can make them fluctuate with turning on/off accessories but only by a few degrees and not 20 like before.
I ended up adding star washers to the following grounds as well as sanding the lug and area the lug attached to. (didn't sand the heads just cleaned them)
Drivers side head rear.
Passenger side head (both rear not pictured and the side facing the fender/battery pictured)
The ground below the underhood fuse box.
The first rule in ASIC design: GROUND IS NOT GROUND
What a great tribute to the Forums! Thank you to all for this information, i will be implementing it soon...I'm curious has anyone noticed that on a cold cold day, (key on, no start) the oil temp can be quite a bit below the actual or forcasted ambient temp? I wonder if this is related or just a weird attribute of oil? I'm in Texas, so I have only seen it on a rare morning here...
A sump full of cold oil will warm slowly as the ambient temperature rises (so the oil temp will lag behind the air temp), but I've seen my oil temp indicating 3 or 4F lower than the air temp ever got. That's not a weird attribute of oil, that's just error in the indications.
You'd get a better feel for accuracy by comparing oil temp to coolant temp right at startup.
Check this thread for reference: http://www.cadillacforums.com/forums...connector.html
I noticed the plug was loose during my clutch install. Slid it back in, but with all the work going on I forgot to secure it . Anyways, my oil temp has not gone above 210 (usually around 235 with light driving) and I'm up at least .5V.