QUOTE(realred914 @ Apr 7 2010, 09:57 PM)
dead short wont hurt the brain, but you will be much too lean, maybe not even be able to run
You know, I'm going to test this, but perhaps not. Once the engine is fully warmed up, when the value of the CHT drops below about 300 ohms, the ECU cylinder temperature compensation circuit doesn't lean out the mixture any more. In theory, you should be able to ground it and there would be no impact on the mixture. In practice, I know that on a warmed up motor, the CHT is at about 50 ohms. I'll try this on my bench simulator and see if it works. See:
http://members.rennlist.com/pbanders/ecu.htm#CTCWhere you'll definitely be too lean is when the motor is cold, and you're trying to start it, if you have the CHT grounded. May not even start.