WIll you guys tell me what I need to do to my sweet little VOlvo. I drive and drive it and never work on it till it starts acting up. I want to do better by her and give her the much needed attention she needs. Bob says I need to re-solder the master relay and he list a couple of other things to check. What I didnt ask Bob about is a wire that comes up from the back of the motor to a little plastic module on the rocker cover. There seems to be a sensor on the flywheel housing that the wire comes from. What is this?