Strange occurrence/ shutdown with my MCI9

[RickB]

Hey all,

Last night we took the bus on a shakedown cruise after my cooling system rebuild and after about 75 miles to the drive in for burgers and back, I am backing into the driveway and there is a bit of a bump that tells me when I get to the right spot, well I feel the bump and the motor quits. I mean it was perfectly timed. It was like I had done it only I hadn't. I tried to get it to refire a few times and it would start for a couple seconds and then die. I took a second to get my bearings and then I noticed my high temp light was dimly lit, I looked at the temp gauge and it was full HOT (270 degress or something) well I ran back to the back to check my mechanical temp gauge and it was at 150 degrees, I had just checked the temp a couple minutes before this mysterious shutdown and it had been fine so I had my doubts before I read that. Well, lo and behold I go to the front of the bus and the temp is back to normal on the gauge and she fires right up. My thought is that bump in my driveway exposed a short somewhere in my high temp shutdown. Sound reasonable to you folks?
Electrical issues are not my friend. I don't really know the fundamentals of electrical or how to troubleshoot it.

Thanks,
Rick

[buswarrior]

Sounds plausible to me.

The sensors work by grounding. Trace out the wires from sensor back to the panel. Look to see what shape they are in, ratty, rubbing, stiff, broken and waving in the air....?

All it had to do was give a little rub against something metal, and voila, your symptoms.

Anything in the panel that could move or otherwise touch if it was given a little bump?

happy coaching!
buswarrior

[gumpy]

Sounds like you forgot to connect your tempstat wire when you put your cooling system back together, and the wire shorted to ground when you hit the bump. Then when you checked with your IR gun, you moved it with your hand or arm.

The good news is your safety shutdown system is working properly. Had this been a real emergency, your engine might have been saved.