Thread found and below is the resolution:
Well I'm not jumping for joy just yet. I'll give it a few more days of cold start before I call it good. I started thinking about temp either engine temp or ambient temp outside since it started fine when it was parked inside overnight in a 65* building. I was wondering if the oil temp reading low was a safety to keep the injectors from firing so you couldnot do harm to the engine. Anyways, my ficm relay and eot sensor finally came in yesterday. I turned the truck on last night and it was about 34* outside. No buzz no start. Then I replaced the ficm relay... no buzz no start. I then headed over to the other side of the engine age changed the eot sensor. Turned the key.... the injectors buzzed as usual and the truck fired right up. I started it 3 more times since then with it being cold and all is good so far. So whatever my problem was must have been a safety in that sensor to deal with temperature. Also my fan had been engaged during this whole problem and is off now. I assumed that was because of the sensor all along but I didn't understand why the fan would come on if the engine was too cold.
Anyways, I think I have this one nailed but I'm going to give it a few more starts before I feel confident. Thanks for all the help guys!
What the OP of this thread thought is that the P0197 code meant a low temperature default. In fact it meant the opposite - a defaulted high temperature as suggested by the Tech. Temperature sensors are thermistors. Low input means high temperature, ie P0197 defaults to 212*F.
Post #27 in:
6.0L Power Stroke Diesel - no injector buzz no start. where should I start? - Hey guys, I have a 2004 6.0 that was running fine and starting fine until the other day it wont start cold. Truck turns over but no start. I noticed today though that there is no injector buzz. If I give it a quick...