Originally Posted by
NckT
It will read 54 intil the coolant temperature reaches 80c. The lambda switch (temp switch) ilocated on tje V casting under the inlet manifold is ON until the temperature is above 80c, then the switch will go OFF. This lambda switch is wired in parallel with the full load wide open thrortle (WOT) switch, so if the WOT switch is unplugged yet the engine is not hot enough, you'll get 54.
Once the engine coolant temp is above 80c then week the fuel comport use the oxygen sensor as the reference signal and adjust the dwell accordingly to the current fuel mixture