Actually we can time a cold engine but... You need to pull the electronic timing advance wire off the top of the injection pump. Its the rear most wire and its the smaller spade connector. If you look closely at both wires on top of the pump you will see the different size connectors. this design is so we do not mix up the wires. Both will start the engine but using the advance wire feed on the front shutoff connector will not work once the engine is warmed up. The fast idel and electric advance are shut off when the engine is warmed up my the sender found behind the thermostat housing.