От чего Рено Логан на холодную заводится и сразу глохнет?

The engine starts instantly, the tachometer needle suddenly reaches 1,500-2,000 rpm and smoothly drops to 500 rpm. Then the unit chokes and stalls. Experts, when they see a car with such a breakdown, immediately disconnect the power supply to the coolant temperature sensor. It helps, but does not indicate a defective sensor. If there are no problems when hot, then it is worth replacing. Otherwise, replacing rarely helps.