Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Won't start when it is warm or hot outside › Reply To: Won't start when it is warm or hot outside March 16, 2021 at 6:44 pm #989462 Richard KirshyParticipant I would start with checking voltages on the wiring of the start circuit of the ignition side when it fails to start. Also inspect and check powers and grounds going to and from the ECM.