This approach demands meticulous attention to detail and testing is strongly recommended. A carbon monoxide meter should be used for testing. The meter should be placed on the front seat. The car should then be run using the planned setup. The meter can be watched safely from outside the car. The meter reading will soon show if the system will work. If the meter moves quickly off-scale (>500ppm), the method is unlikely to fail. If the meter struggles to rise, even when the motor is started cold and allowed to idle, the system should be avoided.
In addition, careful planning is required to avoid the possibility of intervention. A car running with a hose fed into the back window will almost certainly attract attention. And, even if effective, sitting in an environment of hot, foul smelling, burnt engine waste, just to make use of the tiny percentage of monoxide present, is an unpleasant way to die. In Exit’s research of our elderly members’ attitudes, only a small number showed interest in using exhaust carbon monoxide.