Definition of quantal. 1  1 [Latin quanti how many, plural of quantus] : of, relating to, or having only two experimental alternatives (such as dead or alive, all or none) 2  2 [quantum] : of or relating to a quantum.
3. Engine movement. Another symptom of bad or failing engine mounts is an engine that moves in the engine bay. If the engine mounts are in good condition, they should be able to secure the engine firmly in the engine bay.
Charging Problems. The first sign of trouble when an alternator is failing is a low or dead battery. On a late-model vehicle, that can not only cause a no-start but also can cause the loss of âlearnedâ data in the powertrain control module and other modules throughout the vehicle.