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.
Insufficient burning inside the engine will make the car hesitates or jerks when driving. This could happen during acceleration, driving downhill, or gear change. Generally, it is not a serious problem but it is very exasperating when the car doesnât go although you step on the gas pedal heavily.