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.
Engine Light. If the crankshaft position sensor is going bad, the âCheck engineâ light may come on. Depending on the vehicle, a faulty crank position sensor could also result in error codes near the tachometer when the key is turned to the âOnâ position three times.