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.
Two obvious reasons come to mind. 1. The alternator fails. The battery voltage drops below 7 volts and the ignition system simply quits. 2. The crankshaft position sensor fails and neglects to send the signal needed to time your fuel injectors. Your ignition fails. Ford called thus signal a PIP, but all cars work on the same principle.