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.
The failure of a camshaft position sensor could leave you stranded on the side of the road waiting for the tow truck. The engine still may run poorly, Either way find a good mechanic, one who specializes in engine performance, and set an appointment - the sooner the better.