ASE A8 Engine Performance Practice Test

Diagram of an automotive engine control system.

7. The engine in the diagram above contains:

  • A. A (COP) coil over plug ignition system.
  • B. A waste spark ignition system.
  • C. An electronic sequential port fuel injection system.
  • D. A (TBI) throttle body fuel injection system.

7.

Answer A is wrong. This is a waste spark ignition system that fires two cylinders at once. One of these cylinders is on its exhaust stroke. That's why its called a waste spark ignition system. One of the sparkplugs firing is "wasted" on the inert exhaust gases.

Answer B is correct. This diagram contains of a waste spark ignition system.

Answer C is wrong. This is a multiport fuel injection system. The PCM actuates two injectors at once. A sequential port fuel injection system is more precise, actuating one injector at a time for more precise fuel control.

Answer D is wrong. This diagram contains a multiport fuel injection system.