Which limiter limits the spark and then the fuel?

• A. Spark Rev Limiter
• B. Fuel Rev Limiter
• C. Stage Rev Limiter
• D. Open Loop

Answer: (A)

When protecting an engine from over-revving, the system first targets the spark. A spark rev limiter stops or interrupts ignition, keeping RPM in check by preventing the spark from firing at high engine speeds. If the RPM continues to climb, some systems then apply a fuel limiter to cut fuel and further limit RPM. This two-step behavior—ignition cut first, then fuel cut—matches the description in the question.

A fuel rev limiter would cut fuel without specifically limiting the spark. A stage rev limiter involves staged power reductions rather than a primary ignition/fuel sequence, and open loop is a broader control mode, not a limiter that acts on spark or fuel.