After the PCM resolves a knock issue, it commands __________ in small increments.

After the PCM resolves a knock issue, it commands __________ in small increments.

• A. Timing retard
• B. Idle
• C. Fuel enrichment
• D. Timing advance

Answer: (D)

The main idea is how the PCM uses the knock sensor to adjust ignition timing. When detonation is detected, the PCM retards the timing to lower cylinder pressure and prevent knock. Once the knock condition is resolved and the engine can safely run, it gradually returns toward normal power by advancing timing in small increments. This slow, controlled lift prevents reintroducing knock while reclaiming optimal performance. So the best choice is timing advance. Timing retard would keep the engine running with less timing, which isn’t the goal after the issue is resolved. Idle adjustments and fuel enrichment aren’t about restoring ignition timing after knock.

The main idea is how the PCM uses the knock sensor to adjust ignition timing. When detonation is detected, the PCM retards the timing to lower cylinder pressure and prevent knock. Once the knock condition is resolved and the engine can safely run, it gradually returns toward normal power by advancing timing in small increments. This slow, controlled lift prevents reintroducing knock while reclaiming optimal performance.

So the best choice is timing advance. Timing retard would keep the engine running with less timing, which isn’t the goal after the issue is resolved. Idle adjustments and fuel enrichment aren’t about restoring ignition timing after knock.