Who is correct about the need to accelerate the engine when checking ignition timing?

In this context, the focus is on the procedure for checking ignition timing, which may involve different techniques depending on the engine type and diagnostic requirements.

Technician B is correct as they emphasize the need to accelerate the engine when checking the ignition timing under certain conditions. This is often necessary because many modern engines utilize electronic ignition systems where the timing can vary with engine speed and load. By accelerating the engine during the timing check, it ensures that the timing is observed at various RPMs and load conditions to confirm that the ignition timing is functioning correctly throughout the range of operation.

Technician A may not acknowledge the importance of this step, which could lead to an incomplete or inaccurate assessment of the ignition timing, particularly in systems where timing could advance or retard based on vehicle operation parameters.

Thus, the reason Technician B's approach is deemed correct is the practical and necessary consideration of engine behavior under different operational conditions when diagnosing ignition timing.