What is the valid consequence of a defective harmonic balancer?

A defective harmonic balancer can lead to inaccurate ignition timing readings, primarily because it plays a critical role in maintaining the alignment of the crankshaft and camshaft, as well as providing a reference point for timing. When the harmonic balancer is not functioning correctly, it may cause excessive vibrations and can result in misalignment issues within the engine's timing components. These vibrations can throw off the timing belt or chain, leading to timing discrepancies that affect ignition.

Maintaining the correct ignition timing is essential for optimal engine performance. An incorrect timing can cause the engine to run poorly, exhibit reduced power, and even lead to potential engine damage over time. Thus, a defective harmonic balancer directly impacts ignition timing accuracy and can have significant repercussions for the engine's operation as a whole.