What is a primary cause of a clunking noise when accelerating from a stop?

A primary cause of a clunking noise when accelerating from a stop is often related to loose drive axle bolts. When these bolts are not sufficiently tightened, there can be movement or play in the drive axle assembly. This movement can create a clunking or popping sound as the drive axle engages and transmits power from the engine to the wheels. Since the drivetrain is under stress during acceleration, any looseness in the connection points can result in noticeable noises.

In contrast, while defective engine mounts can also contribute to abnormal noises or vibrations, they usually manifest in a different context, such as during shifts in the engine's position or when under load. Exhaust system leaks typically produce a hissing or rumbling noise rather than a clunk, and low power steering fluid is more likely to lead to whining sounds or difficulty in steering rather than a clunking noise during acceleration. Hence, loose drive axle bolts are the most direct and relevant cause of a clunking sound in this scenario.