What is a common indicator of restricted exhaust flow in a vehicle?

A common indicator of restricted exhaust flow in a vehicle is poor acceleration. When the exhaust system is obstructed, it prevents exhaust gases from flowing freely out of the engine, creating back pressure that hinders engine performance. This back pressure can lead to a buildup of exhaust gases in the combustion chamber, which diminishes the engine’s ability to take in fresh air and fuel for combustion. As a result, the vehicle may experience sluggishness and reduced power during acceleration, demonstrating a direct correlation between restricted exhaust flow and engine performance.

While the other options may indicate various issues in a vehicle, they do not specifically point to restricted exhaust flow. Frequent oil changes needed may suggest oil consumption issues or leaks, high coolant temperature signals potential cooling system problems, and increased tire wear is usually connected to alignment or suspension issues. Therefore, none of these options directly relate to the effects of an obstructed exhaust system as clearly as poor acceleration does.