A backpressure reading above the recommended limit may impact which of the following?

A backpressure reading above the recommended limit primarily affects fuel injection efficiency. Backpressure is the pressure created in the exhaust system as exhaust gases exit the engine. When backpressure is too high, it can restrict the flow of exhaust, leading to incomplete combustion and affecting how fuel is injected into the combustion chamber. This can result in a richer fuel mixture, where too much fuel is injected relative to the amount of air, causing poor fuel atomization and combustion efficiency.

As a consequence, the engine may experience reduced power output, increased emissions, and potential fuel economy deterioration, all of which highlight the importance of maintaining optimal backpressure levels for efficient fuel injection. Proper exhaust flow is essential for achieving the best possible performance from both the engine and the fuel injection system.