What tool is typically used to measure backpressure in the exhaust system during a catalytic converter test?

A pressure gauge is the typical tool used to measure backpressure in the exhaust system during a catalytic converter test. Backpressure is the resistance that the exhaust gases face as they exit the engine and travel through the exhaust system, including the catalytic converter. Measuring this backpressure is essential because excessive backpressure can indicate issues such as a clogged catalyst or exhaust restrictions, which can affect engine performance and emissions.

A pressure gauge provides a direct measurement of the pressure within the exhaust system, allowing technicians to diagnose potential problems related to backpressure effectively. Other tools mentioned in the choices have different functions; for example, a vacuum gauge measures the vacuum in the intake manifold, a digital multimeter is used for electrical diagnostics, and an exhaust gas analyzer is focused on measuring the composition of the exhaust gases rather than the pressure within the exhaust system itself. Thus, the pressure gauge is specifically tailored for the task of assessing backpressure.