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Exhaust System Backpressure (Using Pressure Gauge)

Remove Oxygen Sensor (O2S) or air injection check valve (if equipped). Connect a 0-5 psi pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 1 3/4 - 2 psi (.12-.14 kg/cm² ), exhaust system or catalytic converter is plugged.