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Exhaust System Backpressure (Using Pressure Gauge)

Remove Heated Oxygen Sensor (HO2S). Connect a 0-5 psi pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is more than 1 3/4 - 2 psi (.12-.14 kg/cm2 ), exhaust system or catalytic converter is plugged.

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