Kent-Moore Tools
Kent-Moore J-35314-A Exhaust Back Pressure Tester

For General Motors. Used to measure exhaust backpressure at the oxygen sensor port. Features a 0-15 psi gauge, hose and sensor port fitting. With the gauge attached and the engine running at approx. 2500 rpm, the gauge indicator should be in the green range indicating that exhaust backpressure is not excessive. If the pressure exceeds 1.25 psi (8.62kPa), the exhaust system may be restricted. Refer to the appropriate service manual for further repair procedures.