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    1954 GMC Truck PM250 Van 4.1L 1BL 6cyl

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    Oxygen Sensor

    Test/Replace

    • The sensor is threaded into the exhaust manifold.
    • It can be difficult to remove unless a special anti-seize compound is coated onto its threads.
    • Torque the sensor to 30 foot-pounds using a special socket.
    • A sensor that is too loose or a cracked exhaust manifold can result in a lean signal to the computer.
    • Check the vents in the thimble of a replacement O2 sensor.
    • There should be the same number of holes and they should face clockwise or counterclockwise like the ones on the original sensor.
    • Installing the wrong sensor can result in slower cross counts.

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