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    1998 Chevrolet Truck Blazer 4WD 4.3L SFI 6cyl

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    Crankshaft Position Sensor

    Inspect/Test/Service/Replace

    • The sensor is mounted in a fixed position in the engine block. The tip of the sensor protrudes into the crankcase at a distance of 0.05 plus or minus 0.02 inch from the crankshaft.
    • A crankshaft adjusting tool may be used to check these rings.
      • Place the tool on the pulley extension surface and rotate the tool around the pulley.
      • If any blade touches the tool, replace the pulley.
    • Inspect the trigger wheel behind the crankshaft pulley and the sensor for damage.
    • If the engine misfires all the time or on acceleration only, test the following components:
      • Engine compression.
      • Spark plugs.
      • Spark plug wires.
      • Ignition coils test for firing voltage with a test spark plug.
      • Crankshaft sensor.
      • Fuel injectors on multiport and sequential fuel injection systems.

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