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Cylinder Compression Pressure (Using DRBIII(R))

  1. Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise the indicated compression pressures may not be valid for diagnosis purposes. Check engine oil level and add oil if necessary.
  2. Drive the vehicle until engine reaches normal operating temperature. Select a route free from traffic and other forms of congestion, observe all traffic laws, and accelerate through the gears several times briskly. Disconnect and remove all ignition coils from spark plugs. Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnormal firing indicators fouled, hot, oily, etc.
  3. Record cylinder number of spark plug for future reference. Remove the Auto Shutdown (ASD) relay from the Power Distribution Center (PDC). See Figure . PDC is located in engine compartment. See Figure .
  4. Be sure throttle blade is fully open during the compression check. Insert Compression Gauge Adapter (8116) or equivalent into the No. 1 spark plug hole in cylinder head. Connect the 0-500 psi (Blue) Pressure Transducer (CH7059) with cable adapters to the DRBIII(R). Crank engine until maximum pressure is reached on gauge. Record this pressure as No. 1 cylinder pressure. Repeat the previous step for all remaining cylinders.
  5. See COMPRESSION SPECIFICATIONS  table for correct engine compression pressures. If one or more cylinders have abnormally low compression pressures, repeat the compression test. If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it could indicate the existence of a problem in the cylinder in question.
  6. The recommended compression pressures are to be used only as a guide to diagnosing engine problems. An engine should not be disassembled to determine the cause of low compression unless some malfunction is present.
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