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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 53 (Engine - 4.7L) >> Engine 4.7L >> Diagnosis And Testing >> Diagnosis And Testing-Cylinder Compression Pressure

Diagnosis And Testing-Cylinder Compression Pressure

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.

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.

  1. Clean the spark plug recesses with compressed air.
  2. Remove the spark plugs.
  3. Secure the throttle in the wide-open position.
  4. Disable the fuel system (Refer to FUEL SYSTEM PRESSURE RELEASE ).
  5. Remove the ASD relay (Refer to A/C RELAY, AUTO SHUTDOWN RELAY, FUEL PUMP RELAY, STARTER RELAY & TRANSMISSION RELAY ).
  6. Insert a compression pressure gauge and rotate the engine with the engine starter motor for three revolutions.
  7. Record the compression pressure on the 3rd revolution. Continue the test for the remaining cylinders.
  8. (Refer to ENGINE-SPECIFICATIONS ) for the correct engine compression pressures.
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