Checking compression: Notes

• Ignition off.
• Disconnect the engine speed (RPM) sensor.
• Disconnect the camshaft position (CMP) sensor.
• Remove spark plug.
  • Carry out a compression test at wide open throttle (WOT) and turn the starter motor.

    Normal value 1.3 - 1.5 MPa (13 - 15 kp/cm² ) with engine at operating temperature

  Fig 3: Compression Testing

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is compression OK? 

• YES 

  FAULT NOT FOUND:  Troubleshooting has been completed.

• NO 

  Refer to Engine repairs