Checking spark plugs

Fig 1: Identifying Ignition Off Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.
• Remove all spark plugs.

  Check the spark plugs for cracks in the porcelain, the spark gap and for carbon and other deposits. If uncertain - replace the spark plugs.

  Fig 2: Identifying Spark Plug

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Replacing component 

• NO 

  Refer to Checking the fuel injection system and components