Checking the spark plugs

• Remove all spark plugs, note which cylinder each spark plug was removed from.
  Fig 1: Identifying Spark Plug

  Courtesy of VOLVO CARS OF NORTH AMERICA.

  Check the color of the spark plug

  Other information: 

  • To remove the spark plugs, see Replacing spark plugs .

Is any spark plug lighter than the others? 

• YES 

  Refer to Replacing the component 

• NO 

  OKAY:  Troubleshooting has been completed.