Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 4
   
   Depending on the cause of the misfire, the Misfire History Cyl # counter will display a very large number for the misfiring cylinders. Values for the non-misfiring cylinders will be less than 1/2 as great as the misfiring cylinders. When investigating a misfire, always start with items associated with the cylinder that has the largest number of counts stored in the Misfire History Cyl # counter.
2. 5
   
   If the misfiring cylinders are companion cylinders, the condition is most likely linked to the ignition system.