Worn spark plug wires may develop micro cracks in insulation on Mercedes-Benz ML350

Problem Description and Possible Solution

As the spark plug wires age and are exposed to heat cycling, they start to develop micro cracks in the insulation around the resistors, which causes misfires and poor fuel economy.

Problem Data
RepairPal Verified
Average mileage: (–)
4 model years affected: 2003, 2004, 2005, 2009
4 people reported this problem