Car Problem Reports

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

 
Mercedes-Benz ML350 Problem
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Model Years Affected: 2003, 2004, 2005, 2009

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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.

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