Ford E-350 Super Duty power issue due to two faulty coil packs and spark plugs, suspected factory defect on Ford E-350 Super Duty

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Ford E-350 Super Duty owners report experiencing power issues due to faulty coil packs and spark plugs, which can lead to suboptimal engine performance. These owners have noted problems with spark plugs becoming dislodged from the cylinder heads, causing significant engine complications. Additionally, ignition coils and coil boots may result in rough engine operation, misfiring during acceleration, and the illumination of the Check Engine Light. In some instances, the rubber boot insulating the coil to the spark plug can dry out and crack, leading to arcing issues. It is essential for owners to have these components inspected and replaced by certified mechanics to prevent further damage and ensure proper acceleration and engine performance. Addressing these concerns promptly can help mitigate potential safety hazards while driving.

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