Ford E-350 Super Duty (1999-2016) Ignition Coil Boot and Spring Kit Guide
Fixing a rough idle or misfire on your Ford van might be simpler and cheaper than you think.
- A cracked or leaking coil boot is a very common cause of misfires on Ford's 5.4L and 6.8L Triton engines.
- Symptoms often include a shudder around 45-50 MPH, a rough idle, and a check engine light with P030X codes.
- Replacing just the boots and springs is a cost-effective repair if the coils are still good.
- Always use dielectric grease inside the new boots to seal out moisture and ensure a good connection.
Is Your E-350 Super Duty Misfiring? It Might Be the Coil Boots.
If you're experiencing a rough idle, engine hesitation, or a shudder when accelerating (especially around 45-50 MPH in overdrive 🎬 Watch this video to see why your Ford shakes at speed.), a failing ignition coil boot is a likely culprit. These symptoms are often caused by the rubber boot drying out, cracking from engine heat, or allowing moisture to get into the spark plug tube. When this happens, the high-voltage spark from the coil can't reach the spark plug properly, leading to a misfire. This will almost always trigger the Check Engine Light.
Flashing Check Engine Light?
If your check engine light is flashing, it signals a severe misfire. Unburned fuel is being sent into the exhaust, which can quickly overheat and destroy your catalytic converters—a very expensive repair. Do not drive the vehicle if the check engine light is flashing.
Choosing the Right Aftermarket Coil Boot Kit
For a workhorse vehicle like the E-350, you don't have to buy the most expensive parts to get reliability. The original Motorcraft boots and coils are good quality, but the boots are a common failure point due to heat and age. Aftermarket kits are a cost-effective solution, especially since it's good practice to replace all the boots at once, or at least whenever you change your spark plugs.
Brand Quality: Denso vs. Standard Wires (Standard Motor Products)
- Denso: Denso is a well-respected brand and is often the original equipment manufacturer (OEM) for many car parts, including for Ford. Choosing Denso is as close to an OEM part as you can get, and they are known for quality and reliability.
- Standard Wires (Standard Motor Products/SMP): SMP is a long-standing aftermarket brand with a generally solid reputation. They offer parts that meet or exceed original specifications and are a reliable choice for daily drivers and work vehicles. Some users have reported mixed results with their coil products in recent years on other vehicle makes, but they remain a major supplier in the aftermarket. 🎬 Learn which aftermarket ignition coils you should avoid.
Pro Tip: When replacing the boots, it's highly recommended to replace the spark plugs at the same time if they are due. Also, apply a small amount of dielectric grease to the inside of the new boot. This helps seal out moisture, prevents the boot from getting stuck to the spark plug, and ensures a good electrical connection.
Aftermarket Direct Ignition Coil Boot Kit Cost (1999-2016 Ford E-350 Super Duty)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Coil Boot Kit (Set of 8 or 10) | $54.00 - $73.94 |
| Shop Labor to Install | $70 - $143 |
Note: Costs are estimates and can vary based on your location and specific service center. The labor cost is based on replacing the full ignition coils, but replacing just the boots is a very similar procedure.
Frequently Asked Questions (FAQ)
Do I have to replace the whole ignition coil or can I just replace the boot?
If the coil itself is not damaged, you can absolutely replace just the boot and spring. This is a common and cost-effective repair. Misfires on these Ford engines are frequently caused by a bad boot or moisture in the spark plug well, not a failed coil.
Should I replace all the coil boots at once?
Yes, it's highly recommended. The rubber on all the boots is the same age and has been exposed to the same conditions. If one has failed, others are likely to fail soon. Replacing them all at once saves you from future repeat repairs.
How do I know which cylinder is misfiring?
A Check Engine Light will store a Diagnostic Trouble Code (DTC). You can use an OBD-II scanner to read the code. A code like P0304 indicates a misfire on cylinder #4. A P0300 code means random or multiple cylinders are misfiring.
Is this a difficult job to do myself?
For most E-350 models, the job is straightforward but can be time-consuming due to tight access. The engine cover (or "doghouse") inside the van needs to be removed to access the rear cylinders. The front cylinders can sometimes be reached from under the hood. The only tool typically needed is a 7mm socket with an extension.
🎬 See how to replace ignition coil boots on your E-350.Are there any recalls for this issue?
Searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any specific recalls for ignition coil boots or ignition coils on the 1999-2016 Ford E-350 Super Duty. There was a Technical Service Bulletin (TSB 13-4-17) for other Ford models with similar engines that could experience coil damage due to a PCM issue, but it does not specifically list the E-350.
Helpful Videos
Technical Specifications
OEM Part Numbers: DG-508 DG-511
Kit includes rubber boots and internal contact springs for Coil-On-Plug ignition coils. Made from high-temperature silicone to resist engine heat and prevent voltage leaks.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford E-350 Super Duty: