Ford E-350 Econoline (1997-2008) Ignition Coil Boot Kit Reference
Resolving misfires and rough idling in your Ford van often begins with these essential, yet simple, parts.
- Bad coil boots are a very common cause of misfires on Ford Triton engines; symptoms include shaking, a flashing check engine light, and power loss.
- Accessing the rear cylinders on an E-350 requires removing the interior engine "doghouse" and can be very difficult due to tight spaces.
- Always replace coil boots as a set when changing spark plugs to prevent future failures and ensure a good seal.
- Before installation, clean the spark plug wells of any debris or oil and apply dielectric grease inside the new boots.
Symptoms of a Failing Ignition Coil Boot
When a coil boot fails on your E-350, the symptoms are often mistaken for a bad ignition coil or even a transmission problem. The rubber degrades from constant engine heat, cracking and losing its ability to insulate. Oil leaks from the valve cover gaskets can also saturate the boots, and moisture can get trapped, causing the spark to short. Look for these signs:
- Engine Misfires: The engine will shake, stumble, or run rough, especially under load, like when going up a hill. This is the most common symptom.
- Check Engine Light: A misfire will trigger the check engine light. You will see codes like P0300 (random misfire) or P0301-P0310, indicating which cylinder is failing to fire.
- Poor Fuel Economy: An engine that isn't firing on all cylinders wastes fuel.
- Loss of Power: Your van will feel sluggish and have trouble accelerating.
A Word on E-350 Engine Access
Unlike a pickup truck, the engine in your E-350 van is accessed from inside the cabin by removing the engine cover, often called the "doghouse" 🎬 Watch this video to see how to remove the doghouse.. While this provides good access to the rear of the engine, it's a confined space. Replacing boots on the rearmost cylinders is significantly more difficult than the front ones. Be prepared for a tight squeeze and to work by feel at times.
Choosing the Right Aftermarket Coil Boot Kit
For the 1997-2008 E-350, the original equipment (OEM) brand is Motorcraft. While OEM is a reliable choice, high-quality aftermarket brands can offer equivalent performance and better value.
- Premium Aftermarket (Denso): Denso is a well-respected OEM supplier for many automakers and has a strong reputation in the aftermarket. Their products are known for high-quality materials and reliable performance, making them a top-tier choice that often meets or exceeds original specifications.
- Standard Aftermarket (Standard Motor Products): Standard is a long-standing brand offering reliable replacement parts. They provide a good balance of quality and affordability, making them a solid choice for most repairs. Their boots are designed to resist heat and chemical deterioration.
It is highly recommended to replace all the coil boots at the same time you replace the spark plugs. This ensures a fresh, reliable seal and prevents a phenomenon called "carbon tracking," where an old boot can cause a new spark plug to fail prematurely.
Pro Tip: Before installing new boots, use compressed air to blow any dirt or debris out of the spark plug wells. Also, inspect the wells for oil or coolant, which indicates a separate leak (like a valve cover gasket) that must be fixed. Applying a small amount of dielectric grease to the inside of the boot will help seal out moisture and make future removal easier.
🎬 See a step-by-step guide on replacing your ignition coil boots.| Item | Typical Cost |
|---|---|
| New Aftermarket Kit (8 or 10 boots) | $54.00 - $74.00 |
| New OEM Kit (Motorcraft, boots only) | $80 - $120 |
| Shop Labor | $150 - $400+ |
Note: Labor costs can vary significantly based on engine size (V8 vs. V10) and which cylinders need service due to the difficult access on E-Series vans.
Frequently Asked Questions
Do I have to replace the whole ignition coil if only the boot is bad?
Not necessarily. If the coil itself is functioning, you can replace just the boot and spring. However, if the spark plug well was full of oil or water, or if the coil shows signs of corrosion or burn marks, it's wise to replace the entire coil assembly.
Why is my engine still misfiring after replacing the boots and plugs?
First, double-check that all electrical connectors are securely clipped onto the coils. If the problem persists, the issue could be a faulty new part, a bad ignition coil, a clogged fuel injector, or a break in the wiring harness. It's best to swap the new coil/boot from the misfiring cylinder to a known good cylinder and see if the misfire code follows the part.
🎬 Learn how to diagnose a misfire on a V-10 engine.Are there any recalls for this issue?
There are no specific NHTSA recalls for ignition coil boots or ignition coils on the 1997-2008 Ford E-350. There were several unrelated recalls for this vehicle, including for the speed control deactivation switch.
Why is it important to use dielectric grease?
Dielectric grease is a non-conductive silicone paste that seals the boot to the spark plug porcelain and the coil housing. It prevents high-voltage electricity from escaping, seals out moisture and contaminants, and prevents the boot from getting stuck to the spark plug, making future service much easier.
Helpful Videos
![Ford Coil On Plug Misfire Diagnostics [E-350 V-10]](https://img.youtube.com/vi/fCfqGKw6EMg/mqdefault.jpg)
Technical Specifications
OEM Part Numbers: DG508
Kit includes rubber boots and internal contact springs. Designed for Coil-on-Plug (COP) ignition systems on Ford 5.4L V8 and 6.8L V10 Triton engines. Made from heat-resistant silicone to protect against high engine temperatures and oil/chemical exposure.
We Have This Part in Stock
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 Econoline: